Poloniex Hack

TOTAL LOST $126M
Critical #68 All-Time Private Key Compromised (Unknown Method) / Access Control bitcoin ethereum tron

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain bitcoin 3 chains affected
Recovered - No recovery reported
All-Time Rank #68 By amount stolen
Protocol Type CEX Target category

Incident Overview

Quick Summary

Poloniex exchange suffered a 122,981,391 USD access control exploit affecting Bitcoin, Ethereum, and Tron wallets on Nov 10, 2023.

Details of the Exploit

An attacker exploited Poloniex's wallet, withdrawing funds across Bitcoin, Ethereum, and Tron chains. The stolen assets were exchanged to native tokens and transferred to newly generated EOA addresses. Justin Sun, owner of the exchange, offered a 5% bug bounty to the hacker and gave them 7 days before involving law enforcement.

Market research platform X-explore suggests the Lazarus Group, a North Korea-backed cybercriminal entity, may be responsible.

Block Data Reference

Ethereum:

Attacker Address:

https://etherscan.io/address/0x0a5984f8…dbf9e7

Affected Address:

https://etherscan.io/address/0xa910f92a…7722ba

Malicious Transactions:

- https://etherscan.io/tx/0x686429f0…31a8a5

- https://etherscan.io/tx/0x4ecd5131…a3eca0

Bitcoin:

Attacker Address:

https://www.blockchain.com/explorer/addresses/btc/bc1qnpc7u2ha7ct9c458rrqsawylz9e9j6jvkvzttt

Affected Address:

https://www.blockchain.com/explorer/addresses/btc/1H1YS6GyCPyA5Q6rmx58UzmeeDd3wXuFpN

Malicious Transaction: https://www.blockchain.com/explorer/transactions/btc/ee4bb55722d1a89e1a0f63d9c561ea34eaa1c6e37d051437d388bce9145b4d5f

Tron:

Attacker Address:

https://tronscan.org/#/address/TKK6d1YALy8HCSoCSWWd1ZJhyC9NPPx4wa

Affected Address:

https://tronscan.org/#/address/TNCmcTdyrYKMtmE1KU2itzeCX76jGm5Not

Malicious Transaction: https://tronscan.org/#/transaction/0e972904705e54074d8e135c111fc276d87f846398b07d8a05e0515d78fd19c4

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

Incident Report

Protocol / Project Poloniex
Date of Incident
Affected Chain(s) bitcoin ethereum tron
Attack Technique Private Key Compromised (Unknown Method) / Access Control
Classification Infrastructure / CeFi
Primary Source View Post-Mortem

Protocol Information

Protocol Type CEX
Official Website poloniex.com
Protocol Twitter/X @Poloniex
Team Public / Doxxed
Source Code Unverified

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 Poloniex'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 Poloniex, these are the critical security checks that could have prevented this incident (November 2023).

  • 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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