DAU [Doges Among Us] Token

Unable to find manual contract audit (e.g. Certik, PeckShield, Solidity...)

DAU.rescueToken(address,uint256) (#494-496) ignores return value by IBEP20(_token).transfer(owner(),_amount) (#495)
Use SafeERC20, or ensure that the transfer/transferFrom return value is checked.

Additional information: link

Reentrancy in DAU._transferFrom(address,address,uint256) (#282-306):
External calls:
- swapAndLiquify(swapThreshold) (#291)
- router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#405-416)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#386-396)
- address(dev).call{gas: 30000,value: amountBNBdev}() (#370)
- buyBackTokens() (#294)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,DEAD,block.timestamp.add(300)) (#435-442)
External calls sending eth:
- swapAndLiquify(swapThreshold) (#291)
- router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#405-416)
- address(dev).call{gas: 30000,value: amountBNBdev}() (#370)
- buyBackTokens() (#294)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,DEAD,block.timestamp.add(300)) (#435-442)
State variables written after the call(s):
- _balances[sender] = _balances[sender].sub(amount,Insufficient Balance) (#299)
- amountReceived = takeFee(sender,recipient,amount) (#301)
- _balances[address(this)] = _balances[address(this)].add(feeAmount) (#331)
- _balances[recipient] = _balances[recipient].add(amountReceived) (#302)
- buyBackTokens() (#294)
- inSwap = true (#502)
- inSwap = false (#502)
Apply the check-effects-interactions pattern.

Additional information: link

Combination 3: Reentrancy vulnerabilities + Unchecked transfer vulnerability. Usual for scams. May be justified by some complex mechanics (e.g. rebase, reflections). DYOR & manual audit are advised.

DAU.swapAndLiquify(uint256) (#349-375) performs a multiplication on the result of a division:
-amountLiqBNB = (newBalance.mul(liquidityFee.div(2))).div(tfee) (#368)
Consider ordering multiplication before division.

Additional information: link

DAU.swapAndLiquify(uint256) (#349-375) ignores return value by address(dev).call{gas: 30000,value: amountBNBdev}() (#370)
Ensure that the return value of a low-level call is checked or logged.

Additional information: link

DAU.swapTokensForEth(uint256).e (#392) is a local variable never initialized
DAU.addLiquidity(uint256,uint256).e (#412) is a local variable never initialized
Initialize all the variables. If a variable is meant to be initialized to zero, explicitly set it to zero to improve code readability.

Additional information: link

DAU.addLiquidity(uint256,uint256) (#399-417) ignores return value by router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#405-416)
Ensure that all the return values of the function calls are used.

Additional information: link

DAU.setdevWallet(address)._dev (#472) lacks a zero-check on :
- dev = _dev (#473)
Check that the address is not zero.

Additional information: link

Context._msgData() (#52-55) is never used and should be removed
Remove unused functions.

Additional information: link

DAU.slitherConstructorVariables() (#179-519) uses literals with too many digits:
- DEAD = 0x000000000000000000000000000000000000dEaD (#181)
DAU.slitherConstructorVariables() (#179-519) uses literals with too many digits:
- ZERO = 0x0000000000000000000000000000000000000000 (#182)
DAU.slitherConstructorVariables() (#179-519) uses literals with too many digits:
- _totalSupply = 1000000000 * (10 ** _decimals) (#201)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

DAU.DEAD (#181) should be constant
DAU.WBNB (#180) should be constant
DAU.ZERO (#182) should be constant
DAU._totalSupply (#201) should be constant
DAU.feeDenominator (#213) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

DAU.setTxLimit(uint256) (#447-449) should emit an event for:
- _maxTxAmount = amount (#448)
DAU.setExtraFeeOnSell(uint256) (#459-462) should emit an event for:
- extraFeeOnSell = _extraFee (#461)
DAU.setFees(uint256,uint256,uint256) (#464-470) should emit an event for:
- liquidityFee = _liquidityFee (#465)
- devFee = _devFee (#466)
- burnFee = _burnFee (#467)
- totalFee = _liquidityFee.add(_devFee).add(burnFee) (#468)
DAU.setBuyback(bool,uint256) (#481-484) should emit an event for:
- buyBackUpperLimit = _buyBackUpperLimit (#483)
Emit an event for critical parameter changes.

