How much was lost in the Builders NFT hack?

The Builders NFT hack resulted in $89K in losses on November 14, 2023.

What attack technique was used in the Builders NFT exploit?

The Builders NFT 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.

Builders NFT Hack

TOTAL LOST $89K

Low Nov 14, 2023 Rugpull

Affected Chain 2023 Incident surface

Recovered - No recovery reported

All-Time Rank #1568 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

Quick Summary

BuiLDerS token rugpulled on PancakeSwap, with 89,296 USD worth of liquidity removed by the scammer.

Details of the Exploit

BuiLDerS, a BEP20 token trading on PancakeSwap, experienced a rugpull on November 14, 2023. The scammer swapped a significantly larger number of tokens, completely depleting the liquidity pool. The stolen funds, amounting to 89,296 USD (369.19 WBNB), were transferred to another EOA and then distributed between multiple addresses.

Block Data Reference

Deployer Address:

https://bscscan.com/address/0x02604E54…bC0A2C

Scammer's Addresses:

https://bscscan.com/address/0xF751d509…f70090

https://bscscan.com/address/0x0aE08b47…eb915f

Liquidity Removal Transaction:

https://bscscan.com/tx/0xb622506e…027faa

Incident Report

Protocol / Project Builders NFT

Date of Incident November 14, 2023

Attack Technique Rugpull

Classification Token

Primary Source View Post-Mortem

Protocol Information

Protocol Type Exit Scam/Rugpull

Affected Token BuiLDerS

Team Anonymous

Source Code Verified On-Chain

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 Builders NFT's contract logic - root cause: token

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

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://twitter.com/PeckShieldAlert/status/1724312180714099079

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Token
Year 2023

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