How much was lost in the CIRCLE (fake) hack?

The CIRCLE (fake) hack resulted in $216K in losses on August 11, 2023.

What attack technique was used in the CIRCLE (fake) exploit?

The CIRCLE (fake) 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.

CIRCLE (fake) Hack

TOTAL LOST $216K

Low Aug 11, 2023 Rugpull

Affected Chain 2023 Incident surface

Recovered - No recovery reported

All-Time Rank #1266 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

Quick Summary

The CIRCLE fake token recently experienced a rug pull incident, leading to a significant loss of approximately $216.3k USD.

Details of the Exploit

The project team behind the CIRCLE fake token executed a rug pull by performing token dumping at the PancakeSwap V2 pool. As a result, they successfully withdrew and transferred a total of 900 BNB, equivalent to $216k USD, distributing the ill-gotten funds across four different wallets.

This sudden liquidity removal and token transfer event caught the community off guard, causing substantial financial losses to investors and holders of CIRCLE fake token.

Block Data Reference

Scammer address:

https://bscscan.com/address/0x88fd0d93…8f0c5a

Liquidity Removal tx:

https://bscscan.com/tx/0x951665fc…b45572

https://bscscan.com/tx/0xb8d65dbf…ab29fe

https://bscscan.com/tx/0x13b759f9…7df7d8

https://bscscan.com/tx/0x34549385…b25def

https://bscscan.com/tx/0xa759acda…deddd5

https://bscscan.com/tx/0x7053a053…1ac6d1

Incident Report

Protocol / Project CIRCLE (fake)

Date of Incident August 11, 2023

Attack Technique Rugpull

Classification Token

Primary Source View Post-Mortem

Protocol Information

Protocol Type Exit Scam/Rugpull

Affected Token CIRCLE

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 CIRCLE (fake)'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 CIRCLE (fake), these are the critical security checks that could have prevented this incident (August 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/CertiKAlert/status/1691190203858276353?s=20

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Token
Year 2023

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