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Home/ATT&CK/Software/S0439
MITRE ATT&CK Malware

Okrum (S0439)

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[Okrum](https://attack.mitre.org/software/S0439) is a Windows backdoor that has been seen in use since December 2016 with strong links to [Ke3chang](https://attack.mitre.org/groups/G0004).(Citation: ESET Okrum July 2019)

Platforms: Windows

▪Techniques implemented (34)

T1003.005Cached Domain CredentialsT1547.009Shortcut ModificationT1560.001Archive via UtilityT1497.001System ChecksT1497.002User Activity Based ChecksT1105Ingress Tool TransferT1059.003Windows Command ShellT1497.003Time Based ChecksT1543.003Windows ServiceT1016System Network Configuration DiscoveryT1071.001Web ProtocolsT1001Data ObfuscationT1053.005Scheduled TaskT1027.003SteganographyT1036.004Masquerade Task or ServiceT1033System Owner/User DiscoveryT1082System Information DiscoveryT1041Exfiltration Over C2 ChannelT1132.001Standard EncodingT1569.002Service ExecutionT1134.001Token Impersonation/TheftT1083File and Directory DiscoveryT1564.001Hidden Files and DirectoriesT1090.002External ProxyT1573.001Symmetric CryptographyT1140Deobfuscate/Decode Files or InformationT1070.004File DeletionT1547.001Registry Run Keys / Startup FolderT1049System Network Connections DiscoveryT1560.003Archive via Custom MethodT1056.001KeyloggingT1124System Time DiscoveryT1003.001LSASS MemoryT1001.003Protocol or Service Impersonation

▪Used by groups (1)

G0004Ke3chang
S0439on MITRE ATT&CK →

MITRE ATT&CK® is a registered trademark of The MITRE Corporation. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.