GROOV Token

Contract creator or owner is blacklisted for past scams

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

Groov.swapBack() (#683-721) sends eth to arbitrary user
Dangerous calls:
- (success) = address(treasuryReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(treasuryFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#709-714)
- (success,None) = address(groovInsuranceFundReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(groovInsuranceFundFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#715-720)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Reentrancy in Groov._transferFrom(address,address,uint256) (#569-608):
External calls:
- rebase() (#581)
- pairContract.sync() (#528)
- addLiquidity() (#585)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#660-666)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#671-678)
- swapBack() (#589)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#697-703)
- (success) = address(treasuryReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(treasuryFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#709-714)
- (success,None) = address(groovInsuranceFundReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(groovInsuranceFundFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#715-720)
External calls sending eth:
- addLiquidity() (#585)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#671-678)
- swapBack() (#589)
- (success) = address(treasuryReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(treasuryFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#709-714)
- (success,None) = address(groovInsuranceFundReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(groovInsuranceFundFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#715-720)
State variables written after the call(s):
- _gonBalances[sender] = _gonBalances[sender].sub(gonAmount) (#593)
- _gonBalances[recipient] = _gonBalances[recipient].add(gonAmountReceived) (#597-599)
- gonAmountReceived = takeFee(sender,recipient,gonAmount) (#594-596)
- _gonBalances[firePit] = _gonBalances[firePit].add(gonAmount.div(feeDenominator).mul(firePitFee)) (#625-627)
- _gonBalances[address(this)] = _gonBalances[address(this)].add(gonAmount.div(feeDenominator).mul(_treasuryFee.add(groovInsuranceFundFee))) (#628-630)
- _gonBalances[autoLiquidityReceiver] = _gonBalances[autoLiquidityReceiver].add(gonAmount.div(feeDenominator).mul(liquidityFee)) (#631-633)
- swapBack() (#589)
- inSwap = true (#447)
- inSwap = false (#449)
Apply the check-effects-interactions pattern.

Additional information: link

Groov._name (#404) shadows:
- ERC20Detailed._name (#370)
Groov._symbol (#405) shadows:
- ERC20Detailed._symbol (#371)
Groov._decimals (#406) shadows:
- ERC20Detailed._decimals (#372)
Remove the state variable shadowing.

Additional information: link

Too many vulnerabilities (Unchecked transfer, Reentrancy vulnerability, etc.). High risk of a scam. DYOR & manual audit are advised.

Contract ownership is not renounced (belongs to a wallet)

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.

Groov.swapBack().success (#709) is written in both
(success) = address(treasuryReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(treasuryFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#709-714)
(success,None) = address(groovInsuranceFundReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(groovInsuranceFundFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#715-720)
Fix or remove the writes.

Additional information: link

Low level call in Groov.swapBack() (#683-721):
- (success) = address(treasuryReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(treasuryFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#709-714)
- (success,None) = address(groovInsuranceFundReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(groovInsuranceFundFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#715-720)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Groov.rebase().rebaseRate (#503) 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

SafeMathInt.MAX_INT256 (#9) is never used in SafeMathInt (#7-41)
Remove unused state variables.

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Groov.rebase() (#500-531) performs a multiplication on the result of a division:
-times = deltaTime.div(900) (#506)
-epoch = times.mul(15) (#507)
Groov.rebase() (#500-531) performs a multiplication on the result of a division:
-times = deltaTime.div(900) (#506)
-_lastRebasedTime = _lastRebasedTime.add(times.mul(900)) (#526)
Groov.takeFee(address,address,uint256) (#610-637) performs a multiplication on the result of a division:
-feeAmount = gonAmount.div(feeDenominator).mul(_totalFee) (#623)
Groov.takeFee(address,address,uint256) (#610-637) performs a multiplication on the result of a division:
-_gonBalances[firePit] = _gonBalances[firePit].add(gonAmount.div(feeDenominator).mul(firePitFee)) (#625-627)
Groov.takeFee(address,address,uint256) (#610-637) performs a multiplication on the result of a division:
-_gonBalances[address(this)] = _gonBalances[address(this)].add(gonAmount.div(feeDenominator).mul(_treasuryFee.add(groovInsuranceFundFee))) (#628-630)
Groov.takeFee(address,address,uint256) (#610-637) performs a multiplication on the result of a division:
-_gonBalances[autoLiquidityReceiver] = _gonBalances[autoLiquidityReceiver].add(gonAmount.div(feeDenominator).mul(liquidityFee)) (#631-633)
Groov.getLiquidityBacking(uint256) (#878-886) performs a multiplication on the result of a division:
-liquidityBalance = _gonBalances[pair].div(_gonsPerFragment) (#883)
-accuracy.mul(liquidityBalance.mul(2)).div(getCirculatingSupply()) (#884-885)
Consider ordering multiplication before division.

