MAO [MAO INU] Token

MAO.swapBack() (#588-617) sends eth to arbitrary user
Dangerous calls:
- (success) = address(devFeeReceiver).call{gas: 30000,value: amountETHToDev}() (#613-616)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Reentrancy in MAO._transfer(address,address,uint256) (#495-527):
External calls:
- addLiquidity() (#510)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#565-571)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#576-583)
- swapBack() (#514)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#601-607)
- (success) = address(devFeeReceiver).call{gas: 30000,value: amountETHToDev}() (#613-616)
External calls sending eth:
- addLiquidity() (#510)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#576-583)
- swapBack() (#514)
- (success) = address(devFeeReceiver).call{gas: 30000,value: amountETHToDev}() (#613-616)
State variables written after the call(s):
- _balances[sender] = senderBalance.sub(amount) (#517)
- _balances[recipient] = _balances[recipient].add(amountReceived) (#521-523)
- amountReceived = takeFee(sender,amount) (#518-520)
- _balances[address(this)] = _balances[address(this)].add(gonAmount.div(feeDenominator).mul(devFee)) (#536-538)
- _balances[autoLiquidityReceiver] = _balances[autoLiquidityReceiver].add(gonAmount.div(feeDenominator).mul(liquidityFee)) (#539-541)
- swapBack() (#514)
- inSwap = true (#381)
- inSwap = false (#383)
Apply the check-effects-interactions pattern.

Additional information: link

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

Combination 1: Reentrancy vulnerabilities + Functions that send Ether to arbitraty destination. Usual for scams. May be justified by some complex mechanics (e.g. rebase, reflections). DYOR & manual audit are advised.

Contract ownership is not renounced (belongs to a wallet)

MAO.takeFee(address,uint256) (#529-545) performs a multiplication on the result of a division:
-feeAmount = gonAmount.div(feeDenominator).mul(_totalFee) (#534)
MAO.takeFee(address,uint256) (#529-545) performs a multiplication on the result of a division:
-_balances[address(this)] = _balances[address(this)].add(gonAmount.div(feeDenominator).mul(devFee)) (#536-538)
MAO.takeFee(address,uint256) (#529-545) performs a multiplication on the result of a division:
-_balances[autoLiquidityReceiver] = _balances[autoLiquidityReceiver].add(gonAmount.div(feeDenominator).mul(liquidityFee)) (#539-541)
Consider ordering multiplication before division.

Additional information: link

MAO.addLiquidity() (#547-586) ignores return value by router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#576-583)
Ensure that all the return values of the function calls are used.

Additional information: link

MAO.allowance(address,address).owner (#449) shadows:
- Ownable.owner() (#116-118) (function)
MAO._approve(address,address,uint256).owner (#671) shadows:
- Ownable.owner() (#116-118) (function)
Rename the local variables that shadow another component.

Additional information: link

MAO.setFeeReceivers(address,address)._autoLiquidityReceiver (#654) lacks a zero-check on :
- autoLiquidityReceiver = _autoLiquidityReceiver (#658)
MAO.setFeeReceivers(address,address)._devFeeReceiver (#655) lacks a zero-check on :
- devFeeReceiver = _devFeeReceiver (#659)
Check that the address is not zero.

Additional information: link

Reentrancy in MAO.addLiquidity() (#547-586):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#565-571)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#576-583)
External calls sending eth:
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#576-583)
State variables written after the call(s):
- _lastAddLiquidityTime = block.timestamp (#585)
Reentrancy in MAO.constructor() (#392-414):
External calls:
- pair = IPancakeSwapFactory(router.factory()).createPair(router.WETH(),address(this)) (#400-403)
State variables written after the call(s):
- _autoAddLiquidity = false (#409)
- _balances[owner()] = _totalSupply (#412)
- _isExcludedFromTax[owner()] = true (#410)
- _isExcludedFromTax[address(this)] = true (#411)
- _totalSupply = 1000000 * 10 ** (_decimals) (#408)
- autoLiquidityReceiver = 0x9901cD613452cbFf9957BA1309A8B036e1408d8E (#405)
- devFeeReceiver = 0x3f3940d6Da865A417EF4381C95AD3DefB24Ce338 (#406)
- managers[owner()] = true (#413)
Reentrancy in MAO.transferFrom(address,address,uint256) (#458-470):
External calls:
- _transfer(sender,recipient,amount) (#463)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#601-607)
- (success) = address(devFeeReceiver).call{gas: 30000,value: amountETHToDev}() (#613-616)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#565-571)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#576-583)
External calls sending eth:
- _transfer(sender,recipient,amount) (#463)
- (success) = address(devFeeReceiver).call{gas: 30000,value: amountETHToDev}() (#613-616)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#576-583)
State variables written after the call(s):
- _approve(sender,_msgSender(),currentAllowance - amount) (#467)
- _allowances[owner][spender] = amount (#678)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in MAO._transfer(address,address,uint256) (#495-527):
External calls:
- addLiquidity() (#510)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#565-571)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#576-583)
- swapBack() (#514)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#601-607)
- (success) = address(devFeeReceiver).call{gas: 30000,value: amountETHToDev}() (#613-616)
External calls sending eth:
- addLiquidity() (#510)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#576-583)
- swapBack() (#514)
- (success) = address(devFeeReceiver).call{gas: 30000,value: amountETHToDev}() (#613-616)
Event emitted after the call(s):
- Transfer(sender,address(this),feeAmount) (#543)
- amountReceived = takeFee(sender,amount) (#518-520)
- Transfer(sender,recipient,amount) (#525)
Reentrancy in MAO.transferFrom(address,address,uint256) (#458-470):
External calls:
- _transfer(sender,recipient,amount) (#463)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#601-607)
- (success) = address(devFeeReceiver).call{gas: 30000,value: amountETHToDev}() (#613-616)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#565-571)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#576-583)
External calls sending eth:
- _transfer(sender,recipient,amount) (#463)
- (success) = address(devFeeReceiver).call{gas: 30000,value: amountETHToDev}() (#613-616)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#576-583)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#679)
- _approve(sender,_msgSender(),currentAllowance - amount) (#467)
Apply the check-effects-interactions pattern.

