Incident Overview
DEUS Finance was exploited through flash loan and oracle manipulation, resulting in a significant loss.
The attacker initiated the exploit by flash loaning 143.2m USDC, which was then swapped to 9.5m DEI via sAMM-USDC/DEI_USDC-DEI, causing an increase in DEI price. 71k DEI was used as collateral to borrow 17.2k DEI from DeiLenderSolidex, and the flash loan was repaid. The attacker was initially funded via Multichain, with the origin of funds coming from an Ethereum address.
After the attack, the profit was deposited back to the same Ethereum address.
The attacker's address:
https://ftmscan.com/address/0x70142852…2a37cb
The transaction behind the attack:
https://ftmscan.com/tx/0x39825ff8…c9c9b5
The Ethereum address where the funds originated and were returned:
https://etherscan.io/address/0x70142852…2a37cb
The Tornado Cash mixer where the stolen funds were deposited:
https://bloxy.info/txs/transfers_from/0x70142852…2a37cb?currency_id=1
Incident Report
Protocol Information
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.
What Auditors Should Check
If you're auditing a protocol with similar architecture to DEUS Finance, these are the critical security checks that could have prevented this incident (April 2022).
- Verify all logic paths related to Flashloan Price Oracle Attack / Flash Loan Attack are guarded by proper access controls and input validation - see the Flash Loans Attacks attack class for patterns
- Audit oracle price feeds for manipulation risks - ensure time-weighted average prices (TWAPs) or multi-source aggregators are used, not spot prices
- 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.
Free TrialRelated Attack Classes
The technique used in this hack maps to these vulnerability classes in our security curriculum:
Proof-of-Concept Exploits
On-Chain Evidence & References
Sources & References
Learn to Prevent the Next DEUS Finance
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