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Hunting RUG PULLs in Binance Smart Chain by code reviewing

An example of the importance of auditing smart contracts. A rug pull example found in Binance Smart Chain (BSC). The POKELON case

Table of Content

What is a rug pull?

We could define a rug pull as:

“Rug pulls are a lucrative scam in which a crypto developer promotes a new project—usually a new token—to investors, and then disappears with tens of millions or even hundreds of millions of dollars.”

Introducing POKELON: another scam

According to creator description:

$POKELON is a BEP20 token that parodies wildly popular trends in DeFi and Gaming culture and brings them to life as an interactive, NFT Collectible Card Game. Just like the series our project parodies, holders have access to a wide variety of NFTs and can trade and battle their NFTs in the Telegram based battling game Pokelon League. Packed with more features than any token on the market, ready on launch day. Some of our features are:

  • Fully decentralized dex using PCS routers
  • Token staking with 3 pools up to 200% APY
  • Liquidity pool farming with 4000% APY!!
  • Our own liquidity swap page
  • Native NFT Marketplace
  • Native NFT Farm where you can stake tokens, earn points and use those points to claim NFTs
  • NFT Staking

POKELON view on CoinmarketCap.com
POKELON view on CoinmarketCap.com

Taking a look at contract code.

First, we need to find contract address. Easiest way is, to check Coinmarketcap provided information. There, we see the address is 0x4945c9E9dF719ad0602a10F4064e71326e5628f0 so we either can use web3 to download the bytecode and try to decompile it to some extent, or either visit Etherscan and see if we are lucky and source code is available.

In this case, code is available, as seen in following screenshot.

POKELON contract code in BSC Explorer
POKELON contract code in BSC Explorer

Making a code review

For reference, I paste the contract code below.

POKELON contract code

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/**
 *Submitted for verification at BscScan.com on 2022-03-03
*/

/**
PPPPPPPPPPPPPPPPP        OOOOOOOOO     KKKKKKKKK    KKKKKKKEEEEEEEEEEEEEEEEEEEEEELLLLLLLLLLL                  OOOOOOOOO     NNNNNNNN        NNNNNNNN
P::::::::::::::::P     OO:::::::::OO   K:::::::K    K:::::KE::::::::::::::::::::EL:::::::::L                OO:::::::::OO   N:::::::N       N::::::N
P::::::PPPPPP:::::P  OO:::::::::::::OO K:::::::K    K:::::KE::::::::::::::::::::EL:::::::::L              OO:::::::::::::OO N::::::::N      N::::::N
PP:::::P     P:::::PO:::::::OOO:::::::OK:::::::K   K::::::KEE::::::EEEEEEEEE::::ELL:::::::LL             O:::::::OOO:::::::ON:::::::::N     N::::::N
  P::::P     P:::::PO::::::O   O::::::OKK::::::K  K:::::KKK  E:::::E       EEEEEE  L:::::L               O::::::O   O::::::ON::::::::::N    N::::::N
  P::::P     P:::::PO:::::O     O:::::O  K:::::K K:::::K     E:::::E               L:::::L               O:::::O     O:::::ON:::::::::::N   N::::::N
  P::::PPPPPP:::::P O:::::O     O:::::O  K::::::K:::::K      E::::::EEEEEEEEEE     L:::::L               O:::::O     O:::::ON:::::::N::::N  N::::::N
  P:::::::::::::PP  O:::::O     O:::::O  K:::::::::::K       E:::::::::::::::E     L:::::L               O:::::O     O:::::ON::::::N N::::N N::::::N
  P::::PPPPPPPPP    O:::::O     O:::::O  K:::::::::::K       E:::::::::::::::E     L:::::L               O:::::O     O:::::ON::::::N  N::::N:::::::N
  P::::P            O:::::O     O:::::O  K::::::K:::::K      E::::::EEEEEEEEEE     L:::::L               O:::::O     O:::::ON::::::N   N:::::::::::N
  P::::P            O:::::O     O:::::O  K:::::K K:::::K     E:::::E               L:::::L               O:::::O     O:::::ON::::::N    N::::::::::N
  P::::P            O::::::O   O::::::OKK::::::K  K:::::KKK  E:::::E       EEEEEE  L:::::L         LLLLLLO::::::O   O::::::ON::::::N     N:::::::::N
PP::::::PP          O:::::::OOO:::::::OK:::::::K   K::::::KEE::::::EEEEEEEE:::::ELL:::::::LLLLLLLLL:::::LO:::::::OOO:::::::ON::::::N      N::::::::N
P::::::::P           OO:::::::::::::OO K:::::::K    K:::::KE::::::::::::::::::::EL::::::::::::::::::::::L OO:::::::::::::OO N::::::N       N:::::::N
P::::::::P             OO:::::::::OO   K:::::::K    K:::::KE::::::::::::::::::::EL::::::::::::::::::::::L   OO:::::::::OO   N::::::N        N::::::N
PPPPPPPPPP               OOOOOOOOO     KKKKKKKKK    KKKKKKKEEEEEEEEEEEEEEEEEEEEEELLLLLLLLLLLLLLLLLLLLLLLL     OOOOOOOOO     NNNNNNNN         NNNNNNN

