HK [Helkin] Token

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

Helkin.swapBack() (#394-428) sends eth to arbitrary user
Dangerous calls:
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

DividendDistributor.distributeDividend(address) (#224-234) ignores return value by BUSD.transfer(shareholder,amount) (#229)
Use SafeERC20, or ensure that the transfer/transferFrom return value is checked.

Additional information: link

Reentrancy in Helkin._transferFrom(address,address,uint256) (#345-359):
External calls:
- swapBack() (#348)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#402-408)
- distributor.deposit{value: amountBNBReflection}() (#414)
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#418-425)
- triggerAutoBuyback() (#349)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
External calls sending eth:
- swapBack() (#348)
- distributor.deposit{value: amountBNBReflection}() (#414)
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#418-425)
- triggerAutoBuyback() (#349)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
State variables written after the call(s):
- _balances[sender] = _balances[sender].sub(amount,Insufficient Balance) (#351)
- _balances[recipient] = _balances[recipient].add(amountReceived) (#353)
- amountReceived = takeFee(sender,recipient,amount) (#352)
- _balances[address(this)] = _balances[address(this)].add(feeAmount) (#384)
- triggerAutoBuyback() (#349)
- inSwap = true (#303)
- inSwap = false (#303)
Apply the check-effects-interactions pattern.

Additional information: link

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.

Combination 2: Unchecked transfer + 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.

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.

Helkin.swapBack() (#394-428) ignores return value by router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#418-425)
Ensure that all the return values of the function calls are used.

Additional information: link

Helkin._maxTxAmount (#268) is set pre-construction with a non-constant function or state variable:
- _totalSupply / 200
Helkin.swapThreshold (#301) is set pre-construction with a non-constant function or state variable:
- _totalSupply / 400
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

DividendDistributor.process(uint256) (#201-219) has costly operations inside a loop:
- currentIndex = 0 (#209)
DividendDistributor.distributeDividend(address) (#224-234) has costly operations inside a loop:
- totalDistributed = totalDistributed.add(amount) (#228)
DividendDistributor.process(uint256) (#201-219) has costly operations inside a loop:
- currentIndex ++ (#216)
Use a local variable to hold the loop computation result.

Additional information: link

Low level call in Helkin.swapBack() (#394-428):
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
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() (#85) is not in mixedCase
Parameter DividendDistributor.setDistributionCriteria(uint256,uint256)._minPeriod (#169) is not in mixedCase
Parameter DividendDistributor.setDistributionCriteria(uint256,uint256)._minDistribution (#169) is not in mixedCase
Variable DividendDistributor._token (#133) is not in mixedCase
Variable DividendDistributor.BUSD (#139) is not in mixedCase
Variable DividendDistributor.WBNB (#140) is not in mixedCase
Parameter Helkin.setAutoBuybackSettings(bool,uint256,uint256,uint256,bool)._enabled (#467) is not in mixedCase
Parameter Helkin.setAutoBuybackSettings(bool,uint256,uint256,uint256,bool)._cap (#467) is not in mixedCase
Parameter Helkin.setAutoBuybackSettings(bool,uint256,uint256,uint256,bool)._amount (#467) is not in mixedCase
Parameter Helkin.setAutoBuybackSettings(bool,uint256,uint256,uint256,bool)._period (#467) is not in mixedCase
Parameter Helkin.setAutoBuybackSettings(bool,uint256,uint256,uint256,bool)._autoBuybackMultiplier (#467) is not in mixedCase
Parameter Helkin.setFees(uint256,uint256,uint256,uint256,uint256)._liquidityFee (#507) is not in mixedCase
Parameter Helkin.setFees(uint256,uint256,uint256,uint256,uint256)._buybackFee (#507) is not in mixedCase
Parameter Helkin.setFees(uint256,uint256,uint256,uint256,uint256)._reflectionFee (#507) is not in mixedCase
Parameter Helkin.setFees(uint256,uint256,uint256,uint256,uint256)._marketingFee (#507) is not in mixedCase
Parameter Helkin.setFees(uint256,uint256,uint256,uint256,uint256)._feeDenominator (#507) is not in mixedCase
Parameter Helkin.setFeeReceivers(address,address)._autoLiquidityReceiver (#515) is not in mixedCase
Parameter Helkin.setFeeReceivers(address,address)._marketingFeeReceiver (#515) is not in mixedCase
Parameter Helkin.setSwapBackSettings(bool,uint256)._enabled (#519) is not in mixedCase
Parameter Helkin.setSwapBackSettings(bool,uint256)._amount (#519) is not in mixedCase
Parameter Helkin.setTargetLiquidity(uint256,uint256)._target (#523) is not in mixedCase
Parameter Helkin.setTargetLiquidity(uint256,uint256)._denominator (#523) is not in mixedCase
Parameter Helkin.setDistributionCriteria(uint256,uint256)._minPeriod (#531) is not in mixedCase
Parameter Helkin.setDistributionCriteria(uint256,uint256)._minDistribution (#531) is not in mixedCase
Variable Helkin.DOGE (#260) is not in mixedCase
Variable Helkin.WBNB (#261) is not in mixedCase
Variable Helkin.DEAD (#262) is not in mixedCase
Variable Helkin.ZERO (#263) is not in mixedCase
Constant Helkin._name (#264) is not in UPPER_CASE_WITH_UNDERSCORES
Constant Helkin._symbol (#265) is not in UPPER_CASE_WITH_UNDERSCORES
Constant Helkin._decimals (#266) is not in UPPER_CASE_WITH_UNDERSCORES
Variable Helkin._totalSupply (#267) is not in mixedCase
Variable Helkin._maxTxAmount (#268) is not in mixedCase
Variable Helkin._balances (#269) is not in mixedCase
Variable Helkin._allowances (#270) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Variable IDEXRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#89) is too similar to IDEXRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#90)
Prevent variables from having similar names.

