How much was lost in the Holy Trinity hack?

The Holy Trinity hack resulted in $34K in losses on January 18, 2021.

What attack technique was used in the Holy Trinity exploit?

The Holy Trinity 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.

Holy Trinity Hack

TOTAL LOST $34K

Low Jan 18, 2021 Rugpull ethereum

Affected Chain ethereum Incident surface

Recovered - No recovery reported

All-Time Rank #1801 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

The project was holding a presale event using a separate smart contract.The gathered funds were transferred to the contract deployer's address:

https://etherscan.io/tx/0x7ca1d808…86d9cf

The contract deployer added initial liquidity using funds from the presale at:

https://etherscan.io/tx/0xafffdf48…6c28a8

The liquidity was removed by the contract deployer at:

https://etherscan.io/tx/0x9678b04e…0d1e5b

https://etherscan.io/tx/0x68030177…ad4bcc

Incident Report

Protocol / Project Holy Trinity

Date of Incident January 18, 2021

Affected Chain(s) ethereum

Attack Technique Rugpull

Classification Other

Primary Source View Post-Mortem

Protocol Information

Protocol Type Exit Scam/Rugpull

Affected Token HOLY

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 ethereum smart contracts and deploy a custom exploit contract

Protocol Analysis Identification of the exploitable vulnerability in Holy Trinity's contract logic - root cause: other

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 Holy Trinity, these are the critical security checks that could have prevented this incident (January 2021).

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/DetectivesRug/status/1342115507940585472

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Other
Year 2021

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