Overview

overview

7

Static

static

3

chernobyl mbr .exe

windows10-2004-x64

7

chernobyl mbr .exe

windows11-ltsc_2024-x64

Analysis

  • user interaction
    yes
  • max time kernel
    4s
  • max time network
    34s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260911-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    28/09/2026, 12:45

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General

  • Target
    chernobyl mbr .exe
  • Size 3.2MB
  • Sample260928-py4alathmf
  • SHA256 79b15418ed5af280f8563206b5d449bb67b83f85420fa06912783b1cdde06576
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
7/10
bootkitdiscoveryexecutionpersistenceprivilege_escalationransomware

Malware Config

Signatures

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Event Triggered Execution: Component Object Model Hijacking 1 TTPs

    Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

    persistenceprivilege_escalation
  • Executes dropped EXE 1 IoCs
  • Modifies system executable filetype association 2 TTPs 34 IoCs
    persistence
  • Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

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

    bootkitpersistence
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Executes a command shell one-liner 1 TTPs 1 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

    execution
  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

    discovery
  • Modifies registry class 64 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

    persistence
  • Uses Volume Shadow Copy WMI provider

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\chernobyl mbr .exe
    "C:\Users\Admin\AppData\Local\Temp\chernobyl mbr .exe"
    1⤵
    • Checks computer location settings
    • Writes to the Master Boot Record (MBR)
    • Suspicious use of WriteProcessMemory
    PID:1584
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /k reg delete HKCR /f
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:4844
      • C:\Windows\system32\reg.exe
        reg delete HKCR /f
        3⤵
        • Modifies system executable filetype association
        • Modifies registry class
        PID:4712
    • C:\Users\Admin\AppData\Local\Temp\nasm.exe
      "nasm.exe" -f bin mbr_temp.asm -o mbr_temp.bin
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      PID:2320
  • C:\Windows\system32\AUDIODG.EXE
    C:\Windows\system32\AUDIODG.EXE 0x450 0x498
    1⤵
      PID:1784

    Network

          MITRE ATT&CK Enterprise v16

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          Downloads

          mbr_temp.asm
          • Path C:\Users\Admin\AppData\Local\Temp\mbr_temp.asm
          • Size 702B
          • SHA256 7dd19a7ee6898a8081630b30f8f3cb9018e7a8b775559d9b4f25181c483a3bfc
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          mbr_temp.bin
          • Path C:\Users\Admin\AppData\Local\Temp\mbr_temp.bin
          • Size 512B
          • SHA256 4a26ce3f89739c4bb3a4272da3e20677417c283ae5e405e85e3ce47ca8542669
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          nasm.exe
          • Path C:\Users\Admin\AppData\Local\Temp\nasm.exe
          • Size 1.2MB
          • SHA256 a4735165141570d966b577d594c0541c29baed4978078c1c7237b855f8592a87
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          memory/1584-0-0x0000000000100000-0x0000000000442000-memory.dmp
          Download

          memory/1584-1-0x000000001B150000-0x000000001B160000-memory.dmp
          Download

          memory/1584-20-0x000000001CD90000-0x000000001CF39000-memory.dmp
          Download

          memory/1584-21-0x000000001B150000-0x000000001B160000-memory.dmp
          Download

          memory/1584-22-0x000000001CD90000-0x000000001CF39000-memory.dmp
          Download

          memory/1584-23-0x000000001CD90000-0x000000001CF39000-memory.dmp
          Download

          memory/1584-24-0x000000001CD90000-0x000000001CF39000-memory.dmp
          Download

          memory/1584-25-0x000000001CD90000-0x000000001CF39000-memory.dmp
          Download

          memory/2320-16-0x0000000000400000-0x0000000000539000-memory.dmp
          Download