Biki Hack

TOTAL LOST $123K
Low Access Control

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain 2019 Incident surface
Recovered - No recovery reported
All-Time Rank #1425 By amount stolen
Protocol Type Exploit/Access control Target category

Incident Overview

Biki.com, a crypto asset exchange established in Singapore, stated in the announcement that the exchange underwent a Verification code attack between midnight and 7:30 on the 25th, and some user accounts and passwords were tampered with. The company has closed all withdrawals and OTC transactions.

Biki said they would offer a reasonable compensation plan as soon as the damage situation was confirmed.

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

Incident Report

Protocol / Project Biki
Date of Incident
Attack Technique Access Control
Classification CeFi
Primary Source View Post-Mortem #1 View Post-Mortem #2

Protocol Information

Protocol Type Exploit/Access control
Affected Token BIKI
Official Website www.biki.com/
Protocol Twitter/X @BiKiEnglish
Team Anonymous
Source Code Unverified

Market Context at Time of Hack

Token Categories
DeFi Ethereum Ecosystem
Protocol Links
GitHub 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 Biki'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? Likely — with a thorough Access Control audit checklist and test coverage

If you're auditing a protocol with similar architecture to Biki, these are the critical security checks that could have prevented this incident (March 2019).

  • Verify all logic paths related to 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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