FishMaster
Aliases: JollyJellyfish
- First seen
- 2022-05-10 00:00:00
- Malware type
- loader
- Family
- Malware family
- Profile updated
- 2026-07-07 13:02:09
Targeted industries: government-and-public-sector financial-services technology-and-telecommunications
Context
FishMaster, also known as JollyJellyfish, is a custom loader designed for deploying CobaltStrike beacons. It has been observed targeting various sensitive sectors, leveraging stealth techniques to deliver its payload.
Detection coverage
- 1 YARA rules
Detection rules
- MALPEDIA_Win_Fishmaster_Auto (yara-rule)
Reports & references
- media-exp1.licdn.com — 1639591145314 (report)
- decoded.avast.io — Backdoored Client From Mongolian Ca Monpass (report)
- speakerdeck.com — Winnti Is Coming Evolution After Prosecution At Hitcon2021 (report)
- malpedia.caad.fkie.fraunhofer.de — Win.Fishmaster (report)