Join us now at https://t.me/projectpokelon
*/

// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.4;

abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}


interface IBEP20 {

    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
      
}

library SafeMath {

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }


    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

contract Ownable is Context {
    address private _owner;
    address private _previousOwner;
    uint256 private _lockTime;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }   
    
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
        
    }

    function getUnlockTime() public view returns (uint256) {
        return _lockTime;
    }
    
    function getTime() public view returns (uint256) {
        return block.timestamp;
    }

    function lock(uint256 time) public virtual onlyOwner {
        _previousOwner = _owner;
        _owner = address(0);
        _lockTime = block.timestamp + time;
        emit OwnershipTransferred(_owner, address(0));
    }
    
    function unlock() public virtual {
        require(_previousOwner == msg.sender, "You don't have permission to unlock");
        require(block.timestamp > _lockTime , "Contract is locked until 7 days");
        emit OwnershipTransferred(_owner, _previousOwner);
        _owner = _previousOwner;
    }
}

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
    
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

interface IUniswapV2Router {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
    
    
   function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

contract POKELON is Context, IBEP20, Ownable {
    
    using SafeMath for uint256;

    mapping (address => uint256) private _rOwned;
    mapping (address => uint256) private _tOwned;
    mapping (address => mapping (address => uint256)) private _allowances;

    mapping (address => bool) private _isExcludedFromFee;
    mapping (address => bool) isDividendExempt;
    mapping(address => bool) private _liquidityHolders;
    mapping(address => bool) private _isSniper;
    mapping(address => uint256) public dailySpent;
    mapping(address => uint256) public allowedTxAmount;
    mapping(address => uint256) public sellIntervalStart;

    mapping (address => bool) private _isExcluded;
    address[] private _excluded;
   
    uint256 private constant MAX = ~uint256(0);
    uint256 private _tTotal = 300 * 10**6 * 10**9;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));
    uint256 private _tFeeTotal;

    string private _name = "POKELON";
    string private _symbol = "POKELON";
    uint8 private _decimals = 9;
    
    uint256 public swapAndLiquifycount = 0;
    uint256 public snipersCaught = 0;

    
    uint256 public _taxFee = 1; //consists of reflect tax
    uint256 private _previousTaxFee = _taxFee;
    
    uint256 public _liquidityFee = 9; //consists of buyback + liq + dividends tax 
    uint256 private _previousLiquidityFee = _liquidityFee;
    
    
    uint256 public div1 = 3;
    uint256 public div2 = 33;


    uint256 public _startTimeForSwap;
    uint256 public _intervalSecondsForSwap = 1 * 30 seconds;

    // Fee per address

    uint256 public _maxWallet = 3 * 10**6 * 10**9;
    uint256 public _maxTxAmount = 3 * 10**5 * 10**9;
    uint256 private minimumTokensBeforeSwap = 1 * 10**4 * 10**9; 
    uint256 public launchedAt = 0;

    IUniswapV2Router public uniswapV2Router;
    address public uniswapV2Pair;
    
    bool inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = true;
    bool private sniperProtection = true;
    bool public _hasLiqBeenAdded = false;
    bool public _tradingEnabled = false;

    address public currentLiqPair;
    address payable public buybackAddress = payable(0x26FB5ED637aFDaFF5c6D68983700D1b4a64f7417);
    address payable public devAddress = payable(0x2536c8b471cDCE137dFc18e41Ad46BB7fbDB1BCF);
    address payable public lpAddress = payable(0xb5367a40DB52e8D396DA265919ab24f49D2259a9);
    address payable public stakingAddress = payable(0xDcA2A2e8f504d1cE05af81131c1562273372270e);

    
    event SwapAndLiquifyEnabledUpdated(bool enabled);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );
    
    event SwapTokensForETH(
        uint256 amountIn,
        address[] path
    );
    
