SysUpdate
- ID
- S0663
- Type
- Malware
- Associated names
- HyperSSL, Soldier, FOCUSFJORD
- Platforms
- Windows, Linux
- Source
- attack.mitre.org
- MITRE last modified
- 22 Oct 2025
SysUpdate is a backdoor written in C++ that has been used by Threat Group-3390 since at least 2020.[1]
Techniques used (31)
- T1005 Data from Local System
- T1007 System Service Discovery
- T1016 System Network Configuration Discovery
- T1016.001 Internet Connection Discovery
- T1027.002 Software Packing
- T1027.011 Fileless Storage
- T1027.013 Encrypted/Encoded File
- T1033 System Owner/User Discovery
- T1036.004 Masquerade Task or Service
- T1041 Exfiltration Over C2 Channel
- T1047 Windows Management Instrumentation
- T1057 Process Discovery
- T1070.004 File Deletion
- T1071.004 DNS
- T1082 System Information Discovery
- T1083 File and Directory Discovery
- T1105 Ingress Tool Transfer
- T1106 Native API
- T1112 Modify Registry
- T1113 Screen Capture
- T1132.001 Standard Encoding
- T1140 Deobfuscate/Decode Files or Information
- T1543.002 Systemd Service
- T1543.003 Windows Service
- T1547.001 Registry Run Keys / Startup Folder
- T1553.002 Code Signing
- T1564.001 Hidden Files and Directories
- T1569.002 Service Execution
- T1573.001 Symmetric Cryptography
- T1574.001 DLL
- T1680 Local Storage Discovery