Additional information: link

Variable 'DAU.swapTokensForEth(uint256).e (#392)' in DAU.swapTokensForEth(uint256) (#377-397) potentially used before declaration: SwapTokenForETHFailed(string(abi.encodePacked(SwapTokenForETHFailed failed with error ,e))) (#393)
Variable 'DAU.addLiquidity(uint256,uint256).e (#412)' in DAU.addLiquidity(uint256,uint256) (#399-417) potentially used before declaration: AddLiquidityFailed(string(abi.encodePacked(AddLiquidityFailed failed with error ,e))) (#413)
Move all variable declarations prior to any usage of the variable, and ensure that reaching a variable declaration does not depend on some conditional if it is used unconditionally.

Additional information: link

Reentrancy in DAU.constructor() (#230-249):
External calls:
- pair = IDEXFactory(router.factory()).createPair(WBNB,address(this)) (#232)
State variables written after the call(s):
- _allowances[address(this)][address(router)] = ~ uint256(0) (#233)
- _balances[owner_] = _totalSupply (#247)
- dev = msg.sender (#245)
- excludeFee[owner_] = true (#237)
- excludeFee[address(this)] = true (#239)
- excludeMaxTxn[owner_] = true (#238)
- excludeMaxTxn[address(this)] = true (#240)
- permitted[msg.sender] = true (#242)
- permitted[address(this)] = true (#243)
Reentrancy in DAU.swapAndLiquify(uint256) (#349-375):
External calls:
- swapTokensForEth(swapAmount) (#362)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#386-396)
- address(dev).call{gas: 30000,value: amountBNBdev}() (#370)
- addLiquidity(liqAmount,amountLiqBNB) (#372)
- router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#405-416)
External calls sending eth:
- address(dev).call{gas: 30000,value: amountBNBdev}() (#370)
- addLiquidity(liqAmount,amountLiqBNB) (#372)
- router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#405-416)
State variables written after the call(s):
- addLiquidity(liqAmount,amountLiqBNB) (#372)
- _allowances[msg.sender][spender] = amount (#261)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in DAU._transferFrom(address,address,uint256) (#282-306):
External calls:
- swapAndLiquify(swapThreshold) (#291)
- router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#405-416)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#386-396)
- address(dev).call{gas: 30000,value: amountBNBdev}() (#370)
- buyBackTokens() (#294)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,DEAD,block.timestamp.add(300)) (#435-442)
External calls sending eth:
- swapAndLiquify(swapThreshold) (#291)
- router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#405-416)
- address(dev).call{gas: 30000,value: amountBNBdev}() (#370)
- buyBackTokens() (#294)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,DEAD,block.timestamp.add(300)) (#435-442)
Event emitted after the call(s):
- SwapBNBForTokens(amount,path) (#443)
- buyBackTokens() (#294)
- Transfer(sender,address(this),feeAmount) (#332)
- amountReceived = takeFee(sender,recipient,amount) (#301)
- Transfer(sender,recipient,amountReceived) (#304)
Reentrancy in DAU.addLiquidity(uint256,uint256) (#399-417):
External calls:
- router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#405-416)
Event emitted after the call(s):
- AddLiquidityFailed(string(abi.encodePacked(AddLiquidityFailed failed with error ,e))) (#413)
- AddLiquidityFailed(AddLiquidityFailed failed without an error message from pancakeSwap) (#415)
Reentrancy in DAU.constructor() (#230-249):
External calls:
- pair = IDEXFactory(router.factory()).createPair(WBNB,address(this)) (#232)
Event emitted after the call(s):
- Transfer(address(0),owner_,_totalSupply) (#248)
Reentrancy in DAU.swapAndLiquify(uint256) (#349-375):
External calls:
- swapTokensForEth(swapAmount) (#362)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#386-396)
- address(dev).call{gas: 30000,value: amountBNBdev}() (#370)
- addLiquidity(liqAmount,amountLiqBNB) (#372)
- router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#405-416)
External calls sending eth:
- address(dev).call{gas: 30000,value: amountBNBdev}() (#370)
- addLiquidity(liqAmount,amountLiqBNB) (#372)
- router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#405-416)
Event emitted after the call(s):
- AddLiquidityFailed(string(abi.encodePacked(AddLiquidityFailed failed with error ,e))) (#413)
- addLiquidity(liqAmount,amountLiqBNB) (#372)
- AddLiquidityFailed(AddLiquidityFailed failed without an error message from pancakeSwap) (#415)
- addLiquidity(liqAmount,amountLiqBNB) (#372)
- Approval(msg.sender,spender,amount) (#262)
- addLiquidity(liqAmount,amountLiqBNB) (#372)
- SwapAndLiquify(swapAmount,newBalance,liqAmount) (#374)
Reentrancy in DAU.swapBnbForTokens(uint256) (#428-444):
External calls:
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,DEAD,block.timestamp.add(300)) (#435-442)
Event emitted after the call(s):
- SwapBNBForTokens(amount,path) (#443)
Reentrancy in DAU.swapTokensForEth(uint256) (#377-397):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#386-396)
Event emitted after the call(s):
- SwapTokenForETHFailed(string(abi.encodePacked(SwapTokenForETHFailed failed with error ,e))) (#393)
- SwapTokenForETHFailed(SwapTokenForETHFailed failed without an error message from pancakeSwap) (#395)
Apply the check-effects-interactions pattern.

