Overview

overview

10

Static

static

3

a3f884dfa3...3d.exe

windows10-2004-x64

10

a3f884dfa3...3d.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    133s
  • platform
    windows11-21h2_x64
  • resource
    win11-20251015-en
  • resource tags

    arch:x64arch:x86image:win11-20251015-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    21/11/2025, 10:26

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General

  • Target
    a3f884dfa336e6524e4870154c3ab8217e5f34fa6baae5281e3d36b179b8a83d.exe
  • Size 178KB
  • Sample251121-mgr5wseq5s
  • SHA256 a3f884dfa336e6524e4870154c3ab8217e5f34fa6baae5281e3d36b179b8a83d
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
defense_evasionevasionexecutionzarokimpactpersistenceransomwarespywarestealer

Malware Config

Extracted

Path

  • C:\ProgramData\Adobe\Setup\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\README_NOW_ZAROK.txt

  • zarok

Ransom Note
  • Greeting, We are Zarok Ransomware group. We have infected your computer... How to recover your files and your privacy without any leaks or problems? 1. Buy Bitcoin How to buy Bitcoin? Go on 'Exodus wallet' or others wallet. Buy 200 EUR in BTC (Bitcoin) 2. Pay How to pay? First thing you go on your wallet. Go on pay or something like that and select the adress to receive. Our adress: bc1qe4ccx4tdm0acl7809et4u5jk8z78x7gwj3zmx5 Just pay and sent us on Telegram: @stfuhq the proof. 3. After the payment + verification You will receive a ransomware decrypter. We delete all your data and others shit without any problems. You will recover all of your stuff just wait for it. 4. If u don't pay? First all of your data are leaked on the web (ALL). You will lost every fucking files and folders do you have. - Zarok Ransomware.

Signatures

  • Zarok Ransomware

    Zarok is a ransomware, appending a random four-character extension.

    ransomwarezarok
  • Zarok family
    zarok
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomwaredefense_evasionimpactexecution
  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
    ransomwareevasion
  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

    ransomware
  • Disables Task Manager via registry modification
    defense_evasion
  • Drops startup file 2 IoCs
  • Executes dropped EXE 2 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

    spywarestealer
  • Adds Run key to start application 2 TTPs 1 IoCs
    persistence
  • Drops desktop.ini file(s) 64 IoCs
  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
    ransomware
  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 4 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Interacts with shadow copies 3 TTPs 1 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

    ransomware
  • Modifies registry class 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
    ransomware
  • Suspicious behavior: AddClipboardFormatListener 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 42 IoCs
  • Suspicious use of AdjustPrivilegeToken 51 IoCs
  • Suspicious use of WriteProcessMemory 20 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 service COM API

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

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\a3f884dfa336e6524e4870154c3ab8217e5f34fa6baae5281e3d36b179b8a83d.exe
    "C:\Users\Admin\AppData\Local\Temp\a3f884dfa336e6524e4870154c3ab8217e5f34fa6baae5281e3d36b179b8a83d.exe"
    1⤵
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1184
    • C:\Users\Admin\AppData\Roaming\winit32.exe
      "C:\Users\Admin\AppData\Roaming\winit32.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4456
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:812
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:3880
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:5952
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3320
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:3648
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:5788
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:956
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:4692
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\README_NOW_ZAROK.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:5076
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4924
  • C:\Users\Admin\AppData\Roaming\winit32.exe
    C:\Users\Admin\AppData\Roaming\winit32.exe
    1⤵
    • Executes dropped EXE
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    PID:4880
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4564
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:5876
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:4708

    Network

          MITRE ATT&CK Enterprise v16

          Reconnaissance

          Resource Development

          Initial Access

          Execution

          Command and Scripting Interpreter

          1
          T1059

          Windows Management Instrumentation

          1
          T1047

          Persistence

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Privilege Escalation

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Defense Evasion

          Direct Volume Access

          1
          T1006

          Indicator Removal

          3
          T1070

          File Deletion

          3
          T1070.004

          Modify Registry

          2
          T1112

          Credential Access

          Credentials from Password Stores

          1
          T1555

          Credentials from Web Browsers

          1
          T1555.003

          Unsecured Credentials

          1
          T1552

          Credentials In Files

          1
          T1552.001

          Discovery

          Peripheral Device Discovery

          1
          T1120

          Query Registry

          2
          T1012

          System Information Discovery

          2
          T1082

          Lateral Movement

          Collection

          Data from Local System

          1
          T1005

          Command and Control

          Exfiltration

          Impact

          Defacement

          1
          T1491

          Inhibit System Recovery

          4
          T1490

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          README_NOW_ZAROK.txt
          • Path C:\ProgramData\Adobe\Setup\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\README_NOW_ZAROK.txt
          • Size 855B
          • SHA256 9cf869f2f15a623d76db31df621a856d72483b121f0220fd2807a16a25316f70
          • MD5 SHA1 SHA512
          Submit Download

          a3f884dfa336e6524e4870154c3ab8217e5f34fa6baae5281e3d36b179b8a83d.exe.log
          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\a3f884dfa336e6524e4870154c3ab8217e5f34fa6baae5281e3d36b179b8a83d.exe.log
          • Size 1KB
          • SHA256 5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210
          • MD5 SHA1 SHA512
          Submit Download

          winit32.exe
          • Path C:\Users\Admin\AppData\Roaming\winit32.exe
          • Size 178KB
          • SHA256 a3f884dfa336e6524e4870154c3ab8217e5f34fa6baae5281e3d36b179b8a83d
          • MD5 SHA1 SHA512 SSDEEP
          Submit Download

          Microsoft Edge.lnk
          • Path C:\Users\Admin\Desktop\Microsoft Edge.lnk
          • Size 1B
          • SHA256 8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
          • MD5 SHA1 SHA512
          Submit Download

          memory/1184-0-0x0000000000800000-0x0000000000832000-memory.dmp
          Download

          memory/1184-1-0x000000001B540000-0x000000001B550000-memory.dmp
          Download

          memory/4456-14-0x0000000001400000-0x0000000001410000-memory.dmp
          Download

          memory/4456-1302-0x0000000001400000-0x0000000001410000-memory.dmp
          Download