BitBNS Hack

TOTAL LOST $7.5M
Medium Other

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain 2022 Incident surface
Recovered - No recovery reported
All-Time Rank #361 By amount stolen
Protocol Type Yield Target category

Incident Overview

Quick Summary

BitBNS, an Indian crypto exchange, was hacked for $7.5 million on February 1, 2022, and hid the hack from users until an investigation by crypto sleuth zachxbt uncovered the incident.

Details of the Exploit

According to zachxbt, BitBNS was hacked through a vulnerability in their AWS (Amazon Web Services) cloud storage, which allowed the attacker to access the exchange's private keys and steal funds. BitBNS attempted to cover up the hack by tweeting about "system maintenance in progress" instead of disclosing the breach to users. BitBNS CEO Guarav Dahake later admitted to hiding the hack from customers at the advice of law enforcement.

However, some funds were ultimately recovered thanks to cooperation from other exchanges and law enforcement.

Incident Report

Protocol / Project BitBNS
Date of Incident
Attack Technique Other
Classification CeFi
Primary Source View Post-Mortem #1 View Post-Mortem #2

Protocol Information

Protocol Type Yield
Official Website www.bitbns.com/
Protocol Twitter/X @bitbns
Team Public / Doxxed
Source Code Unverified

Market Context at Time of Hack

Token Categories
Mineable
Protocol Links
GitHub

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 Deep understanding of other and Solidity and EVM internals
Capital Required Seed capital to cover gas and initial position setup
On-Chain Access Ability to interact with smart contracts and deploy a custom exploit contract
Protocol Analysis Identification of the exploitable vulnerability in BitBNS's contract logic - root cause: cefi
Execution Speed Precise transaction ordering and timing to exploit the vulnerability within a single atomic block
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 Other audit checklist and test coverage

If you're auditing a protocol with similar architecture to BitBNS, these are the critical security checks that could have prevented this incident (February 2022).

  • Verify all logic paths related to Other are guarded by proper access controls and input validation
  • 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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