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Felismus

Felismus is a modular backdoor that has been used by Sowbug. [1] [2]

ID: S0171
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Type: MALWARE
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Platforms: Windows
Version: 1.1
Created: 16 January 2018
Last Modified: 30 March 2020
Enterprise Layer
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Techniques Used

Domain ID Name Use
Enterprise T1071 .001 Application Layer Protocol: Web Protocols

Felismus uses HTTP for C2.[2]
Enterprise T1059 .003 Command and Scripting Interpreter: Windows Command Shell

Felismus uses command line for execution.[2]
Enterprise T1132 .001 Data Encoding: Standard Encoding

Some Felismus samples use a custom method for C2 traffic that utilizes Base64.[2]
Enterprise T1573 .001 Encrypted Channel: Symmetric Cryptography

Some Felismus samples use a custom encryption method for C2 traffic that utilizes AES and multiple keys.[2]
Enterprise T1105 Ingress Tool Transfer

Felismus can download files from remote servers.[2]
Enterprise T1036 .005 Masquerading: Match Legitimate Name or Location

Felismus has masqueraded as legitimate Adobe Content Management System files.[2]
Enterprise T1518 .001 Software Discovery: Security Software Discovery

Felismus checks for processes associated with anti-virus vendors.[2]
Enterprise T1082 System Information Discovery

Felismus collects the system information, including hostname and OS version, and sends it to the C2 server.[2]
Enterprise T1016 System Network Configuration Discovery

Felismus collects the victim LAN IP address and sends it to the C2 server.[2]
Enterprise T1033 System Owner/User Discovery

Felismus collects the current username and sends it to the C2 server.[2]

Groups That Use This Software

ID Name References
G0054 Sowbug

[1]

References

  1. Symantec Security Response. (2017, November 7). Sowbug: Cyber espionage group targets South American and Southeast Asian governments. Retrieved November 16, 2017.
  1. Somerville, L. and Toro, A. (2017, March 30). Playing Cat & Mouse: Introducing the Felismus Malware. Retrieved November 16, 2017.