General

  • Target

    Chernobyl.exe

  • Size

    534KB

  • Sample

    240303-z9gk3sgg8w

  • MD5

    a70b779e49a90f38aa8c4be7f4eaa4d2

  • SHA1

    a4b09eef6d70b7ee9c4cd6a530560b914acfacbe

  • SHA256

    de9900ede22fbb6c47216cafce4f2bb328ce2e5a3b4889583dda25926d3d1dd1

  • SHA512

    980b489ea3ccd6103d6d23278c8c387f01108ef8abe684817750ab4f8d85b498d8c6a4c7f227c99aa46ed1e2838ce77ae9ea281490b695da6c892bdbb387027f

  • SSDEEP

    12288:9HwMxOZzv4TatsNqaJiGH2OZzv4TatsNqaJn:9Jx6zvIXqawGH26zvIXqap

Malware Config

Targets

    • Target

      Chernobyl.exe

    • Size

      534KB

    • MD5

      a70b779e49a90f38aa8c4be7f4eaa4d2

    • SHA1

      a4b09eef6d70b7ee9c4cd6a530560b914acfacbe

    • SHA256

      de9900ede22fbb6c47216cafce4f2bb328ce2e5a3b4889583dda25926d3d1dd1

    • SHA512

      980b489ea3ccd6103d6d23278c8c387f01108ef8abe684817750ab4f8d85b498d8c6a4c7f227c99aa46ed1e2838ce77ae9ea281490b695da6c892bdbb387027f

    • SSDEEP

      12288:9HwMxOZzv4TatsNqaJiGH2OZzv4TatsNqaJn:9Jx6zvIXqawGH26zvIXqap

    • 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