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General

  • Target

    b605c1dc4ebfc6fa7b93c1c37833114e37cc150f6ea3d1c19696116b44231558

  • Size

    502KB

  • Sample

    241203-zyjlastra1

  • MD5

    3eeeb1f49079f046982efdbb06982a44

  • SHA1

    fedc3f54f621cd91d88677371386c7c6c26743c1

  • SHA256

    b605c1dc4ebfc6fa7b93c1c37833114e37cc150f6ea3d1c19696116b44231558

  • SHA512

    829a085c012b8dbcd6c215a48b371b41171b75f3943aaac2dec50c7912f6b85d072eeaf5c6ebb997666dfec0cf3c038f249eb5c0dd516bc7a4c771384d6fee91

  • SSDEEP

    12288:PyveQB/fTHIGaPkKEYzURNAwbAg3/iBsNC3v6R/ZL:PuDXTIGaPhEYzUzA0cBf3CNp

Malware Config

Targets

    • Target

      b605c1dc4ebfc6fa7b93c1c37833114e37cc150f6ea3d1c19696116b44231558

    • Size

      502KB

    • MD5

      3eeeb1f49079f046982efdbb06982a44

    • SHA1

      fedc3f54f621cd91d88677371386c7c6c26743c1

    • SHA256

      b605c1dc4ebfc6fa7b93c1c37833114e37cc150f6ea3d1c19696116b44231558

    • SHA512

      829a085c012b8dbcd6c215a48b371b41171b75f3943aaac2dec50c7912f6b85d072eeaf5c6ebb997666dfec0cf3c038f249eb5c0dd516bc7a4c771384d6fee91

    • SSDEEP

      12288:PyveQB/fTHIGaPkKEYzURNAwbAg3/iBsNC3v6R/ZL:PuDXTIGaPhEYzUzA0cBf3CNp

    • Detect Umbral payload

    • Umbral

      Umbral stealer is an opensource moduler stealer written in C#.

    • Umbral family

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Drops file in Drivers directory

    • Checks computer location settings

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

    • Executes dropped EXE

    • Reads user/profile data of web browsers

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

    • Legitimate hosting services abused for malware hosting/C2

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

MITRE ATT&CK Enterprise v15

Tasks