HTX Hack

TOTAL LOST $8.0M
Medium Private Key Compromised (Unknown Method) / Access Control ethereum

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain ethereum Incident surface
Recovered $7.9M 98.9% returned
All-Time Rank #337 By amount stolen
Protocol Type CEX Target category

Incident Overview

Quick Summary

HTX Global's hot wallet was exploited, resulting in the theft of 4,999 ETH (approx. $7,902,519 USD) due to an access control vulnerability.

Details of the Exploit

On September 24, 2023, HTX, a cryptocurrency exchange platform, previously known as Huobi Global, suffered an exploit due to an access control issue. The attacker gained access to the exchange's hot wallet and withdrew 4,999 ETH, worth approximately $7,902,519 USD. The stolen ETH was transferred to the attacker's wallet in a single transaction, and 1,000 ETH was later sent to a second wallet.

As of September 27, 2023, the stolen amount remains in the provided addresses. HTX sent an on-chain message to the attacker, offering a 5% white hat bounty and disclosing their true identity. Justin Sun, CEO of HTX, announced that the exchange has fully covered the losses and resolved all related issues.

Block Data Reference

Attacker Addresses:

https://etherscan.io/address/0xdb1D7446…8AEC83

https://etherscan.io/address/0x799982b7…a9ab5E

Malicious Transaction:

https://etherscan.io/tx/0xe9eefff0…58c029

On-chain Message from HTX:

https://etherscan.io/tx/0x87f21652…7f863b

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

Incident Report

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

Protocol Information

Protocol Type CEX
Affected Token HT
Official Website www.huobi.com/en-us/
Protocol Twitter/X @HTX_Global?s=20
Team Public / Doxxed
Source Code Unverified

Market Context at Time of Hack

Token Categories
Centralized Exchange (CEX) Token Ethereum Ecosystem TRON Ecosystem BNB Chain Ecosystem Tron20 Ecosystem
Protocol Links
Discord

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 HTX'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 HTX, these are the critical security checks that could have prevented this incident (September 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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Funds Recovery

98.9%

Recovered

$7.9M

Net Loss

87999

Post-Incident Timeline

  • 2023-10-07

    The hacker returned all stolen funds

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

Proof-of-Concept Exploits

1 PoC available
poc-exploits - htx
$ HCT Price Manipulation

On-Chain Evidence & References

Sources & References

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