How much was lost in the Flashmall hack?

The Flashmall hack resulted in $508K in losses on July 19, 2023.

What attack technique was used in the Flashmall exploit?

The Flashmall 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.

Flashmall Hack

TOTAL LOST $508K

Low Jul 19, 2023 Rugpull

Affected Chain 2023 Incident surface

Recovered - No recovery reported

All-Time Rank #998 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

Quick Summary

Flashmall project was rugpulled with stolen funds worth 508,350 $USD bridged to Ethereum via Celer Bridge.

Details of the Exploit

Flashmall is a project on the Binance Smart Chain. A privileged address set by the project manipulated a function to mint 10 times the tokens every time and then swap back tokens 1:1, finally removing liquidity to profit around 508,350 $USD. Part of these stolen funds was bridged to Ethereum via Celer Bridge and consequently transferred through TornadoCash as 200 BNB and 250 ETH.

Block Data Reference

Scammer Address:

https://bscscan.com/address/0x613C6F06…23193A

TornadoCash Transfers on BSC:

https://bscscan.com/tx/0x6ade5d00…ac88da

https://bscscan.com/tx/0xda59ad2c…a082bd

Incident Report

Protocol / Project Flashmall

Date of Incident July 19, 2023

Attack Technique Rugpull

Classification Token

Primary Source View Post-Mortem

Protocol Information

Protocol Type Exit Scam/Rugpull

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 Flashmall'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 Flashmall, 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/BeosinAlert/status/1681850857502003201

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Token
Year 2023

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