How much was lost in the EspressoBot hack?

The EspressoBot hack resulted in $53K in losses on August 31, 2023.

What attack technique was used in the EspressoBot exploit?

The EspressoBot 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.

EspressoBot Hack

TOTAL LOST $53K

Low Aug 31, 2023 Rugpull

Affected Chain 2023 Incident surface

Recovered - No recovery reported

All-Time Rank #1704 By amount stolen

Protocol Type Exit Scam/Rugpull Target category

Incident Overview

Quick Summary

EspressoBot deployer performed a rugpull, draining liquidity worth 53,110 USD from UniSwap, resulting in a total loss of 33.04 WETH.

Details of the Exploit

EspressoBot is an ERC20 token trading on UniSwap. On August 8, 2023, the deployer-related address executed an exit scam by draining the liquidity pool in 12 transactions. The stolen funds, amounting to 53,110 USD (equivalent to 33.04 WETH), were transferred through several EOA addresses.

Part of the funds currently remains in another EOA address. It was discovered that the deployer was funded on Binance.

Block Data Reference

Deployer Address:

https://etherscan.io/address/0x5737083f…a8CdcE

Scammer Address:

https://etherscan.io/address/0xee34Cc55…3C0f18

Funds Holder Address as of Sep 10, 2023:

https://etherscan.io/address/0x13ce2410…ef5579

Liquidity Drain Transactions:

https://etherscan.io/tx/0xe49905a4…4482f0

https://etherscan.io/tx/0xb20a97e2…c83659

Incident Report

Protocol / Project EspressoBot

Date of Incident August 31, 2023

Attack Technique Rugpull

Classification Token

Primary Source View Post-Mortem

Protocol Information

Protocol Type Exit Scam/Rugpull

Affected Token ESPS

Official Website espresso.foundation/

Protocol Twitter/X @EspressoBot_ETH

Team Anonymous

Source Code Verified On-Chain

Market Context at Time of Hack

Token Categories

Interoperability Scaling Ethereum Ecosystem Arbitrum Ecosystem Binance Wallet IDO Binance Ecosystem Binance Listing

Protocol Links

GitHub Discord

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 smart contracts and deploy a custom exploit contract

Protocol Analysis Identification of the exploitable vulnerability in EspressoBot'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 EspressoBot, these are the critical security checks that could have prevented this incident (August 2023).

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.

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Sources & References

01
Source 1 https://twitter.com/CyversAlerts/status/1697142817431101706?s=20

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Token
Year 2023

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