    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }
    
    constructor () {
        transferOwnership(lpAddress);
        _rOwned[lpAddress] = _rTotal;
        
        // Pancake Router Testnet v1
        // IUniswapV2Router _uniswapV2Router = IUniswapV2Router(0x9Ac64Cc6e4415144C455BD8E4837Fea55603e5c3);
        
        // Pancakeswap Router Mainnet v2
        IUniswapV2Router _uniswapV2Router = IUniswapV2Router(0x10ED43C718714eb63d5aA57B78B54704E256024E);

        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());
        uniswapV2Router = _uniswapV2Router;
        
        _isExcludedFromFee[lpAddress] = true;
        _isExcludedFromFee[stakingAddress] = true;
        _isExcludedFromFee[address(0)];
        _isExcludedFromFee[devAddress] = true;
        _isExcludedFromFee[address(this)] = true;
        _liquidityHolders[lpAddress] = true;

        _startTimeForSwap = block.timestamp;
        
        emit Transfer(address(0), lpAddress, _tTotal);
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        if (_isExcluded[account]) return _tOwned[account];
        return tokenFromReflection(_rOwned[account]);
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    function isExcludedFromReward(address account) public view returns (bool) {
        return _isExcluded[account];
    }

    function totalFees() public view returns (uint256) {
        return _tFeeTotal;
    }
    
    function minimumTokensBeforeSwapAmount() public view returns (uint256) {
        return minimumTokensBeforeSwap;
    }
    
    
    function deliver(uint256 tAmount) public {
        address sender = _msgSender();
        require(!_isExcluded[sender], "Excluded addresses cannot call this function");
        (uint256 rAmount,,,,,) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rTotal = _rTotal.sub(rAmount);
        _tFeeTotal = _tFeeTotal.add(tAmount);
    }
  

    function reflectionFromToken(uint256 tAmount, bool deductTransferFee) public view returns(uint256) {
        require(tAmount <= _tTotal, "Amount must be less than supply");
        if (!deductTransferFee) {
            (uint256 rAmount,,,,,) = _getValues(tAmount);
            return rAmount;
        } else {
            (,uint256 rTransferAmount,,,,) = _getValues(tAmount);
            return rTransferAmount;
        }
    }

    function tokenFromReflection(uint256 rAmount) public view returns(uint256) {
        require(rAmount <= _rTotal, "Amount must be less than total reflections");
        uint256 currentRate =  _getRate();
        return rAmount.div(currentRate);
    }

    function excludeFromReward(address account) public onlyOwner() {

        require(!_isExcluded[account], "Account is already excluded");
        if(_rOwned[account] > 0) {
            _tOwned[account] = tokenFromReflection(_rOwned[account]);
        }
        _isExcluded[account] = true;
        _excluded.push(account);
    }

    function includeInReward(address account) external onlyOwner() {
        require(_isExcluded[account], "Account is not excluded");
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_excluded[i] == account) {
                _excluded[i] = _excluded[_excluded.length - 1];
                _tOwned[account] = 0;
                _isExcluded[account] = false;
                _excluded.pop();
                break;
            }
        }
    }

    function _approve(address owner, address spender, uint256 amount) private {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        if(!_isExcludedFromFee[from] && !_isExcludedFromFee[to]) {
            require(_tradingEnabled, 'Trading is currently disabled');
            require(to != address(0), "ERC20: transfer to the zero address");
            if(to != uniswapV2Pair){
                require(balanceOf(to).add(amount) <= _maxWallet, "Transfer exceeds max");
            }else{
                if(sellIntervalStart[from] != 0){
                    if(sellIntervalStart[from].add(120) < block.timestamp){
                        allowedTxAmount[from] = _maxTxAmount;
                        sellIntervalStart[from] = block.timestamp;
                    }
                }
                if(allowedTxAmount[from] == 0 && sellIntervalStart[from] == 0){
                    allowedTxAmount[from] = _maxTxAmount;
                    sellIntervalStart[from] = block.timestamp;
                }
                if(amount > allowedTxAmount[from]){
                    revert("MaxTx Limit: Daily Limit Reached");
                }else{
                    if(allowedTxAmount[from].sub(amount) <= 0){
                        allowedTxAmount[from] = 0;
                    }else{
                        allowedTxAmount[from] = allowedTxAmount[from].sub(amount); 
                    }
                }
            }
        }
        
