The NORMIE and BOGE token exploits of late May 2024, which collectively destroyed millions in market capitalization through identical smart contract vulnerabilities, underscore the necessity of technical due diligence before committing funds to any token project. With Bitcoin at $69,394 and Ethereum at $3,892, the broader market was distracted by ETF approvals — a reminder that exploitative attacks often coincide with periods of reduced scrutiny. This guide walks through the technical process of evaluating a token smart contract for common vulnerabilities.
The Objective
This tutorial teaches you how to independently verify the security of an ERC-20 token contract on Ethereum or EVM-compatible networks like Base. By the end, you will be able to identify the type of access control vulnerability that enabled the NORMIE and BOGE exploits, assess the overall attack surface of a contract, and make informed decisions about whether a contract meets an acceptable risk threshold.
Prerequisites
You need a basic understanding of blockchain addresses and transactions, familiarity with a block explorer like Etherscan or BaseScan, and optionally, a local development environment with Foundry or Hardhat for deeper analysis. No programming experience is required for the initial verification steps, though Solidity knowledge will help with advanced techniques.
Step-by-Step Walkthrough
Step 1: Locate the contract address. Find the token contract address from the project’s official website or a trusted data aggregator like CoinMarketCap. Never use addresses from social media posts or unsolicited messages. Verify the address appears on the project’s official domain and cross-reference it with the block explorer.
Step 2: Check verification status. Navigate to the contract address on the appropriate block explorer (Etherscan for Ethereum, BaseScan for Base). Look for a green checkmark indicating the contract source code has been verified. If the code is not verified — as was the case with the BOGE exploit contract — this is an immediate red flag. Unverified code means the community cannot audit what the contract actually does.
Step 3: Review the contract source code. Once verified, examine the code for access control patterns. Look for functions that modify token supply, particularly those with names like mint, burn, or setBalance. Check what authorization these functions require. If you see conditions like balanceOf(msg.sender) == balanceOf(deployer) — which was the exact vulnerability in the NORMIE exploit — the contract has a critical flaw.
Step 4: Analyze ownership and privilege patterns. Use the block explorer’s Read Contract tab to check the contract’s owner. If the contract has an owner with unlimited minting authority, the project team can create tokens at will. Check whether ownership has been renounced — look for a function like renounceOwnership in the transaction history. An active owner means centralized control over token supply.
Step 5: Inspect transaction history for suspicious activity. Review the contract’s recent transactions for unusual patterns. Large token movements from unknown addresses, frequent calls to internal functions, or transactions involving unverified helper contracts can indicate ongoing exploitation or backdoor activity. The BOGE exploit involved over 120 transactions in rapid succession — a pattern visible to anyone monitoring the contract.
Step 6: Cross-reference with security tools. Run the contract address through automated security scanners. TokenSniffer analyzes contracts for common exploits including honeypots, hidden mints, and unsafe ownership patterns. GoPlus Security provides a comprehensive API for programmatic contract analysis. These tools generate risk scores based on known vulnerability patterns, providing a quantitative complement to your manual review.
Troubleshooting
If you encounter an unverified contract, do not assume it is safe simply because others are trading it. Request verification from the project team through official channels. Legitimate projects typically verify their contracts promptly after deployment. Continued operation of unverified contracts should be treated as a warning sign.
If automated security tools return conflicting assessments, prioritize the most conservative evaluation. Different tools use different detection heuristics, and a vulnerability flagged by one tool but not another may still be genuine. When in doubt, err on the side of caution.
If you identify a potential vulnerability in a contract you are already invested in, immediately assess your exposure and consider exiting your position. Report the finding to the project team and relevant security communities. Early disclosure can prevent significant losses for the broader community.
Mastering the Skill
Advanced practitioners should install Foundry, a Solidity development framework, and use its static analysis tools to perform deeper contract inspection. Foundry’s forge inspect command can extract storage layouts, function signatures, and inheritance chains from verified contracts, providing comprehensive visibility into contract architecture.
For professional-level analysis, learn to write exploit PoCs (proofs of concept) that demonstrate how vulnerabilities can be triggered. Developing this skill requires Solidity proficiency but provides the deepest understanding of contract security. Resources like Damn Vulnerable DeFi and Capture the Ether offer practice environments for honing exploit development skills ethically.
Stay current with security research by following publications from Trail of Bits, Consensys Diligence, and the Solidity blog. The vulnerability landscape evolves constantly, and techniques that are safe today may become dangerous as new attack patterns emerge. Continuous learning is the only sustainable approach to smart contract security.
Disclaimer: This article is for informational purposes only and does not constitute financial or investment advice. Always conduct your own research before engaging with any cryptocurrency project.
this is actually useful content. bookmarking for the next time i consider buying anything below top 200. the access control checklist is solid
the NORMIE exploit was identical to a vulnerability documented on solodmy years prior. teams just dont bother checking known attack vectors
NORMIE and BOGE had the exact same vulnerability. copy-paste devs copying copy-paste code. the circle of degen life
agreed. most people skip straight to the whitepaper and ignore the contract entirely. this should be required reading before any degen play
whitepaper tells you what they want to do, the contract tells you what actually happens. should be mandatory reading tbh
mandatory reading for who though? the people buying NORMIE at ath cant read solidity. they see green candle and ape
the access control checklist is clutch. most of these degen tokens have owner functions that can mint unlimited supply and nobody checks
bookmarking the access control checklist. most retail investors do not even know what a require statement is