General

  • Target

    https://cdn.fastly.steamstatic.com/client/installer/SteamSetup.exe

  • Sample

    250109-bc5pms1lg1

Malware Config

Targets

    • Target

      https://cdn.fastly.steamstatic.com/client/installer/SteamSetup.exe

    • Downloads MZ/PE file

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Executes dropped EXE

    • Loads dropped DLL

    • Adds Run key to start application

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Legitimate hosting services abused for malware hosting/C2

    • Detected potential entity reuse from brand MICROSOFT.

    • Drops file in System32 directory

MITRE ATT&CK Enterprise v15

Tasks