BeaverTail and OtterCookie evolve with a new Javascript module

2025-10-16 Cisco Talos

https://blog.talosintelligence.com/beavertail-and-ottercookie/

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Cisco Talos linked a new intrusion to Famous Chollima, a DPRK-aligned subgroup of Lazarus that uses fake hiring activity to compromise job seekers and steal credentials and cryptocurrency. A system in a Sri Lanka-headquartered organization was likely infected after a user installed a trojanized Node.js application called Chessfi, distributed through the npm package node-nvm-ssh. Talos found BeaverTail and OtterCookie functionality merging in recent tooling, including a previously undocumented OtterCookie module for keylogging, desktop screenshots, and in one sample clipboard theft. The malware used socket.io-based C2, remote shell capability, file upload modules, cryptocurrency wallet and browser-extension theft, and observed infrastructure including 172.86.88.188 and 138.201.50.5. Talos also found a malicious VS Code extension containing BeaverTail and OtterCookie code, though it did not attribute that extension to Famous Chollima with high confidence.

Indicators of Compromise

Type Value First Seen Last Seen
IPv4 23.227.202.244 2025-10-10 2026-01-21
HASH caad2f3d85e467629aa535e0081865d… 2025-10-16 2025-10-24
HASH 83c145aedfdf61feb02292a6eb5091e… 2025-10-16 2025-10-24
HASH 9e65de386b40f185bf7c1d9b1380395… 2025-10-16 2025-10-16
HASH d89c45d65a825971d250d12bc7a4493… 2025-10-16 2025-10-16
HASH dff2a0fb344a0ad4b2c129712b2273f… 2025-10-16 2025-10-16
HASH 77aec48003beeceb88e70bed138f535… 2025-10-16 2025-10-16
HASH 6a9b4e8537bb97e337627b4dd1390bd… 2025-10-16 2025-10-16
HASH a6914ded72bdd21e2f76acde46bf92b… 2025-10-16 2025-10-16
HASH c841b6c4ac4d2e83f16cf7a8bfbec3d7 2025-10-16 2025-10-16
HASH 51ddd8f6ff30d76de45e06902c45c55… 2025-10-16 2025-10-16
HASH d27c9f75c3f1665ee19642381a4dd6f… 2025-10-16 2025-10-16
HASH 8efa928aa896a5bb3715b8b0ed20881… 2025-10-16 2025-10-16
HASH 0904eff1edeff4b6eb27f03e0ccc759… 2025-10-16 2025-10-16
IPv4 172.86.113.12 2025-10-16 2025-10-16
IPv4 144.172.112.50 2025-10-16 2025-10-16
IPv4 172.86.88.188 2025-10-16 2025-10-16
IPv4 172.86.73.46 2025-10-16 2025-10-16
IPv4 138.201.50.5 2025-10-10 2025-10-16
IPv4 144.172.96.35 2025-05-30 2025-10-16
IPv4 135.181.123.177 2025-04-11 2025-10-16
HASH f08e3ee84714cc5faefb7ac300485c8… 2025-03-17 2025-10-16
HASH 72ebfe69c69d2dd173bb92013ab44d8… 2023-11-21 2025-10-16

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