Additional information: link

Groov.addLiquidity() (#639-681) ignores return value by router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#671-678)
Ensure that all the return values of the function calls are used.

Additional information: link

Groov.setFeeReceivers(address,address,address,address)._autoLiquidityReceiver (#867) lacks a zero-check on :
- autoLiquidityReceiver = _autoLiquidityReceiver (#872)
Groov.setFeeReceivers(address,address,address,address)._treasuryReceiver (#868) lacks a zero-check on :
- treasuryReceiver = _treasuryReceiver (#873)
Groov.setFeeReceivers(address,address,address,address)._groovInsuranceFundReceiver (#869) lacks a zero-check on :
- groovInsuranceFundReceiver = _groovInsuranceFundReceiver (#874)
Groov.setFeeReceivers(address,address,address,address)._firePit (#870) lacks a zero-check on :
- firePit = _firePit (#875)
Groov.setPairAddress(address)._pairAddress (#897) lacks a zero-check on :
- pairAddress = _pairAddress (#898)
Check that the address is not zero.

Additional information: link

Reentrancy in Groov.addLiquidity() (#639-681):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#660-666)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#671-678)
External calls sending eth:
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#671-678)
State variables written after the call(s):
- _lastAddLiquidityTime = block.timestamp (#680)
Reentrancy in Groov.constructor() (#469-498):
External calls:
- pair = IPancakeSwapFactory(router.factory()).createPair(router.WETH(),address(this)) (#472-475)
State variables written after the call(s):
- _allowedFragments[address(this)][address(router)] = uint256(- 1) (#482)
- _autoAddLiquidity = true (#492)
- _autoRebase = true (#491)
- _gonBalances[treasuryReceiver] = TOTAL_GONS (#487)
- _gonsPerFragment = TOTAL_GONS.div(_totalSupply) (#488)
- _initRebaseStartTime = block.timestamp (#489)
- _isFeeExempt[treasuryReceiver] = true (#493)
- _isFeeExempt[address(this)] = true (#494)
- _lastRebasedTime = block.timestamp (#490)
- _transferOwnership(treasuryReceiver) (#496)
- _owner = newOwner (#365)
- _totalSupply = INITIAL_FRAGMENTS_SUPPLY (#486)
- autoLiquidityReceiver = 0x8F87B8eB7cC38b797982A4e0b7Af1Bd8FFEEd800 (#477)
- firePit = 0x8F87B8eB7cC38b797982A4e0b7Af1Bd8FFEEd800 (#480)
- groovInsuranceFundReceiver = 0x8F87B8eB7cC38b797982A4e0b7Af1Bd8FFEEd800 (#479)
- pairAddress = pair (#483)
- pairContract = IPancakeSwapPair(pair) (#484)
- treasuryReceiver = 0x8F87B8eB7cC38b797982A4e0b7Af1Bd8FFEEd800 (#478)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in Groov._transferFrom(address,address,uint256) (#569-608):
External calls:
- rebase() (#581)
- pairContract.sync() (#528)
- addLiquidity() (#585)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#660-666)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#671-678)
- swapBack() (#589)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#697-703)
- (success) = address(treasuryReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(treasuryFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#709-714)
- (success,None) = address(groovInsuranceFundReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(groovInsuranceFundFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#715-720)
External calls sending eth:
- addLiquidity() (#585)
- router.addLiquidityETH{value: amountETHLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#671-678)
- swapBack() (#589)
- (success) = address(treasuryReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(treasuryFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#709-714)
- (success,None) = address(groovInsuranceFundReceiver).call{gas: 30000,value: amountETHToTreasuryAndSIF.mul(groovInsuranceFundFee).div(treasuryFee.add(groovInsuranceFundFee))}() (#715-720)
Event emitted after the call(s):
- Transfer(sender,address(this),feeAmount.div(_gonsPerFragment)) (#635)
- gonAmountReceived = takeFee(sender,recipient,gonAmount) (#594-596)
- Transfer(sender,recipient,gonAmountReceived.div(_gonsPerFragment)) (#602-606)
Reentrancy in Groov.constructor() (#469-498):
External calls:
- pair = IPancakeSwapFactory(router.factory()).createPair(router.WETH(),address(this)) (#472-475)
Event emitted after the call(s):
- OwnershipTransferred(_owner,newOwner) (#364)
- _transferOwnership(treasuryReceiver) (#496)
- Transfer(address(0x0),treasuryReceiver,_totalSupply) (#497)
Reentrancy in Groov.rebase() (#500-531):
External calls:
- pairContract.sync() (#528)
Event emitted after the call(s):
- LogRebase(epoch,_totalSupply) (#530)
Apply the check-effects-interactions pattern.

