Resubmissions

14-12-2024 02:58

241214-dgdg3avlgr 10

13-12-2024 13:41

241213-qzkqbasjar 10

Analysis

  • max time kernel
    16s
  • max time network
    17s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    13-12-2024 13:41

General

  • Target

    crynox.exe

  • Size

    308KB

  • MD5

    726620b8147063804324e16bf7e847b0

  • SHA1

    0c4831ee49e3114bfd590dbd77b66890af172869

  • SHA256

    06f70e1b456e0eb7054e2b341ff9c6feb562e3d584ca127680b9fc6b9cf065f8

  • SHA512

    f907c5afae6b20e4d9d837d9a970b256ae405a88d0fbc5dd391133865fc80e37cdba95c907c9b6009bc2e61bc0182d904622c6b4535776ada90c4f9d0519572e

  • SSDEEP

    3072:k12QKc97OFo+p2afIyTBjMnuNjg710OpYVm/+FbN/damWsJ9gUev+Tvx:c2rc9Af2qIuNLiapdz1Jqdv+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:2096
    • 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:2300
      • 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:804
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:112
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2644
      • 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:2636
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2692
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2396
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2236
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:2184
      • 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:1608
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2976
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2428
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:1388
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
        PID:548

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        6KB

        MD5

        38ef492a7eb7d2617cc3abe708e7ee91

        SHA1

        43b02b04ddd3389a72984e9294de343826fbdf18

        SHA256

        ad5b201c3bd188e985cec4201e0cf73a44979a4ad2d10f38935ed242aa7387a2

        SHA512

        070505c942f97e1dc68f60472bb4bea69c308a0bd3afe3faf429374df48c904253f39dd540af2d67de7049f3a42d30185d98445063a5193c04b7347d827ad66c

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

        Filesize

        308KB

        MD5

        726620b8147063804324e16bf7e847b0

        SHA1

        0c4831ee49e3114bfd590dbd77b66890af172869

        SHA256

        06f70e1b456e0eb7054e2b341ff9c6feb562e3d584ca127680b9fc6b9cf065f8

        SHA512

        f907c5afae6b20e4d9d837d9a970b256ae405a88d0fbc5dd391133865fc80e37cdba95c907c9b6009bc2e61bc0182d904622c6b4535776ada90c4f9d0519572e

      • C:\Users\Admin\AppData\Roaming\PopDebug.htm

        Filesize

        1B

        MD5

        d1457b72c3fb323a2671125aef3eab5d

        SHA1

        5bab61eb53176449e25c2c82f172b82cb13ffb9d

        SHA256

        8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

        SHA512

        ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

      • memory/2096-0-0x000007FEF5FD3000-0x000007FEF5FD4000-memory.dmp

        Filesize

        4KB

      • memory/2096-1-0x0000000000F60000-0x0000000000FB2000-memory.dmp

        Filesize

        328KB

      • memory/2300-7-0x0000000000330000-0x0000000000382000-memory.dmp

        Filesize

        328KB

      • memory/2300-9-0x000007FEF5FD0000-0x000007FEF69BC000-memory.dmp

        Filesize

        9.9MB

      • memory/2300-77-0x000007FEF5FD0000-0x000007FEF69BC000-memory.dmp

        Filesize

        9.9MB

      • memory/2300-1069-0x000007FEF5FD0000-0x000007FEF69BC000-memory.dmp

        Filesize

        9.9MB