Overview

overview

7

Static

static

3

Chernobyl.exe

windows10-2004-x64

Chernobyl.exe

windows10-ltsc_2021-x64

Chernobyl.exe

windows11-21h2-x64

Analysis

  • user interaction
    yes
  • max time kernel
    5s
  • max time network
    64s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    30/07/2026, 04:38

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Errors

Reason
Machine shutdown

General

  • Target
    Chernobyl.exe
  • Size 1.2MB
  • Sample260730-e9k82scp9t
  • SHA256 2342b3d3120400baea76a500a710fc239ea8d1c587459c4c20bc070e44281c27
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
7/10
bootkitdiscoveryexecutionpersistenceprivilege_escalation

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 4 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 AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe
    "C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe"
    1⤵
    • Checks computer location settings
    • Writes to the Master Boot Record (MBR)
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3140
    • 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:1144
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c reg delete HKCR /f
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4300
      • C:\Windows\SysWOW64\reg.exe
        reg delete HKCR /f
        3⤵
        • Modifies system executable filetype association
        • System Location Discovery: System Language Discovery
        • Modifies registry class
        PID:3088
  • C:\Windows\system32\AUDIODG.EXE
    C:\Windows\system32\AUDIODG.EXE 0x4bc 0x4f4
    1⤵
      PID:4368

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

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          Downloads

          mbr_temp.asm
          • Path C:\Users\Admin\AppData\Local\Temp\mbr_temp.asm
          • Size 1KB
          • SHA256 9fdfd968643c046a87defa558840a6a523324d8b7d447deb5cd089ab7e456317
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          mbr_temp.bin
          • Path C:\Users\Admin\AppData\Local\Temp\mbr_temp.bin
          • Size 512B
          • SHA256 032c085f82cde3370e27119e29392d0bec4df704a6c431e9461f8bf1a32a5a06
          • 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/1144-9-0x0000000000400000-0x0000000000539000-memory.dmp
          Download

          memory/3140-0-0x0000000000310000-0x0000000000450000-memory.dmp
          Download

          memory/3140-1-0x0000000004E60000-0x0000000004E70000-memory.dmp
          Download

          memory/3140-12-0x00000000056C0000-0x0000000005752000-memory.dmp
          Download

          memory/3140-15-0x0000000004E60000-0x0000000004E70000-memory.dmp
          Download