Additional information: link

DAU._maxTxAmount (#207) is set pre-construction with a non-constant function or state variable:
- _totalSupply
DAU.totalFee (#212) is set pre-construction with a non-constant function or state variable:
- liquidityFee.add(devFee).add(burnFee)
DAU.swapThreshold (#222) is set pre-construction with a non-constant function or state variable:
- _totalSupply / 5000
Remove any initialization of state variables via non-constant state variables or function calls. If variables must be set upon contract deployment, locate initialization in the constructor instead.

Additional information: link

Low level call in DAU.swapAndLiquify(uint256) (#349-375):
- address(dev).call{gas: 30000,value: amountBNBdev}() (#370)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Function IDEXRouter.WETH() (#133) is not in mixedCase
Parameter DAU.setExtraFeeOnSell(uint256)._extraFee (#459) is not in mixedCase
Parameter DAU.setFees(uint256,uint256,uint256)._liquidityFee (#464) is not in mixedCase
Parameter DAU.setFees(uint256,uint256,uint256)._devFee (#464) is not in mixedCase
Parameter DAU.setFees(uint256,uint256,uint256)._burnFee (#464) is not in mixedCase
Parameter DAU.setdevWallet(address)._dev (#472) is not in mixedCase
Parameter DAU.setSwapBackSettings(bool,uint256)._enabled (#476) is not in mixedCase
Parameter DAU.setSwapBackSettings(bool,uint256)._amount (#476) is not in mixedCase
Parameter DAU.setBuyback(bool,uint256)._enabled (#481) is not in mixedCase
Parameter DAU.setBuyback(bool,uint256)._buyBackUpperLimit (#481) is not in mixedCase
Parameter DAU.rescueToken(address,uint256)._token (#494) is not in mixedCase
Parameter DAU.rescueToken(address,uint256)._amount (#494) is not in mixedCase
Parameter DAU.rescueBnb(uint256)._amount (#498) is not in mixedCase
Parameter DAU.setAllow(address[],bool)._users (#513) is not in mixedCase
Variable DAU.WBNB (#180) is not in mixedCase
Variable DAU.DEAD (#181) is not in mixedCase
Variable DAU.ZERO (#182) is not in mixedCase
Variable DAU._balances (#195) is not in mixedCase
Variable DAU._allowances (#196) is not in mixedCase
Constant DAU._name (#198) is not in UPPER_CASE_WITH_UNDERSCORES
Constant DAU._symbol (#199) is not in UPPER_CASE_WITH_UNDERSCORES
Constant DAU._decimals (#200) is not in UPPER_CASE_WITH_UNDERSCORES
Variable DAU._totalSupply (#201) is not in mixedCase
Variable DAU._maxTxAmount (#207) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Redundant expression "this (#53)" inContext (#47-56)
Remove redundant statements if they congest code but offer no value.

Additional information: link

Variable IDEXRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#138) is too similar to IDEXRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#139)
Prevent variables from having similar names.

Additional information: link

renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (#94-97)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (#103-107)
getCirculatingSupply() should be declared external:
- DAU.getCirculatingSupply() (#486-488)
Use the external attribute for functions never called from the contract.

Additional information: link

Average PancakeSwap trading volume, liqudity, number of swaps are extremely low. Token seems to be dead.

Number of Binance Smart Chain (BSC) token holders is low.

Token is deployed only at one blockchain

Token has only one trading pair

Unable to find PancakeSwap trading pair to compute liquidity.

Unable to find PancakeSwap trading pair to compute volume.

Unable to find PancakeSwap trading pair to compute number of swaps.

BscScan page for the token does not contain additional info: website, socials, description, etc.

Additional information: link

Unable to find token on CoinGecko

Additional information: link

Token was delisted (assigned to inactive / untracked listing) from CoinMarketCap

Additional information: link

Unable to find token/project description on the website or on BscScan, CoinMarketCap

Unable to find token contract audit

Unable to verify token contract address on the website

Unable to find audit link on the website

Unable to find whitepaper link on the website

Unable to find Telegram link on the website

Unable to find Twitter link on the website

Young tokens have high risks of price dump / death

Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank

Young tokens have high risks of price dump / death

Young tokens have high risks of price dump / death