        
            
        if(!_isExcludedFromFee[from] && !_isExcludedFromFee[to]) {
        }
        
        uint256 contractTokenBalance = balanceOf(address(this));

        bool overMinimumSwapTokenBalance = contractTokenBalance >= minimumTokensBeforeSwap;    

        // Handle liquidity and buybacks
        if (!inSwapAndLiquify && swapAndLiquifyEnabled && balanceOf(uniswapV2Pair) > 0 && !_isExcludedFromFee[from]) {
            if(to == uniswapV2Pair ){ 
                if (overMinimumSwapTokenBalance && _startTimeForSwap + _intervalSecondsForSwap <= block.timestamp) {
                    _startTimeForSwap = block.timestamp;
                    swapAndLiquifycount = swapAndLiquifycount.add(1);
                    swapAndLiquify(minimumTokensBeforeSwap);
                }  
            }
        }

        bool takeFee = true;
        
        // If any account belongs to _isExcludedFromFee account then remove the fee
        if(_isExcludedFromFee[from] || _isExcludedFromFee[to]){
            takeFee = false;
        }
        
        _tokenTransfer(from,to,amount,takeFee);
            
    }

    

    function swapAndLiquify(uint256 contractTokenBalance) internal lockTheSwap {
        // split the contract balance into halves
        uint256 whole = contractTokenBalance.div(div1);
        uint256 half = whole.div(2);
        uint256 otherHalf = whole.sub(half);
        uint256 remains =  contractTokenBalance.sub(whole);
        
        // capture the contract's current BNB balance.
        // this is so that we can capture exactly the amount of BNB that the
        // swap creates, and not make the liquidity event include any BNB that
        // has been manually sent to the contract
        uint256 initialBalance = address(this).balance;

        // swap tokens for BNB
        swapTokensForEth(half);

        // how much BNB did we just swap into?
        uint256 newBalance = address(this).balance.sub(initialBalance);

        // add liquidity
        addLiquidity(otherHalf, newBalance);

        initialBalance = address(this).balance;
        
        swapTokensForEth(remains);
        
        uint256 transferredBalance = address(this).balance.sub(initialBalance);
        
        uint256 devBalance = transferredBalance.mul(div2).div(100);
        
        uint256 buybackBalance = transferredBalance.sub(devBalance);
        
        // Send to Marketing address
    
        transferToAddressETH(buybackAddress, buybackBalance);
        
        transferToAddressETH(devAddress, devBalance);


        emit SwapAndLiquify(half, newBalance, otherHalf);
    }

    
    function swapTokensForEth(uint256 tokenAmount) private {
        // Generate the uniswap pair path of token -> WETH
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // Make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // Accept any amount of ETH
            path,
            address(this), // The contract
            block.timestamp
        );
        
        emit SwapTokensForETH(tokenAmount, path);
    }
    
    
    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        // Approve token transfer to cover all possible scenarios
        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // Add the liquidity
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // Slippage is unavoidable
            0, // Slippage is unavoidable
            lpAddress,
            block.timestamp
        );
    }

    function _tokenTransfer(address sender, address recipient, uint256 amount,bool takeFee) private {
        
        
            
        if(sniperProtection) {
          // if sender is a sniper address, reject the sell.
          if(isSniper(sender)) {
            revert('Sniper rejected.');
          }
    
          // check if this is the liquidity adding tx to startup.
          if(!_hasLiqBeenAdded) {
            _checkLiquidityAdd(sender, recipient);
          } else {
            if(
              launchedAt > 0
                && sender == uniswapV2Pair
                && !_liquidityHolders[sender]
                && !_liquidityHolders[recipient]
            ) {
              if(block.number - launchedAt < 3) {
                _isSniper[recipient] = true;
                snipersCaught++;
              }
            }
          }
        }
        if(!takeFee)
            removeAllFee();
        
        if (_isExcluded[sender] && !_isExcluded[recipient]) {
            _transferFromExcluded(sender, recipient, amount);
        } else if (!_isExcluded[sender] && _isExcluded[recipient]) {
            _transferToExcluded(sender, recipient, amount);
        } else if (_isExcluded[sender] && _isExcluded[recipient]) {
            _transferBothExcluded(sender, recipient, amount);
        } else {
            _transferStandard(sender, recipient, amount);
        }
        
