How much was lost in the DefiLabs hack?

The DefiLabs hack resulted in $1.6M in losses on July 27, 2023.

What attack technique was used in the DefiLabs exploit?

The DefiLabs 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.

DefiLabs Hack

TOTAL LOST $1.6M

Medium Jul 27, 2023 Rugpull

Affected Chain 2023 Incident surface

Recovered - No recovery reported

All-Time Rank #716 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

Quick Summary

DefiLabs Farm was rugpulled via a deployer-related address, draining multiple assets worth 1,634,351 $USD.

Details of the Exploit

DefiLabs Farm, a staking platform on the Binance Smart Chain, experienced an exitscam. The deployer of the vPoolv6 contract set a new privileged address 'funder'. This address then withdrew funds from the contract using the 'withdrawFunds' function and transferred them to another EOA.

The exploited assets included USDT, BTC, ETH, and CAKE tokens, with a total loss estimated at 1,634,351 $USD.

Block Data Reference

Deployer Address:

https://bscscan.com/address/0xfd2f26dc…b34115

Scammer's Address:

https://bscscan.com/address/0xee08d6c3…cf0be2

Funds Holder Address:

https://bscscan.com/address/0xfd2f26dc…b34115

Setting Privileged Address Transaction:

https://bscscan.com/tx/0x0f029cc8…9b57c4

Draining Transaction:

https://bscscan.com/tx/0xcd255e0d…c01e99

Incident Report

Protocol / Project DefiLabs

Date of Incident July 27, 2023

Attack Technique Rugpull

Classification Token

Primary Source View Post-Mortem

Protocol Information

Protocol Type Exit Scam/Rugpull

Official Website defilabs.farm/

Protocol Twitter/X @defilabs_farm

Team Anonymous

Source Code Verified On-Chain

Market Context at Time of Hack

Token Categories

DeFi Ethereum Ecosystem DEX Bitcoin Ecosystem BRC-20

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 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 DefiLabs'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 DefiLabs, these are the critical security checks that could have prevented this incident (July 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/HashDit/status/1684579783261458434

Threat Assessment

Severity Level

MEDIUM

Attack Vector Rugpull
Root Cause Token
Year 2023

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