Additional information: link

DividendDistributor.distributeDividend(address) (#224-234) has external calls inside a loop: BUSD.transfer(shareholder,amount) (#229)
Favor pull over push strategy for external calls.

Additional information: link

Reentrancy in DividendDistributor.distributeDividend(address) (#224-234):
External calls:
- BUSD.transfer(shareholder,amount) (#229)
State variables written after the call(s):
- shares[shareholder].totalRealised = shares[shareholder].totalRealised.add(amount) (#231)
- shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount) (#232)
Reentrancy in DividendDistributor.process(uint256) (#201-219):
External calls:
- distributeDividend(shareholders[currentIndex]) (#212)
- BUSD.transfer(shareholder,amount) (#229)
State variables written after the call(s):
- currentIndex ++ (#216)
Reentrancy in DividendDistributor.setShare(address,uint256) (#173-185):
External calls:
- distributeDividend(shareholder) (#175)
- BUSD.transfer(shareholder,amount) (#229)
State variables written after the call(s):
- shares[shareholder].amount = amount (#183)
- shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount) (#184)
Apply the check-effects-interactions pattern.

Additional information: link

DividendDistributor.setDistributionCriteria(uint256,uint256) (#169-172) should emit an event for:
- minPeriod = _minPeriod (#170)
- minDistribution = _minDistribution (#171)
Helkin.setAutoBuybackSettings(bool,uint256,uint256,uint256,bool) (#467-475) should emit an event for:
- autoBuybackCap = _cap (#469)
- autoBuybackAmount = _amount (#471)
Helkin.setBuybackMultiplierSettings(uint256,uint256,uint256) (#476-481) should emit an event for:
- buybackMultiplierNumerator = numerator (#478)
- buybackMultiplierDenominator = denominator (#479)
- buybackMultiplierLength = length (#480)
Helkin.setTxLimit(uint256) (#488-491) should emit an event for:
- _maxTxAmount = amount (#490)
Helkin.setFees(uint256,uint256,uint256,uint256,uint256) (#507-514) should emit an event for:
- liquidityFee = _liquidityFee (#508)
- reflectionFee = _reflectionFee (#510)
- marketingFee = _marketingFee (#511)
- totalFee = _liquidityFee.add(_buybackFee).add(_reflectionFee).add(_marketingFee) (#512)
- feeDenominator = _feeDenominator (#513)
Helkin.setSwapBackSettings(bool,uint256) (#519-522) should emit an event for:
- swapThreshold = _amount (#521)
Helkin.setTargetLiquidity(uint256,uint256) (#523-526) should emit an event for:
- targetLiquidity = _target (#524)
- targetLiquidityDenominator = _denominator (#525)
Emit an event for critical parameter changes.

Additional information: link

Auth.transferOwnership(address).adr (#73) lacks a zero-check on :
- owner = adr (#74)
Helkin.setFeeReceivers(address,address)._autoLiquidityReceiver (#515) lacks a zero-check on :
- autoLiquidityReceiver = _autoLiquidityReceiver (#516)
Helkin.setFeeReceivers(address,address)._marketingFeeReceiver (#515) lacks a zero-check on :
- marketingFeeReceiver = _marketingFeeReceiver (#517)
Check that the address is not zero.

