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
- Ke3chang (threat-actor)
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)