How much was lost in the BigFinance hack?

The BigFinance hack resulted in $185K in losses on April 06, 2023.

What attack technique was used in the BigFinance exploit?

The BigFinance 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.

BigFinance Hack

TOTAL LOST $185K

Low Apr 06, 2023 Rugpull

Affected Chain 2023 Incident surface

Recovered - No recovery reported

All-Time Rank #1330 By amount stolen

Auditors 1 Prior security audit

Incident Overview

Quick Summary

BigFinance project rugpulled by the deployer, who removed 185,200 $USD worth of liquidity.

Details of the Exploit

BigFinance is a BEP20 token trading on PancakeSwap. The project experienced a significant liquidity removal in which its deployer removed LP funds worth 185,200 $USD. Investigation revealed that the contract was rigged to allow such malicious action from the start.

Block Data Reference

Scammer Address:

https://bscscan.com/address/0x602546d4…9c6ddb

Liquidity removal transactions:

https://bscscan.com/tx/0xbf4c8c03…89c7d6

https://bscscan.com/tx/0xa99ab9ac…513a2d

Incident Report

Protocol / Project BigFinance

Date of Incident April 06, 2023

Attack Technique Rugpull

Classification Token

Primary Source View Post-Mortem

Protocol Information

Protocol Type Yield

Affected Token BIGFI

Official Website www.bigfinance.tech

Protocol Twitter/X @bigfinancetech

Team Anonymous

Source Code Verified On-Chain

Market Context at Time of Hack

Token Categories

Memes BNB Chain Ecosystem

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 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 BigFinance'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

Audited by Audit Report 1 — still lost $185K. Prior audits don't guarantee safety, especially after post-audit code changes.

If you're auditing a protocol with similar architecture to BigFinance, these are the critical security checks that could have prevented this incident (April 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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Security Audit History

Audit Report 1 Report

Sources & References

01
Source 1 https://twitter.com/CertiKAlert/status/1644035611085402116?s=20

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Token
Year 2023

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