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Advanced Manual
Smart Contract Audit

June 4, 2022

Audit requested by

Football Move

0x1F461B82234b70b44780bb21C8D97456161EBCD7

Football Move / Security Audit

Table of Contents

1. Audit Summary

1.1 Audit scope

1.2 Tokenomics

1.3 Source Code

2. Disclaimer

3. Global Overview

3.1 Informational issues

3.2 Low-risk issues

3.3 Medium-risk issues

3.4 High-risk issues

4. Vulnerabilities Findings

5. Contract Privileges

5.1 Maximum Fee Limit Check

5.2 Contract Pausability Check

5.3 Max Transaction Amount Check

5.4 Exclude From Fees Check

5.5 Ability to Mint Check

5.6 Ability to Blacklist Check

5.7 Owner Privileges Check

6. Notes

6.1 Notes by Coinsult

6.2 Notes by Football Move

7. Contract Snapshot

8. Website Review

9. Certificate of Proof

Football Move / Security Audit

Audit Summary

Audit Scope

Project Name

Football Move

Blockchain

Binance Smart Chain

Smart Contract Language

Solidity

Contract Address

0x1F461B82234b70b44780bb21C8D97456161EBCD7

Audit Method

Static Analysis, Manual Review

Date of Audit

4 June 2022

This audit report has been prepared by Coinsult’s experts at the request of the client. In this audit, the results of the static analysis and the manual code review will be presented. The purpose of the audit is to see if the functions work as intended, and to identify potential security issues within the smart contract.

The information in this report should be used to understand the risks associated with the smart contract. This report can be used as a guide for the development team on how the contract could possibly be improved by remediating the issues that were identified.

Football Move / Security Audit

Tokenomics

Rank Address Quantity (Token) Percentage
1 Null Address: 0x000…dEaD 25,000,000 50.0000%
2  0xc57235cf7cc2ecd029355d19b0f11a0f64efddce 12,500,355 25.0007%
3  0x407993575c91ce7643a4d4ccacc9a98c36ee1bbe 12,499,645 24.9993%

Source Code

Coinsult was comissioned by Football Move to perform an audit based on the following code:
https://bscscan.com/address/0x1F461B82234b70b44780bb21C8D97456161EBCD7#code

✅ Ownership Renounced Jun-08-2022 07:59:37 AM +UTC

https://bscscan.com/tx/0x1b89a45c448dd64477684f829608422ac9a870e3111c59e58a20b36a2e3729fe

Football Move / Security Audit

Disclaimer

This audit report has been prepared by Coinsult’s experts at the request of the client. In this audit, the results of the static analysis and the manual code review will be presented. The purpose of the audit is to see if the functions work as intended, and to identify potential security issues within the smart contract.

The information in this report should be used to understand the risks associated with the smart contract. This report can be used as a guide for the development team on how the contract could possibly be improved by remediating the issues that were identified.

Coinsult is not responsible if a project turns out to be a scam, rug-pull or honeypot. We only provide a detailed analysis for your own research.

Coinsult is not responsible for any financial losses. Nothing in this contract audit is financial advice, please do your own research.

The information provided in this audit is for informational purposes only and should not be considered investment advice. Coinsult does not endorse, recommend, support or suggest to invest in any project. 

Coinsult can not be held responsible for when a project turns out to be a rug-pull, honeypot or scam.

Football Move / Security Audit

Global Overview

Manual Code Review

In this audit report we will highlight the following issues:

Vulnerability Level

Total

Pending

Acknowledged

Resolved

0

0

0

0

4

0

0

0

1

0

0

0

0

0

0

0

Privilege Overview

Coinsult checked the following privileges:

Contract Privilege

Description

Owner can mint?

Owner can blacklist?

Owner can set fees > 25%?

Owner can exclude from fees?

Owner can pause trading?

Owner can set Max TX amount?

More owner priviliges are listed later in the report.

Football Move / Security Audit

Avoid relying on block.timestamp

block.timestamp can be manipulated by miners.

				
					function _transfer(
    address sender,
    address receiver,
    uint256 amount
  ) internal virtual override {
    require(
      receiver != address(this),
      string("No transfers to contract allowed.")
    );

    require(!isBlacklist[sender], "User blacklisted");
    
    uint256 taxAmount = 0;

    if (liquidityPool[sender] == true) {
      //It's an LP Pair and it's a buy
      taxAmount = (amount * buyTax) / MAX_PERCENT;
    } else if (liquidityPool[receiver] == true) {
      //It's an LP Pair and it's a sell
      taxAmount = (amount * sellTax) / MAX_PERCENT;

      uint256 transactionTime = block.timestamp;
      require(
        lastTrade[sender]  0) {
      super._transfer(sender, marketingPool, taxAmount);
    }
    super._transfer(sender, receiver, amount - taxAmount);
  }
}
				
			

Recommendation

Do not use block.timestampnow or blockhash as a source of randomness

Exploit scenario

				
					contract Game {

    uint reward_determining_number;

    function guessing() external{
      reward_determining_number = uint256(block.blockhash(10000)) % 10;
    }
}
				
			

Eve is a miner. Eve calls guessing and re-orders the block containing the transaction. As a result, Eve wins the game.

Football Move / Security Audit

No zero address validation for some functions

Detect missing zero address validation.

				
					function setMarketingPool(address _marketingPool) external onlyOwner {
    marketingPool = _marketingPool;
    emit ChangeMarketingPool(_marketingPool);
  }
				
			

Recommendation

Check that the new address is not zero.

Exploit scenario

				
					contract C {

  modifier onlyAdmin {
    if (msg.sender != owner) throw;
    _;
  }

  function updateOwner(address newOwner) onlyAdmin external {
    owner = newOwner;
  }
}
				
			

Bob calls updateOwner without specifying the newOwner, soBob loses ownership of the contract.