Additional information: link

MAO.shouldAddLiquidity() (#630-636) uses timestamp for comparisons
Dangerous comparisons:
- _autoAddLiquidity && ! inSwap && msg.sender != pair && block.timestamp >= (_lastAddLiquidityTime + 600) (#631-635)
Avoid relying on block.timestamp.

Additional information: link

MAO.setFeeReceivers(address,address) (#653-660) compares to a boolean constant:
-require(bool)(managers[msg.sender] == true) (#657)
Remove the equality to the boolean constant.

Additional information: link

Context._msgData() (#96-98) is never used and should be removed
SafeMath.mod(uint256,uint256) (#81-83) is never used and should be removed
SafeMath.mod(uint256,uint256,string) (#85-88) is never used and should be removed
Remove unused functions.

Additional information: link

MAO.totalFee (#371) is set pre-construction with a non-constant function or state variable:
- liquidityFee.add(devFee)
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

Pragma version^0.8.0 (#3) allows old versions
solc-0.8.0 is not recommended for deployment
Deploy with any of the following Solidity versions: 0.5.16 - 0.5.17, 0.6.11 - 0.6.12, 0.7.5 - 0.7.6 Use a simple pragma version that allows any of these versions. Consider using the latest version of Solidity for testing.

Additional information: link

Low level call in MAO.swapBack() (#588-617):
- (success) = address(devFeeReceiver).call{gas: 30000,value: amountETHToDev}() (#613-616)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Function IPancakeSwapPair.DOMAIN_SEPARATOR() (#170) is not in mixedCase
Function IPancakeSwapPair.PERMIT_TYPEHASH() (#171) is not in mixedCase
Function IPancakeSwapPair.MINIMUM_LIQUIDITY() (#188) is not in mixedCase
Function IPancakeSwapRouter.WETH() (#208) is not in mixedCase
Parameter MAO.addManger(address)._addr (#416) is not in mixedCase
Parameter MAO.setAutoAddLiquidity(bool)._flag (#644) is not in mixedCase
Parameter MAO.setFeeReceivers(address,address)._autoLiquidityReceiver (#654) is not in mixedCase
Parameter MAO.setFeeReceivers(address,address)._devFeeReceiver (#655) is not in mixedCase
Variable MAO._autoAddLiquidity (#386) is not in mixedCase
Variable MAO._lastAddLiquidityTime (#387) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Variable IPancakeSwapRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#213) is too similar to IPancakeSwapRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#214)
Prevent variables from having similar names.

Additional information: link

MAO.constructor() (#392-414) uses literals with too many digits:
- _totalSupply = 1000000 * 10 ** (_decimals) (#408)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

MAO._decimals (#367) should be constant
MAO._name (#365) should be constant
MAO._symbol (#366) should be constant
MAO.devFee (#370) should be constant
MAO.feeDenominator (#372) should be constant
MAO.liquidityFee (#369) should be constant
MAO.pairAddress (#376) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (#135-137)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (#143-146)
name() should be declared external:
- MAO.name() (#420-422)
symbol() should be declared external:
- MAO.symbol() (#424-426)
decimals() should be declared external:
- MAO.decimals() (#428-430)
totalSupply() should be declared external:
- MAO.totalSupply() (#432-434)
balanceOf(address) should be declared external:
- MAO.balanceOf(address) (#436-438)
isExcludedFromTax(address) should be declared external:
- MAO.isExcludedFromTax(address) (#440-442)
transfer(address,uint256) should be declared external:
- MAO.transfer(address,uint256) (#444-447)
allowance(address,address) should be declared external:
- MAO.allowance(address,address) (#449-451)
approve(address,uint256) should be declared external:
- MAO.approve(address,uint256) (#453-456)
transferFrom(address,address,uint256) should be declared external:
- MAO.transferFrom(address,address,uint256) (#458-470)
increaseAllowance(address,uint256) should be declared external:
- MAO.increaseAllowance(address,uint256) (#472-475)
decreaseAllowance(address,uint256) should be declared external:
- MAO.decreaseAllowance(address,uint256) (#477-483)
includeInTax(address) should be declared external:
- MAO.includeInTax(address) (#662-664)
excludeInTax(address) should be declared external:
- MAO.excludeInTax(address) (#666-668)
Use the external attribute for functions never called from the contract.

Additional information: link

Token seems to be untradeable: there is no PancakeSwap trading pair and no trading volumes. Ignore for presale.

Number of Binance Smart Chain (BSC) token holders is less than 100. Token is either dead or inactive. Ignore for presale.

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

Additional information: link

Unable to find token contract audit

Unable to find KYC or doxxing proof

Unable to verify that token and website are owned by the same team (no listings + unable to find contract on website)

Unable to verify token contract address on the website

Unable to find audit link on the website

Unable to find token on CoinGecko

Additional information: link

Unable to find token on CoinMarketCap

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Token is not listed at Mobula.Finance

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Unable to find token on CoinHunt

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Unable to find code repository for the project

Young tokens have high risks of scam / price dump / death

Young tokens have high risks of scam / 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