S-Type is a backdoor that was used by Dust Storm from 2013 to 2014. [1]

ID: S0085
Platforms: Windows
Version: 1.1
Created: 31 May 2017
Last Modified: 20 March 2020

Techniques Used

Domain ID Name Use
Enterprise T1087 .001 Account Discovery: Local Account

S-Type runs the command net user on a victim. S-Type also runs tests to determine the privilege level of the compromised user.[1]

Enterprise T1071 .001 Application Layer Protocol: Web Protocols

S-Type uses HTTP for C2.[1]

Enterprise T1547 .001 Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder

S-Type may create a .lnk file to itself that is saved in the Start menu folder. It may also create the Registry key HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ IMJPMIJ8.1{{3 characters of Unique Identifier}}.[1]

.009 Boot or Logon Autostart Execution: Shortcut Modification

S-Type may create the file %HOMEPATH%\Start Menu\Programs\Startup\Realtek {{Unique Identifier}}.lnk, which points to the malicious msdtc.exe file already created in the %CommonFiles% directory.[1]

Enterprise T1136 .001 Create Account: Local Account

S-Type may create a temporary user on the system named "Lost_{{Unique Identifier}}" with the password "pond~!@6"{{Unique Identifier}}."[1]

Enterprise T1132 .001 Data Encoding: Standard Encoding

S-Type uses Base64 encoding for C2 traffic.[1]

Enterprise T1008 Fallback Channels

S-Type primarily uses port 80 for C2, but falls back to ports 443 or 8080 if initial communication fails.[1]

Enterprise T1036 .005 Masquerading: Match Legitimate Name or Location

S-Type may save itself as a file named msdtc.exe, which is also the name of the legitimate Microsoft Distributed Transaction Coordinator service binary.[1][2]

Enterprise T1082 System Information Discovery

The initial beacon packet for S-Type contains the operating system version and file system of the victim.[1]

Enterprise T1007 System Service Discovery

S-Type runs the command net start on a victim.[1]

Groups That Use This Software

ID Name References
G0031 Dust Storm