Umbrella Network Hack

TOTAL LOST $700K
Low Other

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain 2022 Incident surface
Recovered - No recovery reported
All-Time Rank #920 By amount stolen
Auditors 4 Prior security audits

Incident Overview

The hacker attacked Umbrella Network's reward pools, causing $700,000 to be siphoned from both BNB Chain and Ethereum.

On March 20, 2022, Umbrella Network revealed that the LP tokens staked in their Polar Stream staking contracts on Ethereum and BNB Chain had been drained from both contracts. According to reports, the hacker then used the stolen LP tokens to withdraw liquidity from both the UMB-ETH Uniswap and the UMB-BNB Pancakeswap pools.

The hack is possible because of an unchecked underflow in withdraw() so that anyone can withdraw any amount even without any balance.

Incident Report

Protocol / Project Umbrella Network
Date of Incident
Attack Technique Other
Classification Other
Primary Source View Post-Mortem #1 View Post-Mortem #2 View Post-Mortem #3

Protocol Information

Protocol Type Oracle
Affected Token UMB
Official Website umb.network/
Protocol Twitter/X @UmbNetwork
Team Anonymous
Source Code Unverified

Market Context at Time of Hack

Token Categories
DeFi Oracles Ethereum Ecosystem Polkastarter Polygon Ecosystem Bounce Launchpad BNB Chain Ecosystem MultiversX 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 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 Umbrella Network's contract logic - root cause: other
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, Audit Report 2, Audit Report 3, Audit Report 4 — still lost $700K. Prior audits don't guarantee safety, especially after post-audit code changes.

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

  • 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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Security Audit History

Sources & References

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