How much was lost in the Vice.Uno hack?

The Vice.Uno hack resulted in $111K in losses on October 27, 2020.

What attack technique was used in the Vice.Uno exploit?

The Vice.Uno 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.

Vice.Uno Hack

TOTAL LOST $111K

Low Oct 27, 2020 Rugpull binance

Affected Chain binance Incident surface

Recovered - No recovery reported

All-Time Rank #1491 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

The contract deployer added initial liquidity at:

https://www.bscscan.com/tx/0x8cf96acd…664327

The contract deployer used withdrawFromContract() function to transfer tokens from the staking smart contract onto his own address:

https://www.bscscan.com/tx/0x514b2d1a…aaadee

https://www.bscscan.com/tx/0x5287dc65…bfa95b

https://www.bscscan.com/tx/0x51f5e087…ba7193

https://www.bscscan.com/tx/0x61f06484…3b9ed9

https://www.bscscan.com/tx/0xe879e0dd…aab079

https://www.bscscan.com/tx/0x7d1e308f…18a424

https://www.bscscan.com/tx/0x3b8c1983…241fd1

The liquidity was removed by the contract deployer at:

https://www.bscscan.com/tx/0x522b8076…fb91d9

The project's native tokens were sold multiple times as well, the example transaction:

https://www.bscscan.com/tx/0x6fce03df…e93cd1

The stolen BNB tokens were exchanged on Binance BTC tokens at:

https://www.bscscan.com/tx/0x2b181120…de653a

The BTCB tokens were distributed between different external addresses and deposited into the Binance exchange, the example:

https://www.bscscan.com/address/0x734dfb21…f25967#tokentxns

Incident Report

Protocol / Project Vice.Uno

Date of Incident October 27, 2020

Affected Chain(s) binance

Attack Technique Rugpull

Classification Token

Primary Source View Post-Mortem

Protocol Information

Protocol Type Exit Scam/Rugpull

Affected Token VICE

Official Website vice.uno/

Protocol Twitter/X @Vice_Uno

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 binance smart contracts and deploy a custom exploit contract

Protocol Analysis Identification of the exploitable vulnerability in Vice.Uno'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

If you're auditing a protocol with similar architecture to Vice.Uno, these are the critical security checks that could have prevented this incident (October 2020).

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.

Free Trial

Sources & References

01
Source 1 https://vice.uno/

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Token
Year 2020

Learn to Prevent the Next Vice.Uno

The Vice.Uno hack is one of many attacks that skilled auditors are trained to detect before deployment. Master real exploit patterns and defense techniques with hands-on Web3 security training.

Start Free Trial Browse Attack Library