How much was lost in the SageSwap Token hack?

The SageSwap Token hack resulted in — in losses on August 25, 2021.

What attack technique was used in the SageSwap Token exploit?

The SageSwap Token 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.

SageSwap Token Hack

TOTAL LOST —

Aug 25, 2021 Rugpull binance

Affected Chain binance Incident surface

Recovered - No recovery reported

Same Technique 865 Total incidents

Protocol Type Yield Target category

Incident Overview

OSWAP token is designed to reflect the success of Oswap protocol — with greater total value locked (TVL) in all pools of Oswap DEX the token appreciates faster, and with lower TVL it appreciates slower.

Incident Report

Protocol / Project SageSwap Token

Date of Incident August 25, 2021

Affected Chain(s) binance

Attack Technique Rugpull

Classification Exchange (DEX)

Primary Source View Post-Mortem

Protocol Information

Protocol Type Yield

Affected Token MEOW

Official Website meowswap.finance/

Protocol Twitter/X @ObyteOrg

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 SageSwap Token's contract logic - root cause: exchange (dex)

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 SageSwap Token, these are the critical security checks that could have prevented this incident (August 2021).

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://bscscan.com/token/0x9e0bc04dad42429523fd375b9a0a2384d1738fa0
02
Reference https://bscscan.com/address/0x36eea950eb74ca6639f64fb4b16f0adb68…
03
Reference https://bscscan.com/address/0x9ce5ffa03E263505547042D2feBc11531E…

Threat Assessment

Severity Level

UNKNOWN

Attack Vector Rugpull
Root Cause Exchange (DEX)
Year 2021

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