How much was lost in the fren hack?

The fren hack resulted in $34K in losses on July 10, 2023.

What attack technique was used in the fren exploit?

The fren 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.

fren Hack

TOTAL LOST $34K

Low Jul 10, 2023 Rugpull

Affected Chain 2023 Incident surface

Recovered - No recovery reported

All-Time Rank #1808 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

Quick Summary

FREN token was rugpulled by deployer, removing liquidity worth 33,768 USD from UniSwap pool in an exit scam.

Details of the Exploit

FREN is an ERC20 token trading on UniSwap. On Jul 10, 2023, the deployer of the FREN token removed liquidity from the UniSwap pool in a single transaction, executing a rugpull exit scam. The deployer removed 18.01 WETH, which is equivalent to approximately 33,768 USD, causing a significant loss for the token holders.

Block Data Reference

Deployer Address:

https://etherscan.io/address/0x2A6d72d2…8D8Ac1

07e7af59cc2420545224f08762e9935b3c4

Liquidity Removal Transaction:

https://etherscan.io/tx/0x7a043300…24cc05

Incident Report

Protocol / Project fren

Date of Incident July 10, 2023

Attack Technique Rugpull

Classification Token

Protocol Information

Protocol Type Exit Scam/Rugpull

Affected Token FREN

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 fren'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 fren, 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.

Free Trial

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Token
Year 2023

Learn to Prevent the Next fren

The fren hack is one of many attacks that skilled auditors are trained to detect before deployment. Master real exploit patterns and defense techniques with hands-on Web3 security training.

Start Free Trial Browse Attack Library