YAHOYAH
MITRE ATT&CK: S0388 View on attack.mitre.org
Aliases: KeyBoy, YAHOYAH
- First seen
- 2011-01-01 00:00:00
- Malware type
- trojan, backdoor
- Family
- Malware family
- Operating systems
- windows
- Last IoC activity
- 2026-07-21 00:36:08
- Profile updated
- 2026-07-07 12:42:02
Targeted industries: government-and-public-sector healthcare-and-pharmaceutical technology-and-telecommunications
Targeted regions: country_code:tw country_code:hk country_code:ph
Context
YAHOYAH is a Trojan used by Tropic Trooper as a second-stage backdoor.
Detection coverage
- 1 YARA rules
- 153 Sigma rules
Malware & tools used
- Ingress Tool Transfer (attack-pattern)
- Security Software Discovery (attack-pattern)
- Deobfuscate/Decode Files or Information (attack-pattern)
- Web Protocols (attack-pattern)
- Encrypted/Encoded File (attack-pattern)
- System Information Discovery (attack-pattern)
Used by threat actors
- Tropic Trooper (threat-actor)
Detection rules
- MALPEDIA_Win_Yahoyah_Auto (yara-rule)
Reports & references
- researchcenter.paloaltonetworks.com — Unit42 Tropic Trooper Targets Taiwanese Government And Fossil Fuel Provider With Poison Ivy (report)
- malpedia.caad.fkie.fraunhofer.de — Win.Yahoyah (report)
- MITRE ATT&CK — S0388 (report)
- Trend Micro — Wp Operation Tropic Trooper (report)