Malicious Upgrade Pattern Detector

WHAT IT DOES

Malicious Upgrade Pattern Detector reads live on-chain data from any EVM proxy contract and uses AI to detect malicious upgrade patterns, backdoor implementations, hidden administrator capabilities, and upgrade abuse vectors. It examines the proxy's bytecode and implementation address through standard storage slots. It analyzes upgrade function signatures including upgradeTo(), upgradeToAndCall(), setImplementation(), and upgrade(). It scans for dangerous opcode patterns in the implementation such as selfdestruct, delegatecall to arbitrary addresses, and callcode. It detects storage collision risks between implementation versions. It identifies upgrade transaction frequency and history to spot rapid or suspicious upgrade patterns. It analyzes admin address type—EOA (externally owned account), multisig, or timelock—to assess upgrade control security. The AI generates a plain-language verdict—SAFE, RISKY, or CRITICAL—along with specific explanations of the malicious upgrade risks before you interact with or invest in the proxy contract.

HOW TO USE

Paste any EVM proxy contract address into the input field. The tool reads the contract's bytecode and queries standard proxy storage slots to identify the current implementation address and proxy admin. It scans bytecode for upgrade function signatures using 4-byte method identifiers—upgradeTo() (0x3659cfe6), upgradeToAndCall() (0x4f1ef286), setImplementation() (0x51cff8d9), and upgrade() (0x5c60da1b). It analyzes the implementation bytecode for selfdestruct, delegatecall, and other dangerous opcodes. It detects storage collision patterns and function selector collisions. The AI receives all this data and returns a verdict: SAFE (multisig or timelock controlled with verified implementation, no dangerous patterns), RISKY (single-admin upgrade capability, implementation has suspicious patterns), or CRITICAL (upgradeToAndCall allows arbitrary code execution, selfdestruct in implementation, storage collisions, or unverified implementation with multiple upgrade risks). The AI also provides a detailed plain-language explanation of the specific malicious upgrade risks and who controls them.

STORAGE SLOT READING, BYTECODE ANALYSIS, AND PATTERN DETECTION

The tool reads the proxy's implementation address from the standard EIP-1967 storage slot and the admin address from the admin slot. It also attempts alternate storage slots for non-standard proxy patterns. It scans the proxy bytecode for common proxy implementation patterns including the fallback function with delegatecall. It identifies upgrade function signatures in the bytecode to determine upgrade capability. It analyzes the implementation bytecode for selfdestruct (0xff), delegatecall (0xf4), and callcode (0xf2) opcodes that enable dangerous behavior. It detects storage collision vulnerabilities by comparing storage slot usage between implementation versions. It identifies function selector collisions where multiple functions share the same signature, potentially hiding malicious functionality. It also checks whether the admin address is an EOA, which represents the highest risk because a single wallet can upgrade the contract without any delay or oversight. If the implementation is not verified on a block explorer, this is flagged as a risk since users cannot independently verify the code.

WHAT IT CANNOT SEE

This tool cannot detect off-chain governance decisions or upgrade intent—a proxy could have perfect on-chain security but be controlled by a malicious team off-chain. It cannot analyze bytecode that is obfuscated beyond EVM disassembly limits. It cannot verify if a proposed implementation is safe without source code—it can only detect dangerous opcode patterns, not logical vulnerabilities. It cannot detect upgrade risks that depend on off-chain conditions or specific block timing. It cannot predict future upgrade behavior or intentions. It cannot detect upgrade mechanisms that use non-standard proxy patterns or custom implementations that do not follow EIP-1967 standards. It cannot see pending upgrade transactions not yet in the mempool. It cannot verify that a timelock, if present, has not been bypassed through an upgrade to the proxy itself.

PLEASE NOTE

EVM chains only. This tool reads on-chain data and generates AI explanations—it does NOT sign transactions or execute any on-chain actions. The wallet's own signature prompt remains the final gate for every real action. Always review the exact transaction details in your wallet before approving any contract interaction. The AI assessment is informational only and does not constitute financial or security advice. Always verify proxy upgrade details independently through block explorers and official project documentation before assuming any proxy contract is safe to interact with.