Analysis

  • max time kernel
    122s
  • max time network
    123s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    13-12-2024 14:00

General

  • Target

    crynox.exe

  • Size

    299KB

  • MD5

    e6e2f46331a60acfc399f10ff842345d

  • SHA1

    514945da2f3518753b22df05786e6dce446d7ec1

  • SHA256

    c50584f0f5cccb28d192fb2540077792732b8afe1eb887cc3657d60980d9ad02

  • SHA512

    08842cb745dc04c6a2f0233b69647502cdc2920c2f520415507b98d54b7086f15282ba177baf93c11fbd6415467f1fb84df5a05a8d1923f47737344b6843333c

  • SSDEEP

    3072:drQkc9kuFo+p2afIyTBjMnuNjg710OpYVm/+FbN/damWsJ7gUev+Tvx:95c9Vf2qIuNLiapdz1JMdv+T

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad\Decrypt_My_File.txt

Ransom Note
CRYNOX Ransomware ======================================= Oh No! Your files has been encrypted. What happened to my files ? All of your files were protected by a strong encryption with RSA & AES More information about the encryption keys using RSA4096 can be found here: RSA : http://en.wikipedia.org/wiki/RSA_(cryptosystem) AES : https://en.wikipedia.org/wiki/Advanced_Encryption_Standard How did this happen ? Specially for your PC was generated personal RSA & AES, both public and private. ALL YOUR FILES were encrypted with High grade cryption. Decrypting of your files is only possible with the help of the key and decryptor, which is on our Secret Server What do I do ? So, there are two ways you can choose: leave your data encrypted, or start obtaining BITCOIN NOW! , and restore your data easy way. If You have really valuable data, you better not waste your time, because there is no other way to get your files, except make a payment. For more specific instructions, please visit your personal home page, there are a few different addresses pointing to your page below: 1. https://crynoxaowlkauirfhaaiuefjkebfiaeufaebiefuakbjaiurkjahbfiajkfa.vercel.app/decryptor.html If for some reasons the addresses are not available, follow these steps: 1. Open your email application. After opening the email application : 2. Contact me at : [email protected] 3. Write an email about the ransomware and send it to us. 4. Wait until we replied to you about the decryptor application. ---------------- IMPORTANT INFORMATION------------------------ Support Email : [email protected]
URLs

https://crynoxaowlkauirfhaaiuefjkebfiaeufaebiefuakbjaiurkjahbfiajkfa.vercel.app/decryptor.html

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 3 IoCs
  • Chaos family
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Renames multiple (217) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

  • Disables Task Manager via registry modification
  • Drops startup file 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 3 TTPs

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

  • Drops desktop.ini file(s) 64 IoCs
  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Interacts with shadow copies 3 TTPs 1 IoCs

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

  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of WriteProcessMemory 30 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.

  • Uses Volume Shadow Copy service COM API

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\crynox.exe
    "C:\Users\Admin\AppData\Local\Temp\crynox.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2216
    • C:\Users\Admin\AppData\Roaming\Antimalware Service Executables.exe
      "C:\Users\Admin\AppData\Roaming\Antimalware Service Executables.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2124
      • 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:3032
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2376
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2408
      • 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:2156
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2836
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:3040
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2632
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:1680
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\Decrypt_My_File.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:1564
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2868
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1856
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:2392
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
        PID:1972

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad\Decrypt_My_File.txt

        Filesize

        1KB

        MD5

        15f57e55659f5dabf91fb3cf52e57e2a

        SHA1

        aa65f8c50caae971f0d4dc1b1f0966fd24da80b1

        SHA256

        c1fb308357cca35f9982722bdd7c3a208cd8bb0568dd9ffba6fa4f2d98afc41c

        SHA512

        548435be6e6bcce47f9d2a54571ea541ac4864a27a4728c4684dd8acbf2ad5a69a55ac0e86e2292f72def6decf282c6765b630a25d98d64f728ef837e24fdb00

      • C:\Users\Admin\AppData\Roaming\Antimalware Service Executables.exe

        Filesize

        299KB

        MD5

        e6e2f46331a60acfc399f10ff842345d

        SHA1

        514945da2f3518753b22df05786e6dce446d7ec1

        SHA256

        c50584f0f5cccb28d192fb2540077792732b8afe1eb887cc3657d60980d9ad02

        SHA512

        08842cb745dc04c6a2f0233b69647502cdc2920c2f520415507b98d54b7086f15282ba177baf93c11fbd6415467f1fb84df5a05a8d1923f47737344b6843333c

      • C:\Users\Admin\AppData\Roaming\DisableClear.ppsm

        Filesize

        1B

        MD5

        d1457b72c3fb323a2671125aef3eab5d

        SHA1

        5bab61eb53176449e25c2c82f172b82cb13ffb9d

        SHA256

        8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

        SHA512

        ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

      • memory/2124-7-0x0000000001330000-0x0000000001380000-memory.dmp

        Filesize

        320KB

      • memory/2124-9-0x000007FEF5520000-0x000007FEF5F0C000-memory.dmp

        Filesize

        9.9MB

      • memory/2124-76-0x000007FEF5520000-0x000007FEF5F0C000-memory.dmp

        Filesize

        9.9MB

      • memory/2124-1067-0x000007FEF5520000-0x000007FEF5F0C000-memory.dmp

        Filesize

        9.9MB

      • memory/2216-0-0x000007FEF5523000-0x000007FEF5524000-memory.dmp

        Filesize

        4KB

      • memory/2216-1-0x0000000000080000-0x00000000000D0000-memory.dmp

        Filesize

        320KB