How much was lost in the Sloth Inu hack?

The Sloth Inu hack resulted in $8K in losses on November 25, 2021.

What attack technique was used in the Sloth Inu exploit?

The Sloth Inu 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.

Sloth Inu Hack

TOTAL LOST $8K

Low Nov 25, 2021 Rugpull

Affected Chain 2021 Incident surface

Recovered - No recovery reported

All-Time Rank #1954 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

The contract deployer added initial liquidity at:

https://etherscan.io/tx/0xe34fe755…5089af

The liquidity was removed by the contract deployer at:

https://etherscan.io/tx/0xd5174a5b…aa082d

https://etherscan.io/tx/0x092c83c7…bc9043

Incident Report

Protocol / Project Sloth Inu

Date of Incident November 25, 2021

Attack Technique Rugpull

Classification Token

Primary Source View Post-Mortem

Protocol Information

Protocol Type Exit Scam/Rugpull

Affected Token SLOTH INU

Official Website slothinu.com/

Protocol Twitter/X @slothinu

Team Anonymous

Source Code Unverified

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 Sloth Inu'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 Sloth Inu, these are the critical security checks that could have prevented this incident (November 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://slothinu.com/
02
Web Archive http://web.archive.org/web/20211122065336/https://slothinu.com/

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Token
Year 2021

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