Communication Through Removable Media

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Communication Through Removable Media
Technique
ID T1092
Tactic Command and Control
Platform Windows Server 2003, Windows Server 2008, Windows Server 2012, Windows XP, Windows 7, Windows 8, Windows Server 2003 R2, Windows Server 2008 R2, Windows Server 2012 R2, Windows Vista, Windows 8.1, Linux, Windows 10, MacOS, OS X
Data Sources File monitoring, Data loss prevention
Requires Network No

Adversaries can perform command and control between compromised hosts on potentially disconnected networks using removable media to transfer commands from system to system. Both systems would need to be compromised, with the likelihood that an Internet-connected system was compromised first and the second through lateral movement by Replication Through Removable Media. Commands and files would be relayed from the disconnected system to the Internet-connected system to which the adversary has direct access.

Examples

  • APT28 uses a tool that captures information from air-gapped computers via an infected USB and transfers it to network-connected computer when the USB is inserted.1
  • Part of APT28's operation involved using CHOPSTICK modules to copy itself to air-gapped machines, using files written to USB sticks to transfer data and command traffic.231
  • USBStealer drops commands for a second victim onto a removable media drive inserted into the first victim, and commands are executed when the drive is inserted into the second victim.4

Mitigation

Disable Autorun if it is unnecessary.5 Disallow or restrict removable media at an organizational policy level if they are not required for business operations.6

Detection

Monitor file access on removable media. Detect processes that execute when removable media is mounted.