How much was lost in the Banksy hack?

The Banksy hack resulted in $5K in losses on September 04, 2021.

What attack technique was used in the Banksy exploit?

The Banksy exploit utilized Rugpull. Understanding this attack vector is critical for smart contract auditors and developers building secure DeFi protocols.

How can developers prevent similar smart contract attacks?

Preventing smart contract hacks requires a combination of secure coding practices, thorough security audits, and understanding common attack vectors like reentrancy, oracle manipulation, and access control flaws. Smart Contract Hacking (SCH) provides hands-on training to help developers and auditors identify and prevent vulnerabilities before deployment.

Banksy Hack

TOTAL LOST $5K

Low Sep 04, 2021 Rugpull

Affected Chain 2021 Incident surface

Recovered - No recovery reported

All-Time Rank #1976 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

A user claimed on Twitter that he had mistakenly entered an NFT auction scam and was taken away by an art website worth $336K dollars in Ethereum.

The hacker returned 100 ETH in full. In this scam, the victim reported that he inquired about the NFT auction from a certain Discord chat, and then he thought he was lucky enough to win the bid for the first NFT on the website and paid 100 ETH (about $336K) for this.

According to a BBC report, a hacker exploited a security hole in the artist Banksy's website and set up a web page (banksy.co.uk/NFT) to sell NFT tokens. In the end, although the hacker returned the money, the user still lost $5,000 in transaction fees.

Incident Report

Protocol / Project Banksy

Date of Incident September 04, 2021

Attack Technique Rugpull

Classification NFT

Primary Source View Post-Mortem

Protocol Information

Protocol Type Exit Scam/Rugpull

Official Website banksy.co.uk/

Team Anonymous

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 Deep understanding of rugpull 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 Banksy's contract logic - root cause: nft

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? Hard to catch — private key / OpSec failures are outside smart contract audit scope

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

Verify all logic paths related to Rugpull 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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Sources & References

01
Source 1 https://www.bbc.com/news/technology-58437753

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause NFT
Year 2021

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