Okrum

MITRE ATT&CK: S0439 View on attack.mitre.org

Aliases: Okrum

First seen
2016-12-01 00:00:00
Malware type
backdoor
Family
Malware family
Operating systems
windows
Profile updated
2026-07-07 14:31:01

Targeted industries: government-and-public-sector

Targeted regions: country_code:sk country_code:pl country_code:cz

Context

Okrum is a Windows backdoor that has been seen in use since December 2016 with strong links to Ke3chang.

Detection coverage

  • 531 Sigma rules

Malware & tools used

  • Cached Domain Credentials (attack-pattern)
  • Shortcut Modification (attack-pattern)
  • Archive via Utility (attack-pattern)
  • System Checks (attack-pattern)
  • User Activity Based Checks (attack-pattern)
  • Ingress Tool Transfer (attack-pattern)
  • Windows Command Shell (attack-pattern)
  • Time Based Checks (attack-pattern)
  • Windows Service (attack-pattern)
  • System Network Configuration Discovery (attack-pattern)
  • Web Protocols (attack-pattern)
  • Data Obfuscation (attack-pattern)
  • Scheduled Task (attack-pattern)
  • Steganography (attack-pattern)
  • Masquerade Task or Service (attack-pattern)
  • System Owner/User Discovery (attack-pattern)
  • System Information Discovery (attack-pattern)
  • Exfiltration Over C2 Channel (attack-pattern)
  • Standard Encoding (attack-pattern)
  • Service Execution (attack-pattern)
  • Token Impersonation/Theft (attack-pattern)
  • File and Directory Discovery (attack-pattern)
  • Hidden Files and Directories (attack-pattern)
  • External Proxy (attack-pattern)
  • Symmetric Cryptography (attack-pattern)

Used by threat actors

Reports & references

  • Kaspersky — 99204 (report)
  • ptsecurity.com — Antisandbox Techniques (report)
  • intezer.com — The Evolution Of Apt15S Codebase 2020 (report)
  • ESET — Okrum Ke3Chang Targets Diplomatic Missions (report)
  • malpedia.caad.fkie.fraunhofer.de — Win.Okrum (report)
  • MITRE ATT&CK — S0439 (report)
  • ESET — Eset Okrum And Ketrican (report)

External references