How much was lost in the Remitano hack?

The Remitano hack resulted in $2.7M in losses on September 15, 2023.

What attack technique was used in the Remitano exploit?

The Remitano exploit utilized Private Key Compromised (Unknown Method). 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.

Remitano Hack

TOTAL LOST $2.7M

Medium Sep 15, 2023 Private Key Compromised (Unknown Method) bitcoincash ethereum tron

Affected Chain bitcoincash 3 chains affected

Recovered - No recovery reported

All-Time Rank #565 By amount stolen

Year 2023 Incident year

Incident Report

Protocol / Project Remitano

Date of Incident September 15, 2023

Affected Chain(s) bitcoincash ethereum tron

Attack Technique Private Key Compromised (Unknown Method)

Classification Infrastructure

Primary Source View Post-Mortem

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 Operational-security tradecraft (phishing, malware, leaked seed phrases, or insider access) to obtain treasury signing authority

Capital Required Minimal capital - only enough to cover gas while draining the compromised accounts

On-Chain Access Valid signing authority over the compromised wallets / multisig signers, allowing direct transfer of funds or stake authorization

Target Reconnaissance Identification of Remitano's high-value treasury accounts and the authority / multisig structure controlling them

Execution Speed Speed to drain the compromised accounts before the team detects the breach and revokes signing authority or freezes the assets

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 Remitano, these are the critical security checks that could have prevented this incident (September 2023).

Verify all logic paths related to Private Key Compromised (Unknown Method) are guarded by proper access controls and input validation - see the Access Control Attacks attack class for patterns
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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Related Attack Classes

The technique used in this hack maps to these vulnerability classes in our security curriculum:

See all Access Control Attacks examples →

Access Control Attacks

Sources & References

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Source 1 https://twitter.com/CyversAlerts/status/1702348063145165016/photo/1

Threat Assessment

Severity Level

MEDIUM

Attack Vector Private Key Compromised (Unknown Method)
Root Cause Infrastructure
Year 2023

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