Lazarus Group targets Aerospace and Defense with new Comebacker variant

2025-11-07 ENKI

https://www.enki.co.kr/en/media-center/blog/lazarus-group-targets-aerospace-and-defense-with-new-comebacker-variant

Thumbnail for Lazarus Group targets Aerospace and Defense with new Comebacker variant

ENKI identified a Lazarus-attributed Comebacker variant delivered through malicious Word documents staged on office-theme[.]com and themed around aerospace and defense organizations. When macros run, the dropper decrypts a loader and decoy document, writes wpsoffice_aam.ocx and USOPrivate.dll, creates Startup-folder persistence, and executes the final Comebacker payload in memory. Comebacker beacons over HTTPS to hiremployee[.]com with AES-encrypted and Base64-encoded traffic, then can download encrypted follow-on payloads after MD5 validation and ChaCha20 decryption. Infrastructure pivoting found birancearea[.]com and a related March 2025 Comebacker sample, indicating the campaign may have been active before the observed June 2025 documents.

Indicators of Compromise

Type Value First Seen Last Seen
HASH 7e61c884ce5207839e0df7a22f08f0a… 2025-11-07 2025-11-07
HASH f2b3867aa06fb38d1505b3c2b9e523d… 2025-11-07 2025-11-07
HASH 96b973e577458e5b912715171070c0a… 2025-11-07 2025-11-07
HASH b7d625679fbcc86510119920ffdd6d2… 2025-11-07 2025-11-07
HASH 14213c013d79ea4bc8309f730e26d52… 2025-11-07 2025-11-07
HASH b357b3882cf8107b1cb59015c4be3e0… 2025-11-07 2025-11-07
HASH c4a5179a42d9ff2774f7f1f937086c8… 2025-11-07 2025-11-07
HASH ad9c5aca9977d04c73be579199a8270… 2025-11-07 2025-11-07
HASH 046caa2db6cd14509741890e971ddc8… 2025-11-07 2025-11-07
URL https://birancearea.com/adminv2 2025-11-07 2025-11-07
URL https://hiremployee.com 2025-11-07 2025-11-07
DOMAIN hiremployee.com 2025-11-07 2025-11-07
DOMAIN birancearea.com 2025-11-07 2025-11-07
DOMAIN office-theme.com 2025-11-07 2025-11-07
HASH a75886b016d84c3eaacaf01a3c61e04… 2021-01-25 2025-11-07

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