# @deeberiroz: critical backdoor in thousands of smart contracts

Source: https://xcancel.com/deeberiroz/status/1943041785476894996
Kiwi News: https://news.kiwistand.com/stories/deeberiroz-critical-backdoor-in-thousands-of-smart-contracts?index=0x687268a6e092fdc5e139da6dc51e1f4ba5668efd6e3d38b994a076ad8335e9abb9bfe37d
Submitted by misha on 2025-07-12 UTC, 9 upvotes, 0 comments

## Summary

VennBuild reports that it discovered a critical backdoor affecting thousands of smart contracts, leaving over $10,000,000 at risk for months. With help from security researchers dedaub and pcaversaccio and the seal_911 team, the group says it rescued the majority of the funds before the attacker could act. The post is a thread that describes how the attacker, whom the author suggests may be Lazarus, placed backdoors in thousands of contracts.

## Article

We @VennBuild  just discovered a critical backdoor on thousands of smart contracts leaving over $10,000,000 at risk for months

Along with the help of security researchers @dedaub @pcaversaccio, the seals team @seal_911 and others, we managed to rescue the majority of funds before the attacker could make their move.

This is the story of how a sophisticated attacker (cough Lazarus) put backdoors in thousands of contracts and ALMOST got away with it 🧵