GrimAgent

MITRE ATT&CK: S0632 View on attack.mitre.org

Aliases: GrimAgent

First seen
2020-01-01 00:00:00
Malware type
backdoor
Family
Malware family
Operating systems
windows
Profile updated
2026-07-07 14:48:24

Targeted industries: financial-services retail-and-hospitality

Targeted regions: country_code:us country_code:gb

Context

GrimAgent is a backdoor that has been used before the deployment of Ryuk ransomware since at least 2020; it is likely used by FIN6 and Wizard Spider.

Detection coverage

  • 1 YARA rules
  • 429 Sigma rules

Malware & tools used

  • Registry Run Keys / Startup Folder (attack-pattern)
  • Windows Command Shell (attack-pattern)
  • Scheduled Task (attack-pattern)
  • Data from Local System (attack-pattern)
  • System Owner/User Discovery (attack-pattern)
  • Asymmetric Cryptography (attack-pattern)
  • File and Directory Discovery (attack-pattern)
  • Ingress Tool Transfer (attack-pattern)
  • System Network Configuration Discovery (attack-pattern)
  • Standard Encoding (attack-pattern)
  • Symmetric Cryptography (attack-pattern)
  • Native API (attack-pattern)
  • Mutual Exclusion (attack-pattern)
  • System Language Discovery (attack-pattern)
  • Time Based Checks (attack-pattern)
  • System Location Discovery (attack-pattern)
  • Clear Persistence (attack-pattern)
  • Deobfuscate/Decode Files or Information (attack-pattern)
  • Junk Data (attack-pattern)
  • File Deletion (attack-pattern)
  • Obfuscated Files or Information (attack-pattern)
  • Web Protocols (attack-pattern)
  • System Information Discovery (attack-pattern)
  • Exfiltration Over C2 Channel (attack-pattern)
  • Binary Padding (attack-pattern)

Used by threat actors

Detection rules

  • MALPEDIA_Win_Grimagent_Auto (yara-rule)

Reports & references

  • Mandiant — Fin12 Ransomware Intrusion Actor Pursuing Healthcare Targets (report)
  • malpedia.caad.fkie.fraunhofer.de — Win.Grimagent (report)
  • twitter.com — 1352359414746009608 (report)
  • blog.group-ib.com — Grimagent (report)
  • gibnc.group-ib.com — Group Ib Grimagent Analysis (report)
  • MITRE ATT&CK — S0632 (report)
  • group-ib.com — Grimagent (report)

External references