Overview

overview

10

Static

static

10

crynox.exe

windows7-x64

10

crynox.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    94s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-12-2024 14:00

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General

  • Target

    crynox.exe

  • Size

    299KB

  • MD5

    e6e2f46331a60acfc399f10ff842345d

  • SHA1

    514945da2f3518753b22df05786e6dce446d7ec1

  • SHA256

    c50584f0f5cccb28d192fb2540077792732b8afe1eb887cc3657d60980d9ad02

  • SHA512

    08842cb745dc04c6a2f0233b69647502cdc2920c2f520415507b98d54b7086f15282ba177baf93c11fbd6415467f1fb84df5a05a8d1923f47737344b6843333c

  • SSDEEP

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

Score
10/10
chaosdefense_evasionevasionexecutionimpactransomwarespywarestealer

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\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.

    ransomwarechaos
  • Chaos Ransomware 2 IoCs
  • Chaos family
    chaos
  • 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
  • Renames multiple (169) files with added filename extension

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

    ransomware
  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

    ransomware
  • Disables Task Manager via registry modification
    evasion
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • 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.

    spywarestealer
  • 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 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 53 IoCs
  • Suspicious use of AdjustPrivilegeToken 50 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\crynox.exe
    "C:\Users\Admin\AppData\Local\Temp\crynox.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1912
    • C:\Users\Admin\AppData\Roaming\Antimalware Service Executables.exe
      "C:\Users\Admin\AppData\Roaming\Antimalware Service Executables.exe"
      2⤵
      • Checks computer location settings
      • Drops startup file
      • Executes dropped EXE
      • 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:3264
      • 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:2536
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:564
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:4448
      • 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:3996
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:660
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:3364
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4564
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:1212
      • 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:5016
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1200
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4500
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:4908
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:2864

    Network

    MITRE ATT&CK Enterprise v15

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    Downloads

    • C:\Users\Admin\AppData\Local\Decrypt_My_File.txt
      Filesize

      1KB

      MD5

      15f57e55659f5dabf91fb3cf52e57e2a

      SHA1

      aa65f8c50caae971f0d4dc1b1f0966fd24da80b1

      SHA256

      c1fb308357cca35f9982722bdd7c3a208cd8bb0568dd9ffba6fa4f2d98afc41c

      SHA512

      548435be6e6bcce47f9d2a54571ea541ac4864a27a4728c4684dd8acbf2ad5a69a55ac0e86e2292f72def6decf282c6765b630a25d98d64f728ef837e24fdb00

      Download Submit

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\crynox.exe.log
      Filesize

      226B

      MD5

      28d7fcc2b910da5e67ebb99451a5f598

      SHA1

      a5bf77a53eda1208f4f37d09d82da0b9915a6747

      SHA256

      2391511d0a66ed9f84ae54254f51c09e43be01ad685db80da3201ec880abd49c

      SHA512

      2d8eb65cbf04ca506f4ef3b9ae13ccf05ebefab702269ba70ffd1ce9e6c615db0a3ee3ac0e81a06f546fc3250b7b76155dd51241c41b507a441b658c8e761df6

      Download Submit

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

      299KB

      MD5

      e6e2f46331a60acfc399f10ff842345d

      SHA1

      514945da2f3518753b22df05786e6dce446d7ec1

      SHA256

      c50584f0f5cccb28d192fb2540077792732b8afe1eb887cc3657d60980d9ad02

      SHA512

      08842cb745dc04c6a2f0233b69647502cdc2920c2f520415507b98d54b7086f15282ba177baf93c11fbd6415467f1fb84df5a05a8d1923f47737344b6843333c

      Download Submit

    • C:\Users\Admin\AppData\Roaming\EnableDisconnect.ini
      Filesize

      1B

      MD5

      d1457b72c3fb323a2671125aef3eab5d

      SHA1

      5bab61eb53176449e25c2c82f172b82cb13ffb9d

      SHA256

      8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

      SHA512

      ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

      Download Submit

    • memory/1912-0-0x00007FFD82373000-0x00007FFD82375000-memory.dmp

      Filesize

      8KB

      Download

    • memory/1912-1-0x00000000007D0000-0x0000000000820000-memory.dmp

      Filesize

      320KB

      Download

    • memory/3264-14-0x00007FFD82370000-0x00007FFD82E31000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/3264-39-0x00007FFD82370000-0x00007FFD82E31000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/3264-1140-0x00007FFD82370000-0x00007FFD82E31000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/3264-1141-0x00007FFD82370000-0x00007FFD82E31000-memory.dmp

      Filesize

      10.8MB

      Download