Casper DeFi Hack

TOTAL LOST $172K
Low Other

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain 2021 Incident surface
Recovered $190K 100.0% returned
All-Time Rank #1350 By amount stolen
Auditors 1 Prior security audit

Incident Overview

In the official post mortem, the project team says that their Solidity developer left the minting possibility in the contract constructor.

Their Solidity developer is the contract deployer as well:

https://ftmscan.com/address/0xe6a02584…19782b

The contract deployer invoked the mint() function in the following transactions:

https://ftmscan.com/tx/0xf296baf2…05f29d

https://ftmscan.com/tx/0x4d02eac3…8d4a36

https://ftmscan.com/tx/0x86360b2e…7ea35d

The minted tokens were sold by the contract deployer multiple times:

https://ftmscan.com/txs?a=0xe6a02584…19782b&p=1

Received WFTM tokens were exchanged on BNB tokens and bridged to the BSC:

https://ftmscan.com/tx/0xf1d92544…5586f8

https://ftmscan.com/tx/0xb099c04d…b6fd80

The token recipient on the Binance Smart Chain:

https://www.bscscan.com/address/0xe6a02584…19782b

The stolen 516.91 BNB tokens were exchanged on BTCB at:

https://www.bscscan.com/tx/0xf4bc083c…41c41b

BTCB tokens were bridged through Ren:

https://www.bscscan.com/tx/0x2c22bd5f…6111c2

According to the announcement below, stolen funds were returned:

https://casperdefi.medium.com/casper-defi-post-mortem-after-casper-token-hack-part-2-1bae9a65ae5c

Incident Report

Protocol / Project Casper DeFi
Date of Incident
Attack Technique Other
Classification Yield Aggregator
Primary Source View Post-Mortem #1 View Post-Mortem #2

Protocol Information

Protocol Type Dexs
Affected Token CASPER
Official Website www.casperdefi.com/
Protocol Twitter/X @CasperTracker

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 other 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 Casper DeFi's contract logic - root cause: yield aggregator
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? Likely — with a thorough Other audit checklist and test coverage
Audited by Audit Report 1 — still lost $172K. Prior audits don't guarantee safety, especially after post-audit code changes.

If you're auditing a protocol with similar architecture to Casper DeFi, these are the critical security checks that could have prevented this incident (August 2021).

  • Verify all logic paths related to Other 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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Funds Recovery

100.0%

Recovered

$190K

Net Loss

0

Security Audit History

Sources & References

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