Overview

overview

10

Static

static

10

crynox.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    41s
  • max time network
    43s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    14-12-2024 14:23

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General

  • Target

    crynox.exe

  • Size

    599KB

  • MD5

    f9f3379858516f1ec7c3474dba4cfe13

  • SHA1

    2365e729155dad22856e09275cb94369889d4f14

  • SHA256

    d36c18499800859f77d6c2462a99b6e5e5e066fff95418dce4d5fdb8d45d0106

  • SHA512

    4fcab92050504619a581043023dcbc106a816d1fe134c5f351478295281d08bfc50ab4a77e7c59210aa2bf4b704ffee6b0c27f4d3153703087b86d5a633b2b5b

  • SSDEEP

    12288:1Iw6EkPJU2XGyVdEcIf/vbIGSA4Jxv+T:8SJyIP8

Score
10/10
chaosdefense_evasionevasionexecutionimpactransomwarespywarestealer

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Adobe\Acrobat\DC\read_it.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 should 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/index.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/index.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 (181) 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
  • 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 39 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⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3272
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • 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:4508
      • 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:1372
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2928
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:416
      • 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:1448
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:3396
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4100
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2060
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:4640
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:1412
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2308
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:3800
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:5056
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:4036

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Adobe\Acrobat\DC\read_it.txt
      Filesize

      1KB

      MD5

      a55f796e9445ce36622c596f1b112ae6

      SHA1

      ceaa93ef5fc6447afa0c082ac90defc821d345fd

      SHA256

      16b656de9ae1111a9f4b73f28296a3c06a5fbc7477bb3a48b0b9383d49b0a736

      SHA512

      831ecb7aa8d454a34bfe47ffa460d623c1364c6007fe55b3e4bc6cfb482f3688ce76ad1fb5ad952049084e703da17fec3118b70cdf666f7cd6cb745dea68ba10

      Download Submit

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

      226B

      MD5

      4ae344179932dc8e2c6fe2079f9753ef

      SHA1

      60eacc624412b1f34809780769e3b212f138ea9c

      SHA256

      3063de3898a9b34e19f8cf0beeec2b8bd6bd05896b52abd73f4703d07b8a7cd4

      SHA512

      fadfe2b83f1af8fdc50430325f69d6172d2c1e889ca3800b3b83e5535d5970c32e9a176b48563275a0630d56c96d9f88df148fd6b2d281f0fc58129e5f4dba19

      Download Submit

    • C:\Users\Admin\AppData\Roaming\InstallCheckpoint.xla
      Filesize

      1B

      MD5

      d1457b72c3fb323a2671125aef3eab5d

      SHA1

      5bab61eb53176449e25c2c82f172b82cb13ffb9d

      SHA256

      8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

      SHA512

      ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

      Download Submit

    • C:\Users\Admin\AppData\Roaming\svchost.exe
      Filesize

      599KB

      MD5

      f9f3379858516f1ec7c3474dba4cfe13

      SHA1

      2365e729155dad22856e09275cb94369889d4f14

      SHA256

      d36c18499800859f77d6c2462a99b6e5e5e066fff95418dce4d5fdb8d45d0106

      SHA512

      4fcab92050504619a581043023dcbc106a816d1fe134c5f351478295281d08bfc50ab4a77e7c59210aa2bf4b704ffee6b0c27f4d3153703087b86d5a633b2b5b

      Download Submit

    • memory/3272-1-0x0000000000BC0000-0x0000000000C5A000-memory.dmp

      Filesize

      616KB

      Download

    • memory/3272-0-0x00007FFC85053000-0x00007FFC85055000-memory.dmp

      Filesize

      8KB

      Download

    • memory/4508-14-0x00007FFC85050000-0x00007FFC85B12000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/4508-1185-0x00007FFC85050000-0x00007FFC85B12000-memory.dmp

      Filesize

      10.8MB

      Download