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Home/ATT&CK/Software/S0663
MITRE ATT&CK Malware

SysUpdate (S0663)

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[SysUpdate](https://attack.mitre.org/software/S0663) is a backdoor written in C++ that has been used by [Threat Group-3390](https://attack.mitre.org/groups/G0027) since at least 2020.(Citation: Trend Micro Iron Tiger April 2021)

Platforms: Windows, Linux

▪Techniques implemented (31)

T1071.004DNST1573.001Symmetric CryptographyT1007System Service DiscoveryT1140Deobfuscate/Decode Files or InformationT1680Local Storage DiscoveryT1132.001Standard EncodingT1033System Owner/User DiscoveryT1057Process DiscoveryT1553.002Code SigningT1005Data from Local SystemT1027.011Fileless StorageT1083File and Directory DiscoveryT1016.001Internet Connection DiscoveryT1105Ingress Tool TransferT1036.004Masquerade Task or ServiceT1041Exfiltration Over C2 ChannelT1027.013Encrypted/Encoded FileT1082System Information DiscoveryT1113Screen CaptureT1543.002Systemd ServiceT1070.004File DeletionT1112Modify RegistryT1564.001Hidden Files and DirectoriesT1574.001DLLT1547.001Registry Run Keys / Startup FolderT1016System Network Configuration DiscoveryT1027.002Software PackingT1106Native APIT1569.002Service ExecutionT1047Windows Management InstrumentationT1543.003Windows Service

▪Used by groups (1)

G0027Threat Group-3390
S0663on 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.