How much was lost in the Yzer Token hack?

The Yzer Token hack resulted in $29K in losses on September 21, 2023.

What attack technique was used in the Yzer Token exploit?

The Yzer Token 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.

Yzer Token Hack

TOTAL LOST $29K

Low Sep 21, 2023 Rugpull

Affected Chain 2023 Incident surface

Recovered - No recovery reported

All-Time Rank #1838 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

Quick Summary

Yzer Token rugpull occurred on Sep 21, 2023, with the deployer removing liquidity worth 28,960 USD (17.38 ETH) in an exit scam.

Details of the Exploit

Yzer Token, an ERC20 token trading on UniSwap, experienced a rugpull on Sep 21, 2023. The deployer removed liquidity from the LP pool, resulting in a loss of 28,960 USD, equivalent to 17.38 ETH. The stolen funds were transferred to another EOA address, where they are still as of Oct 3, 2023.

Block Data Reference

Deployer Address:

https://etherscan.io/address/0x050c731a…c379BD

Scammer Address:

https://etherscan.io/address/0xdeD9CF64…CFb05C

Liquidity Removal Transaction:

https://etherscan.io/tx/0x5fc6a2fc…4994b3

Incident Report

Protocol / Project Yzer Token

Date of Incident September 21, 2023

Attack Technique Rugpull

Classification Token

Primary Source View Post-Mortem

Protocol Information

Protocol Type Exit Scam/Rugpull

Affected Token YZER

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 Yzer Token'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 Yzer Token, these are the critical security checks that could have prevented this incident (September 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/SlowMist_Team/status/1705966356171002001

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Token
Year 2023

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