Additional information: link

Reentrancy in Helkin._transferFrom(address,address,uint256) (#345-359):
External calls:
- swapBack() (#348)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#402-408)
- distributor.deposit{value: amountBNBReflection}() (#414)
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#418-425)
- triggerAutoBuyback() (#349)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
External calls sending eth:
- swapBack() (#348)
- distributor.deposit{value: amountBNBReflection}() (#414)
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#418-425)
- triggerAutoBuyback() (#349)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
State variables written after the call(s):
- triggerAutoBuyback() (#349)
- buybackMultiplierTriggeredAt = block.timestamp (#449)
- launch() (#350)
- launchedAt = block.number (#486)
Reentrancy in Helkin.constructor() (#304-319):
External calls:
- pair = IDEXFactory(router.factory()).createPair(WBNB,address(this)) (#306)
State variables written after the call(s):
- _allowances[address(this)][address(router)] = type()(uint256).max (#307)
- _balances[_presaler] = _totalSupply (#317)
- autoLiquidityReceiver = msg.sender (#315)
- distributor = new DividendDistributor(address(router)) (#308)
- isDividendExempt[pair] = true (#312)
- isDividendExempt[address(this)] = true (#313)
- isDividendExempt[DEAD] = true (#314)
- isFeeExempt[_presaler] = true (#310)
- isTxLimitExempt[_presaler] = true (#311)
- marketingFeeReceiver = msg.sender (#316)
Reentrancy in DividendDistributor.deposit() (#186-200):
External calls:
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: msg.value}(0,path,address(this),block.timestamp) (#191-196)
State variables written after the call(s):
- dividendsPerShare = dividendsPerShare.add(dividendsPerShareAccuracyFactor.mul(amount).div(totalShares)) (#199)
- totalDividends = totalDividends.add(amount) (#198)
Reentrancy in DividendDistributor.distributeDividend(address) (#224-234):
External calls:
- BUSD.transfer(shareholder,amount) (#229)
State variables written after the call(s):
- shareholderClaims[shareholder] = block.timestamp (#230)
Reentrancy in DividendDistributor.setShare(address,uint256) (#173-185):
External calls:
- distributeDividend(shareholder) (#175)
- BUSD.transfer(shareholder,amount) (#229)
State variables written after the call(s):
- addShareholder(shareholder) (#178)
- shareholderIndexes[shareholder] = shareholders.length (#249)
- removeShareholder(shareholder) (#180)
- shareholderIndexes[shareholders[shareholders.length - 1]] = shareholderIndexes[shareholder] (#254)
- addShareholder(shareholder) (#178)
- shareholders.push(shareholder) (#250)
- removeShareholder(shareholder) (#180)
- shareholders[shareholderIndexes[shareholder]] = shareholders[shareholders.length - 1] (#253)
- shareholders.pop() (#255)
- totalShares = totalShares.sub(shares[shareholder].amount).add(amount) (#182)
Reentrancy in Helkin.triggerAutoBuyback() (#446-455):
External calls:
- buyTokens(autoBuybackAmount,DEAD) (#447)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
State variables written after the call(s):
- autoBuybackAccumulator = autoBuybackAccumulator.add(autoBuybackAmount) (#453)
- autoBuybackBlockLast = block.number (#452)
- autoBuybackEnabled = false (#454)
- buybackMultiplierTriggeredAt = block.timestamp (#449)
Reentrancy in Helkin.triggerManualBuyback(uint256,bool) (#436-442):
External calls:
- buyTokens(amount,DEAD) (#437)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
State variables written after the call(s):
- buybackMultiplierTriggeredAt = block.timestamp (#439)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in Helkin._transferFrom(address,address,uint256) (#345-359):
External calls:
- swapBack() (#348)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#402-408)
- distributor.deposit{value: amountBNBReflection}() (#414)
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#418-425)
- triggerAutoBuyback() (#349)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
External calls sending eth:
- swapBack() (#348)
- distributor.deposit{value: amountBNBReflection}() (#414)
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#418-425)
- triggerAutoBuyback() (#349)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
Event emitted after the call(s):
- BuybackMultiplierActive(buybackMultiplierLength) (#450)
- triggerAutoBuyback() (#349)
- Transfer(sender,address(this),feeAmount) (#385)
- amountReceived = takeFee(sender,recipient,amount) (#352)
Reentrancy in Helkin._transferFrom(address,address,uint256) (#345-359):
External calls:
- swapBack() (#348)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#402-408)
- distributor.deposit{value: amountBNBReflection}() (#414)
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#418-425)
- triggerAutoBuyback() (#349)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
- distributor.setShare(sender,_balances[sender]) (#354)
- distributor.setShare(recipient,_balances[recipient]) (#355)
- distributor.process(distributorGas) (#356)
External calls sending eth:
- swapBack() (#348)
- distributor.deposit{value: amountBNBReflection}() (#414)
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#418-425)
- triggerAutoBuyback() (#349)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
Event emitted after the call(s):
- Transfer(sender,recipient,amountReceived) (#357)
Reentrancy in Helkin.constructor() (#304-319):
External calls:
- pair = IDEXFactory(router.factory()).createPair(WBNB,address(this)) (#306)
Event emitted after the call(s):
- Transfer(address(0),_presaler,_totalSupply) (#318)
Reentrancy in Helkin.swapBack() (#394-428):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#402-408)
- distributor.deposit{value: amountBNBReflection}() (#414)
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#418-425)
External calls sending eth:
- distributor.deposit{value: amountBNBReflection}() (#414)
- (success) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#415)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#418-425)
Event emitted after the call(s):
- AutoLiquify(amountBNBLiquidity,amountToLiquify) (#426)
Reentrancy in Helkin.triggerAutoBuyback() (#446-455):
External calls:
- buyTokens(autoBuybackAmount,DEAD) (#447)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
Event emitted after the call(s):
- BuybackMultiplierActive(buybackMultiplierLength) (#450)
Reentrancy in Helkin.triggerManualBuyback(uint256,bool) (#436-442):
External calls:
- buyTokens(amount,DEAD) (#437)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#460-465)
Event emitted after the call(s):
- BuybackMultiplierActive(buybackMultiplierLength) (#440)
Apply the check-effects-interactions pattern.