Additional information: link

Groov.rebase() (#500-531) uses timestamp for comparisons
Dangerous comparisons:
- deltaTimeFromInit < (31536000) (#509)
- deltaTimeFromInit >= (31536000) (#511)
- deltaTimeFromInit >= ((15 * 31536000) / 10) (#513)
- deltaTimeFromInit >= (7 * 31536000) (#515)
- i < times (#519)
Groov.shouldRebase() (#752-759) uses timestamp for comparisons
Dangerous comparisons:
- _autoRebase && (_totalSupply < MAX_SUPPLY) && msg.sender != pair && ! inSwap && block.timestamp >= (_lastRebasedTime + 900) (#753-758)
Groov.shouldAddLiquidity() (#761-767) uses timestamp for comparisons
Dangerous comparisons:
- _autoAddLiquidity && ! inSwap && msg.sender != pair && block.timestamp >= (_lastAddLiquidityTime + 172800) (#762-766)
Avoid relying on block.timestamp.

Additional information: link

Groov.isContract(address) (#913-917) uses assembly
- INLINE ASM (#915)
Do not use evm assembly.

Additional information: link

SafeMath.mod(uint256,uint256) (#92-95) is never used and should be removed
SafeMathInt.abs(int256) (#37-40) is never used and should be removed
SafeMathInt.add(int256,int256) (#31-35) is never used and should be removed
SafeMathInt.div(int256,int256) (#19-23) is never used and should be removed
SafeMathInt.mul(int256,int256) (#11-17) is never used and should be removed
SafeMathInt.sub(int256,int256) (#25-29) is never used and should be removed
Remove unused functions.

Additional information: link

Groov.totalFee (#428-431) is set pre-construction with a non-constant function or state variable:
- liquidityFee.add(treasuryFee).add(groovInsuranceFundFee).add(firePitFee)
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^0.7.4 (#5) allows old versions
solc-0.7.4 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

