General

  • Target

    Chernobyl.exe

  • Size

    423KB

  • Sample

    240303-zm6axsgh87

  • MD5

    eab1b06ec4eb0e4fb8a4ddb111de3842

  • SHA1

    1cad235f7d73eb9d42e34b155e1a7da6e119039c

  • SHA256

    f71a2fae22ef13b3691ed0f9deaaa59f36c96c32e40ae44d9811c33fb9f166f0

  • SHA512

    09b22abc0d104db5accfcb2dcc7dce707203ff6f547a4312c3fe39e8d4afe60249c237288d2e6bb80218a336de8c919b60ea848c38ea4ed3d6bc9e3b5241d051

  • SSDEEP

    6144:g3qhb34o0222222222222222222222222222222222222222222222222222222V:gytH0FOZzv4TatsNqaJR

Malware Config

Targets

    • Target

      Chernobyl.exe

    • Size

      423KB

    • MD5

      eab1b06ec4eb0e4fb8a4ddb111de3842

    • SHA1

      1cad235f7d73eb9d42e34b155e1a7da6e119039c

    • SHA256

      f71a2fae22ef13b3691ed0f9deaaa59f36c96c32e40ae44d9811c33fb9f166f0

    • SHA512

      09b22abc0d104db5accfcb2dcc7dce707203ff6f547a4312c3fe39e8d4afe60249c237288d2e6bb80218a336de8c919b60ea848c38ea4ed3d6bc9e3b5241d051

    • SSDEEP

      6144:g3qhb34o0222222222222222222222222222222222222222222222222222222V:gytH0FOZzv4TatsNqaJR

    • Contains code to disable Windows Defender

      A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

    • Modifies WinLogon for persistence

    • UAC bypass

    • Disables RegEdit via registry modification

    • Disables Task Manager via registry modification

    • Possible privilege escalation attempt

    • Modifies file permissions

    • Modifies system executable filetype association

    • Checks whether UAC is enabled

    • Modifies WinLogon

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

    • Drops file in System32 directory

    • Sets desktop wallpaper using registry

MITRE ATT&CK Enterprise v15

Tasks