Famous Chollima Evolves Its Arsenal, Merging BeaverTail and OtterCookie

2025-10-24 Poly Swarm

https://blog.polyswarm.io/famous-chollima-evolves-its-arsenal-merging-beavertail-and-ottercookie

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Famous Chollima is described as merging BeaverTail and OtterCookie capabilities in Contagious Interview operations that lure job seekers into installing trojanized software. In the Sri Lanka incident, a user cloned a Bitbucket repository for a Web3 chess platform, and its dependencies pulled the malicious node-nvm-ssh NPM package, whose post-install scripts executed obfuscated JavaScript. BeaverTail enumerated browser profiles and cryptocurrency wallet extensions such as MetaMask, Phantom, and Solflare, while also downloading Python-based InvisibleFerret modules from C2 servers. OtterCookie added modular remote shell, file-upload, crypto-extension theft, clipboard monitoring, keylogging, and screenshot functions, with later versions adding anti-analysis checks and more dynamic code loading. The overlap shows DPRK-linked fake-recruitment tradecraft evolving from social engineering into supply-chain delivery and more complete credential and cryptocurrency theft tooling.

Indicators of Compromise

Type Value First Seen Last Seen
HASH caad2f3d85e467629aa535e0081865d… 2025-10-16 2025-10-24
HASH 83c145aedfdf61feb02292a6eb5091e… 2025-10-16 2025-10-24

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