Function IPancakeSwapPair.DOMAIN_SEPARATOR() (#142) is not in mixedCase
Function IPancakeSwapPair.PERMIT_TYPEHASH() (#143) is not in mixedCase
Function IPancakeSwapPair.MINIMUM_LIQUIDITY() (#160) is not in mixedCase
Function IPancakeSwapRouter.WETH() (#180) is not in mixedCase
Parameter Groov.setAutoRebase(bool)._flag (#775) is not in mixedCase
Parameter Groov.setAutoAddLiquidity(bool)._flag (#784) is not in mixedCase
Parameter Groov.checkFeeExempt(address)._addr (#847) is not in mixedCase
Parameter Groov.setFeeReceivers(address,address,address,address)._autoLiquidityReceiver (#867) is not in mixedCase
Parameter Groov.setFeeReceivers(address,address,address,address)._treasuryReceiver (#868) is not in mixedCase
Parameter Groov.setFeeReceivers(address,address,address,address)._groovInsuranceFundReceiver (#869) is not in mixedCase
Parameter Groov.setFeeReceivers(address,address,address,address)._firePit (#870) is not in mixedCase
Parameter Groov.setWhitelist(address)._addr (#888) is not in mixedCase
Parameter Groov.setBotBlacklist(address,bool)._botAddress (#892) is not in mixedCase
Parameter Groov.setBotBlacklist(address,bool)._flag (#892) is not in mixedCase
Parameter Groov.setPairAddress(address)._pairAddress (#897) is not in mixedCase
Parameter Groov.setLP(address)._address (#901) is not in mixedCase
Variable Groov._name (#404) is not in mixedCase
Variable Groov._symbol (#405) is not in mixedCase
Variable Groov._decimals (#406) is not in mixedCase
Variable Groov._isFeeExempt (#409) is not in mixedCase
Variable Groov.DEAD (#434) is not in mixedCase
Variable Groov.ZERO (#435) is not in mixedCase
Variable Groov._autoRebase (#457) is not in mixedCase
Variable Groov._autoAddLiquidity (#458) is not in mixedCase
Variable Groov._initRebaseStartTime (#459) is not in mixedCase
Variable Groov._lastRebasedTime (#460) is not in mixedCase
Variable Groov._lastAddLiquidityTime (#461) is not in mixedCase
Variable Groov._totalSupply (#462) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Variable IPancakeSwapRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#185) is too similar to IPancakeSwapRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#186)
Prevent variables from having similar names.

Additional information: link

Groov.slitherConstructorVariables() (#397-921) uses literals with too many digits:
- DEAD = 0x000000000000000000000000000000000000dEaD (#434)
Groov.slitherConstructorVariables() (#397-921) uses literals with too many digits:
- ZERO = 0x0000000000000000000000000000000000000000 (#435)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

Groov.DEAD (#434) should be constant
Groov.ZERO (#435) should be constant
Groov._decimals (#406) should be constant
Groov._name (#404) should be constant
Groov._symbol (#405) should be constant
Groov.feeDenominator (#432) should be constant
Groov.firePitFee (#427) should be constant
Groov.groovInsuranceFundFee (#425) should be constant
Groov.liquidityFee (#423) should be constant
Groov.sellFee (#426) should be constant
Groov.swapEnabled (#442) should be constant
Groov.treasuryFee (#424) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (#353-356)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (#358-360)
name() should be declared external:
- ERC20Detailed.name() (#384-386)
symbol() should be declared external:
- ERC20Detailed.symbol() (#388-390)
decimals() should be declared external:
- ERC20Detailed.decimals() (#392-394)
getLiquidityBacking(uint256) should be declared external:
- Groov.getLiquidityBacking(uint256) (#878-886)
setPairAddress(address) should be declared external:
- Groov.setPairAddress(address) (#897-899)
Use the external attribute for functions never called from the contract.

Additional information: link

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

Contract has 14% buy tax and 40% sell tax.
Taxes are extremely high (over 30%)

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Average 30d PancakeSwap liquidity is less than $100. Token is either dead or inactive.

Swap operations require suspiciously high gas. Contract logic is complex and may disguise some form of scam.

Average 30d PancakeSwap volume is low.

Average 30d number of PancakeSwap swaps is low.

Token is deployed only at one blockchain

Token has only one trading pair

Unable to find token on CoinGecko

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Unable to find token on CoinMarketCap

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

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

Unable to find token contract audit

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 CoinHunt

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Unable to find code repository for the project

Token is not listed at Mobula.Finance

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

Token is marked as scam (rug pull, honeypot, phishing, etc.)

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

Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank