EasyFi Hack

TOTAL LOST $59.0M
High #112 All-Time Private Key Compromised (Unknown Method) / Access Control ethereum polygon

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain ethereum 2 chains affected
Recovered - No recovery reported
All-Time Rank #112 By amount stolen
Protocol Type Exploit/Access control Target category

Incident Overview

Quick Summary

EasyFi project's admin keys and mnemonics were stolen during the sophisticated remote attack. The hacker used keys to stole user's deposits in several protocol pools.

Details of the Exploit

The admin keys of the contract deployer were compromised by the attacker remotely. The attacker withdrew the user's deposits from the protocol pools, namely from the USDT/USDC/Matic/ETH/DAI markets. In addition, around 2.98 Million EASY were stolen from the protocol's contracts.

EasyFi smart contracts were not exploited. The hacker used renBTC and WBTC to move the funds via the dark pool to hide the traces.

Block Data Reference

The attacker's address:

https://etherscan.io/address/0x83a2EB63…9d8B37

Transaction:

https://bloxy.info/txs/transfers_to/0x83a2eb63…9d8b37?currency_id=548460

This is classified as a Access Control Attacks . Compare similar hacks →

Incident Report

Protocol / Project EasyFi
Date of Incident
Affected Chain(s) ethereum polygon
Attack Technique Private Key Compromised (Unknown Method) / Access Control
Classification Infrastructure / Borrowing and Lending
Primary Source View Post-Mortem

Protocol Information

Protocol Type Exploit/Access control
Affected Token EASY
Official Website easyfi.network/
Protocol Twitter/X @EasyfiNetwork
Team Anonymous
Source Code Unverified

Market Context at Time of Hack

Token Categories
Ethereum Ecosystem Polygon Ecosystem BNB Chain Ecosystem
Protocol Links
GitHub Discord Reddit

What the Attacker Needed to Succeed

Understanding the prerequisites for this type of attack helps auditors identify protocols that are most at risk and helps developers build better defenses.

Technical Knowledge Operational-security tradecraft (phishing, malware, leaked seed phrases, or insider access) to obtain treasury signing authority
Capital Required Minimal capital - only enough to cover gas while draining the compromised accounts
On-Chain Access Valid signing authority over the compromised wallets / multisig signers, allowing direct transfer of funds or stake authorization
Target Reconnaissance Identification of EasyFi's high-value treasury accounts and the authority / multisig structure controlling them
Execution Speed Speed to drain the compromised accounts before the team detects the breach and revokes signing authority or freezes the assets
Obfuscation Plan A strategy to launder and move stolen funds - typically through mixers, cross-chain bridges, or decentralized DEX swaps to resist tracing

What Auditors Should Check

Could this have been caught in audit? Hard to catch — private key / OpSec failures are outside smart contract audit scope

If you're auditing a protocol with similar architecture to EasyFi, these are the critical security checks that could have prevented this incident (April 2021).

  • Verify all logic paths related to Private Key Compromised (Unknown Method) / Access Control are guarded by proper access controls and input validation - see the Access Control Attacks attack class for patterns
  • Review privileged functions (owner, admin, governance) for potential abuse vectors - centralization risks should be documented and bounded with timelocks or multi-sigs

Master these auditing techniques with hands-on labs and real exploit scenarios in the Smart Contract Hacking course.

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Related Attack Classes

The technique used in this hack maps to these vulnerability classes in our security curriculum:

See all Access Control Attacks examples →

Access Control Attacks

Sources & References

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