General

  • Target

    https://bingwallpaper.microsoft.com/upsell/redirect/?brand=bing&pc=W013

  • Sample

    231019-vsrmhaag65

Malware Config

Targets

    • Target

      https://bingwallpaper.microsoft.com/upsell/redirect/?brand=bing&pc=W013

    • Blocklisted process makes network request

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Registers COM server for autorun

    • Adds Run key to start application

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Detected potential entity reuse from brand microsoft.

    • Sets desktop wallpaper using registry

MITRE ATT&CK Enterprise v15

Tasks