General

  • Target

    Chernobyl.exe

  • Size

    423KB

  • Sample

    240303-xrmy2aee91

  • MD5

    42b985c803f65d080d32c4739a670ff1

  • SHA1

    9ffaa06fe681b886b13d75f87cdb506afad0076e

  • SHA256

    99297c9266dbd506808ecd06ba6e67c8b01806e8fb7f1dd61783b35c3bb6aa58

  • SHA512

    1eccbf3188bd270546bd730759b4e63f814540fd80e6e9e0f47391886527c092a9e42f629e265aadfe6a79c52ba6443cca615fede5cb68098fb2c543e4bedff8

  • SSDEEP

    6144:RebuEko022222222222222222222222222222222222222222222222222222220:ytH0bOZzv4TatsNqaJR

Malware Config

Targets

    • Target

      Chernobyl.exe

    • Size

      423KB

    • MD5

      42b985c803f65d080d32c4739a670ff1

    • SHA1

      9ffaa06fe681b886b13d75f87cdb506afad0076e

    • SHA256

      99297c9266dbd506808ecd06ba6e67c8b01806e8fb7f1dd61783b35c3bb6aa58

    • SHA512

      1eccbf3188bd270546bd730759b4e63f814540fd80e6e9e0f47391886527c092a9e42f629e265aadfe6a79c52ba6443cca615fede5cb68098fb2c543e4bedff8

    • SSDEEP

      6144:RebuEko022222222222222222222222222222222222222222222222222222220:ytH0bOZzv4TatsNqaJR

    • 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