How much was lost in the LayerZero hack?

The LayerZero hack resulted in $1.0M in losses on August 20, 2023.

What attack technique was used in the LayerZero exploit?

The LayerZero 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.

LayerZero Hack

TOTAL LOST $1.0M

Medium Aug 20, 2023 Rugpull

Affected Chain 2023 Incident surface

Recovered - No recovery reported

All-Time Rank #826 By amount stolen

Protocol Type Bridge Target category

Incident Overview

Quick Summary

LayerZero, a fake BEP20 token, was rugpulled on Aug 20, 2023, causing a loss of 1,045,094 $USD

Details of the Exploit

LayerZero (ZRO) is a copycat BEP20 token trading on PancakeSwap. On Aug 20, 2023, the deployer removed liquidity from the LP pool. The token was advertised on a Russian-speaking Telegram group named KryptoAtom.

The stolen funds, amounting to 1,045,094 $USD worth 4,827.99 $BNB, were transferred through several EOA addresses and then swapped for $USDT. As of August 21, 2023, the funds remain at the scammer's EOA.

Block Data Reference

- Deployer Address:

https://bscscan.com/address/0x7Ee2fc5e…955aBE

- Scammer Address:

https://bscscan.com/address/0x2ebc576b…b72d5e

- Funds Holder as of August 21, 2023:

https://bscscan.com/address/0xa792a4ad…ad4d84

- Liquidity Removal Transaction:

https://bscscan.com/tx/0x098ed453…2aed67

- Swapping Transactions:

https://bscscan.com/tx/0xefa6247b…1b7352

https://bscscan.com/tx/0x1b63f44b…cf10d2

https://bscscan.com/tx/0x3f49c124…3948ff

Incident Report

Protocol / Project LayerZero

Date of Incident August 20, 2023

Attack Technique Rugpull

Classification Token

Primary Source View Post-Mortem

Protocol Information

Protocol Type Bridge

Affected Token ZRO

Official Website layerzero.network/

Protocol Twitter/X @LayerZero_Labs

Team Anonymous

Source Code Verified On-Chain

Market Context at Time of Hack

Token Categories

DeFi Interoperability Ethereum Ecosystem Coinbase Ventures Portfolio YZi Labs Portfolio Avalanche Ecosystem a16z Portfolio Multicoin Capital Portfolio

Protocol Links

GitHub Discord

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 LayerZero'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 LayerZero, 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/1693362027371123099?s=20

Threat Assessment

Severity Level

MEDIUM

Attack Vector Rugpull
Root Cause Token
Year 2023

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