How much was lost in the Jointventure Finance hack?

The Jointventure Finance hack resulted in $4K in losses on January 13, 2021.

What attack technique was used in the Jointventure Finance exploit?

The Jointventure Finance 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.

Jointventure Finance Hack

TOTAL LOST $4K

Low Jan 13, 2021 Rugpull ethereum

Affected Chain ethereum Incident surface

Recovered - No recovery reported

All-Time Rank #1982 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

The contract deployer has locked part of tokens at:

https://etherscan.io/tx/0x6077ef8c…3c4dbc

The contract deployer added initial liquidity at:

https://etherscan.io/tx/0xde4ad6af…f4ed7e

The contract deployer used hidden minting functionality under the burnFrom() function to generate new tokens onto his wallet at:

https://etherscan.io/tx/0xa9d1f673…f4415e

The minted tokens were sold by the contract deployer at:

https://etherscan.io/tx/0x05e5b1fd…22439b

Incident Report

Protocol / Project Jointventure Finance

Date of Incident January 13, 2021

Affected Chain(s) ethereum

Attack Technique Rugpull

Classification Token

Protocol Information

Protocol Type Exit Scam/Rugpull

Affected Token JVF

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 Jointventure Finance'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 Jointventure Finance, 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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Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Token
Year 2021

Learn to Prevent the Next Jointventure Finance

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