Additional information: link

DividendDistributor.shouldDistribute(address) (#220-223) uses timestamp for comparisons
Dangerous comparisons:
- shareholderClaims[shareholder] + minPeriod < block.timestamp && getUnpaidEarnings(shareholder) > minDistribution (#221-222)
Helkin._transferFrom(address,address,uint256) (#345-359) uses timestamp for comparisons
Dangerous comparisons:
- require(bool)(_balances[sender] > 0) (#350)
Helkin.getTotalFee(bool) (#372-376) uses timestamp for comparisons
Dangerous comparisons:
- selling && buybackMultiplierTriggeredAt.add(buybackMultiplierLength) > block.timestamp (#374)
Helkin.shouldSwapBack() (#388-393) uses timestamp for comparisons
Dangerous comparisons:
- msg.sender != pair && ! inSwap && swapEnabled && _balances[address(this)] >= swapThreshold (#389-392)
Helkin.isOverLiquified(uint256,uint256) (#550-552) uses timestamp for comparisons
Dangerous comparisons:
- getLiquidityBacking(accuracy) > target (#551)
Avoid relying on block.timestamp.

Additional information: link

Helkin.slitherConstructorVariables() (#258-556) uses literals with too many digits:
- DEAD = 0x000000000000000000000000000000000000dEaD (#262)
Helkin.slitherConstructorVariables() (#258-556) uses literals with too many digits:
- ZERO = 0x0000000000000000000000000000000000000000 (#263)
Helkin.slitherConstructorVariables() (#258-556) uses literals with too many digits:
- distributorGas = 500000 (#299)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

Helkin.DOGE (#260) is never used in Helkin (#258-556)
Remove unused state variables.

Additional information: link

DividendDistributor.WBNB (#140) should be constant
DividendDistributor.dividendsPerShareAccuracyFactor (#150) should be constant
Helkin.DEAD (#262) should be constant
Helkin.DOGE (#260) should be constant
Helkin.WBNB (#261) should be constant
Helkin.ZERO (#263) should be constant
Helkin._totalSupply (#267) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

authorize(address) should be declared external:
- Auth.authorize(address) (#61-63)
unauthorize(address) should be declared external:
- Auth.unauthorize(address) (#64-66)
transferOwnership(address) should be declared external:
- Auth.transferOwnership(address) (#73-77)
getUnpaidEarnings(address) should be declared external:
- Helkin.getUnpaidEarnings(address) (#537-539)
Use the external attribute for functions never called from the contract.

Additional information: link

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

Average 30d number of PancakeSwap swaps is less than 1. Token is either dead or inactive.

Token is deployed only at one blockchain

Contract has 6% buy tax and 7% sell tax.
Taxes are low and contract ownership is renounced.

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 audit link on the website

Unable to find whitepaper link on the website

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

Young tokens have high risks of price dump / death

Young tokens have high risks of price dump / death

Young tokens have high risks of price dump / death

Token has relatively low CoinGecko rank

Token has relatively low CoinMarketCap rank