Football Move / Security Audit

Conformance to Solidity naming conventions

Allow _ at the beginning of the mixed_case match for private variables and unused parameters.

				
					function setBlacklist(address _wallet, bool _status) external onlyOwner {
    isBlacklist[_wallet] = _status;
    emit ChangeBlacklist(_wallet, _status);
  }
				
			

Recommendation

Follow the Solidity naming convention.

Rule exceptions

  • Allow constant variable name/symbol/decimals to be lowercase (ERC20).
  • Allow _ at the beginning of the mixed_case match for private variables and unused parameters.

Football Move / Security Audit

Redundant Statements

Detect the usage of redundant statements that have no effect.

				
					function _msgData() internal view returns (bytes memory) {
    this;
    return msg.data;
  }
				
			

Recommendation

Remove redundant statements if they congest code but offer no value.

Exploit scenario

				
					contract RedundantStatementsContract {

    constructor() public {
        uint; // Elementary Type Name
        bool; // Elementary Type Name
        RedundantStatementsContract; // Identifier
    }

    function test() public returns (uint) {
        uint; // Elementary Type Name
        assert; // Identifier
        test; // Identifier
        return 777;
    }
}
				
			

Each commented line references types/identifiers, but performs no action with them, so no code will be generated for such statements and they can be removed.

double variable type specification
				
					require(
      receiver != address(this),
      string("No transfers to contract allowed.")
    );
				
			

Recommendation

Leave out the string() type specification

Football Move / Security Audit

Contract Privileges

Maximum Fee Limit Check

Coinsult tests if the owner of the smart contract can set the transfer, buy or sell fee to 25% or more. It is bad practice to set the fees to 25% or more, because owners can prevent healthy trading or even stop trading when the fees are set too high. 

Type of fee

Description

Transfer fee

Buy fee

Sell fee

Type of fee

Description

Max transfer fee

Max buy fee

Max sell fee

Football Move / Security Audit

Contract Pausability Check

Coinsult tests if the owner of the smart contract has the ability to pause the contract. If this is the case, users can no longer interact with the smart contract; users can no longer trade the token.

Privilege Check

Description

Can owner pause the contract?

Football Move / Security Audit

Max Transaction Amount Check

Coinsult tests if the owner of the smart contract can set the maximum amount of a transaction. If the transaction exceeds this limit, the transaction will revert. Owners could prevent normal transactions to take place if they abuse this function.

Privilege Check

Description

Can owner set max tx amount?

Football Move / Security Audit

Exclude From Fees Check

Coinsult tests if the owner of the smart contract can exclude addresses from paying tax fees. If the owner of the smart contract can exclude from fees, they could set high tax fees and exclude themselves from fees and benefit from 0% trading fees. However, some smart contracts require this function to exclude routers, dex, cex or other contracts / wallets from fees.

Privilege Check

Description

Can owner exclude from fees?

Football Move / Security Audit

Ability To Mint Check

Coinsult tests if the owner of the smart contract can mint new tokens. If the contract contains a mint function, we refer to the token’s total supply as non-fixed, allowing the token owner to “mint” more tokens whenever they want.

A mint function in the smart contract allows minting tokens at a later stage. A method to disable minting can also be added to stop the minting process irreversibly.

Minting tokens is done by sending a transaction that creates new tokens inside of the token smart contract. With the help of the smart contract function, an unlimited number of tokens can be created without spending additional energy or money.

Privilege Check

Description

Can owner mint?

Football Move / Security Audit

Ability To Blacklist Check

Coinsult tests if the owner of the smart contract can blacklist accounts from interacting with the smart contract. Blacklisting methods allow the contract owner to enter wallet addresses which are not allowed to interact with the smart contract. 

This method can be abused by token owners to prevent certain / all holders from trading the token. However, blacklists might be good for tokens that want to rule out certain addresses from interacting with a smart contract.

Privilege Check

Description

Can owner blacklist?

Football Move / Security Audit

Other Owner Privileges Check

Coinsult lists all important contract methods which the owner can interact with.

⚠ Owner can set trade cooldown

✅ Ownership Renounced Jun-08-2022 07:59:37 AM +UTC

https://bscscan.com/tx/0x1b89a45c448dd64477684f829608422ac9a870e3111c59e58a20b36a2e3729fe

Football Move / Security Audit

Notes

Notes by Football Move

No notes provided by the team.

Notes by Coinsult

✅ Ownership Renounced Jun-08-2022 07:59:37 AM +UTC

https://bscscan.com/tx/0x1b89a45c448dd64477684f829608422ac9a870e3111c59e58a20b36a2e3729fe

Football Move / Security Audit

Contract Snapshot

This is how the constructor of the contract looked at the time of auditing the smart contract.

				
					contract SuperToken is BEP20Detailed, BEP20 {
  
  uint256 constant private MAX_PERCENT = 100;

  mapping(address => bool) private isBlacklist;
  mapping(address => bool) private liquidityPool;
  mapping(address => bool) private whitelistTax;
  mapping(address => uint256) private lastTrade;

  uint8 private buyTax;
  uint8 private sellTax;
  uint8 private tradeCooldown;
  uint8 private transferTax;
  //uint256 private taxAmount;
				
			

Football Move / Security Audit

Website Review

Coinsult checks the website completely manually and looks for visual, technical and textual errors. We also look at the security, speed and accessibility of the website. In short, a complete check to see if the website meets the current standard of the web development industry. 

Type of check

Description

Mobile friendly?

Contains jQuery errors?

Is SSL secured?

Contains spelling errors?

Football Move / Security Audit

Certificate of Proof

Football Move

Audited by Coinsult.net

Date: 4 June 2022

Coinsult

coinsult.net

End of report
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