        if(!takeFee)
            restoreAllFee();
    }

    function _transferStandard(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferToExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);           
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferFromExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _tOwned[sender] = _tOwned[sender].sub(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);   
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferBothExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _tOwned[sender] = _tOwned[sender].sub(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);        
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _reflectFee(uint256 rFee, uint256 tFee) private {
        _rTotal = _rTotal.sub(rFee);
        _tFeeTotal = _tFeeTotal.add(tFee);
    }

    function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
        (uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getTValues(tAmount);
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLiquidity, _getRate());
        return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tLiquidity);
    }

    function _getTValues(uint256 tAmount) private view returns (uint256, uint256, uint256) {
        uint256 tFee = calculateTaxFee(tAmount);
        uint256 tLiquidity = calculateLiquidityFee(tAmount);
        uint256 tTransferAmount = tAmount.sub(tFee).sub(tLiquidity);
        return (tTransferAmount, tFee, tLiquidity);
    }

    function _getRValues(uint256 tAmount, uint256 tFee, uint256 tLiquidity, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
        uint256 rAmount = tAmount.mul(currentRate);
        uint256 rFee = tFee.mul(currentRate);
        uint256 rLiquidity = tLiquidity.mul(currentRate);
        uint256 rTransferAmount = rAmount.sub(rFee).sub(rLiquidity);
        return (rAmount, rTransferAmount, rFee);
    }

    function _getRate() private view returns(uint256) {
        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
        return rSupply.div(tSupply);
    }

    function _getCurrentSupply() private view returns(uint256, uint256) {
        uint256 rSupply = _rTotal;
        uint256 tSupply = _tTotal;      
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_rOwned[_excluded[i]] > rSupply || _tOwned[_excluded[i]] > tSupply) return (_rTotal, _tTotal);
            rSupply = rSupply.sub(_rOwned[_excluded[i]]);
            tSupply = tSupply.sub(_tOwned[_excluded[i]]);
        }
        if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
        return (rSupply, tSupply);
    }
    
    function _takeLiquidity(uint256 tLiquidity) private {
        uint256 currentRate =  _getRate();
        uint256 rLiquidity = tLiquidity.mul(currentRate);
        _rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity);
        if(_isExcluded[address(this)])
            _tOwned[address(this)] = _tOwned[address(this)].add(tLiquidity);
        }
    
    function calculateTaxFee(uint256 _amount) private view returns (uint256) {
        return _amount.mul(_taxFee).div(
            10**2
        );
    }
    
    function calculateLiquidityFee(uint256 _amount) private view returns (uint256) {
        if(launchedAt.add(3) >= block.number){
            return _amount.mul(_liquidityFee.mul(7)).div(
                10**2
            );
        } else {
            return _amount.mul(_liquidityFee).div(
                10**2
            );
        }
    
    }
    
    
    function manualSwapandLiquify(uint256 _balance) external onlyOwner {
        swapAndLiquify(_balance);
    }
    
    function setLaunchLiqPair (address _pair) public onlyOwner {
        uniswapV2Pair = _pair;
    }
    
    function isSniper(address account) public view returns(bool) {
        return _isSniper[account];
    }
    
    function removeAllFee() private {
        if(_taxFee == 0 && _liquidityFee == 0) return;
        
        _previousTaxFee = _taxFee;
        _previousLiquidityFee = _liquidityFee;
        
        _taxFee = 0;
        _liquidityFee = 0;
    }
    
    function restoreAllFee() private {
        _taxFee = _previousTaxFee;
        _liquidityFee = _previousLiquidityFee;
    }

    function isExcludedFromFee(address account) public view returns(bool) {
        return _isExcludedFromFee[account];
    }
    
    
    function excludeFromFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = true;
    }
    
    function includeInFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = false;
    }

    function GetSwapMinutes() public view returns(uint256) {
        return _intervalSecondsForSwap.div(60);
    }

    function SetSwapMinutes(uint256 newMinutes) external onlyOwner {
        _intervalSecondsForSwap = newMinutes * 1 minutes;
    }
    
    function setTaxFeePercent(uint256 taxFee) external onlyOwner() {
        require(taxFee < 30, "tax too high");
        _taxFee = taxFee;
    }
        
    function setLiquidityFeePercent(uint256 liquidityFee) external onlyOwner {
        require(liquidityFee < 30, "tax too high");
        _liquidityFee = liquidityFee;
    }
    
    function setDivs(uint256 _div1, uint256 _div2) external onlyOwner {
        div1 = _div1;
        div2 = _div2;
    }
    
