General

  • Target

    Chernobyl.exe

  • Size

    424KB

  • Sample

    240303-z3l7zshe42

  • MD5

    101d28706ba17a0ffabaf6b2ec334df9

  • SHA1

    5ac0b8ff7705fe4682bc0504a9add7b7f651cea3

  • SHA256

    0b5ebbdb5d04ee14f1c3fb5815bb3afea991d44beb4d33771226d725849ae0eb

  • SHA512

    bea84711d4341b08294e9f83d793375afc2b5cd0652bafa5749900506856a45dd21c225c9b009757924b3e47cc00a27237ebbeac1aea2cbe11e1055882209e76

  • SSDEEP

    6144:CfJzhWb+fo02222222222222222222222222222222222222222222222222222J:CfJzh0tH01OZzv4TatsNqaJR

Malware Config

Targets

    • Target

      Chernobyl.exe

    • Size

      424KB

    • MD5

      101d28706ba17a0ffabaf6b2ec334df9

    • SHA1

      5ac0b8ff7705fe4682bc0504a9add7b7f651cea3

    • SHA256

      0b5ebbdb5d04ee14f1c3fb5815bb3afea991d44beb4d33771226d725849ae0eb

    • SHA512

      bea84711d4341b08294e9f83d793375afc2b5cd0652bafa5749900506856a45dd21c225c9b009757924b3e47cc00a27237ebbeac1aea2cbe11e1055882209e76

    • SSDEEP

      6144:CfJzhWb+fo02222222222222222222222222222222222222222222222222222J:CfJzh0tH01OZzv4TatsNqaJR

    • 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