How much was lost in the Dollar hack?

The Dollar hack resulted in $383K in losses on September 26, 2022.

What attack technique was used in the Dollar exploit?

The Dollar 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.

Dollar Hack

TOTAL LOST $383K

Low Sep 26, 2022 Rugpull

Affected Chain 2022 Incident surface

Recovered - No recovery reported

All-Time Rank #1079 By amount stolen

Auditors 1 Prior security audit

Incident Overview

Quick Summary

Dollar token was rug pulled. The token deployer removed liquidity and took away 382,660 $USD.

Details of the Exploit

Dollar is a BEP20 token, and can't be confused with other tokens with the same name. The token deployer removed liquidity for the total amount of 382,660 $BUSD.

Block Data Reference

Scammer address:

https://bscscan.com/address/0x9b5c7217…dee4a1

Removal transaction:

https://bscscan.com/tx/0x4f81f454…c9fb43

Incident Report

Protocol / Project Dollar

Date of Incident September 26, 2022

Attack Technique Rugpull

Classification Token

Primary Source View Post-Mortem

Protocol Information

Protocol Type CDP

Affected Token Dollar

Official Website dollaronsolana.lol/

Protocol Twitter/X @xDollarFi

Team Anonymous

Source Code Verified On-Chain

Market Context at Time of Hack

Token Categories

Ethereum Ecosystem Avalanche Ecosystem Solana Ecosystem Polygon Ecosystem Arbitrum Ecosystem BNB Chain Ecosystem Sui Ecosystem Optimism Ecosystem

Protocol Links

GitHub

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 Dollar'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

Audited by Audit Report 1 — still lost $383K. Prior audits don't guarantee safety, especially after post-audit code changes.

If you're auditing a protocol with similar architecture to Dollar, these are the critical security checks that could have prevented this incident (September 2022).

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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Security Audit History

Audit Report 1 Report

Sources & References

01
Source 1 https://twitter.com/CertiKAlert/status/1574376973228511234

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Token
Year 2022

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