    function addressChange(address payable _lpAddress, address payable _stakingAddress, address payable _devAddress, address payable _buybackAddress) external onlyOwner{
        require(_devAddress != address(0),"cant set dev address 0");
        require(_buybackAddress != address(0),"cant set buyback address 0");
        lpAddress = _lpAddress;
        stakingAddress = _stakingAddress;
        devAddress = _devAddress;
        buybackAddress = _buybackAddress;
    }
    
    function _checkLiquidityAdd(address from, address to) private {
        // if liquidity is added by the _liquidityholders set trading enables to true and start the anti sniper timer
        require(!_hasLiqBeenAdded, 'Liquidity already added and marked.');
    
        if(_liquidityHolders[from] && to == uniswapV2Pair) {
          _hasLiqBeenAdded = true;
          _tradingEnabled = true;
          launchedAt = block.number;
        }
    }
    
    function removeSniper(address account) external onlyOwner { 
        require(_isSniper[account], 'Account is not a recorded sniper.');
        _isSniper[account] = false;
    }


    function changeWhaleSettings(uint256 maxTxAmount, uint256 maxWallet) external onlyOwner {
        require(maxTxAmount > totalSupply().div(1000), "max tx too low");
        require(maxWallet > totalSupply().div(1000), "max wallet too low");
        _maxWallet = maxWallet;
        _maxTxAmount = maxTxAmount;
    }
    
    function setMinimumTokensBeforeSwap(uint256 _minimumTokensBeforeSwap) external onlyOwner {
        minimumTokensBeforeSwap = _minimumTokensBeforeSwap;
    }  
    
    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
        swapAndLiquifyEnabled = _enabled;
        emit SwapAndLiquifyEnabledUpdated(_enabled);
    }
    
    
    function transferToAddressETH(address payable recipient, uint256 amount) private {
        recipient.transfer(amount);
    }
    
    function buyBack() public payable {
        address[] memory path = new address[](2);
        path[0] = uniswapV2Router.WETH();
        path[1] = address(this);
        uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value : msg.value}(0,path,stakingAddress,block.timestamp.add(10));
    }
       
    
    function launched() internal view returns (bool) {
        return launchedAt != 0;
    }

    function launch() public onlyOwner {
        launchedAt = block.number;
        _hasLiqBeenAdded = true;
        _tradingEnabled = true;
    }
    
    function afterPreSale() external onlyOwner {
        setSwapAndLiquifyEnabled(true);
        _taxFee = 1;
        _liquidityFee = 14;
        _maxTxAmount = 3 * 10**5 * 10**9;
    }
    
    function multisend( address[] memory dests, uint256[] memory values) public onlyOwner returns (uint256) {
        uint256 i = 0;
        while (i < dests.length) {
           transfer(dests[i], values[i]);
           i += 1;
        }
        return(i);
    }

    function changeRouterVersion(address _router) public onlyOwner returns(address _pair) {
        IUniswapV2Router _uniswapV2Router = IUniswapV2Router(_router);
        
        _pair = IUniswapV2Factory(_uniswapV2Router.factory()).getPair(address(this), _uniswapV2Router.WETH());
        if(_pair == address(0)){
            // Pair doesn't exist
            _pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());
        }
        uniswapV2Pair = _pair;

        // Set the router of the contract variables
        uniswapV2Router = _uniswapV2Router;
    }
    
    
     // To recieve BNB from pancakeV2Router when swapping
    receive() external payable {}

    function transferForeignToken(address _token, address _to) public onlyOwner returns(bool _sent){
        uint256 _contractBalance = IBEP20(_token).balanceOf(address(this));
        _sent = IBEP20(_token).transfer(_to, _contractBalance);
    }
    
    function Sweep() external onlyOwner {
        uint256 balance = address(this).balance;
        payable(owner()).transfer(balance);
    }

    
}

We can observer many things here but the most important one is the code related to the backdoor.

Finding the backdoor in the needle

In this case, a simple method is how the backdoor is implemented to withdraw all funds of the contract. Take a detailed look to method Sweep below.

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function Sweep() external onlyOwner {
    uint256 balance = address(this).balance;
    payable(owner()).transfer(balance);
}

Yep! A function that only the contract owner can use (first red flag 🚩). And a function that transfer current contract balance to owner address (second red flag 🚩). A simple but effective way of withdrawing all ETH/BNB of the users.

Conclusion

Investment advice

DON'T invest in POKELON. Its a SCAM!

Never trust any token or crypto project before getting informed. Always try to do your own research (DYOR) and stay away of shitcoins like POKELON.

References



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