Analysis

  • max time kernel
    118s
  • max time network
    119s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    23-10-2024 07:25

General

  • Target

    aaaa/enc.exe

  • Size

    779KB

  • MD5

    646a228c774409c285c256a8faa49bde

  • SHA1

    e8fd96815fa181b40e3b1597b817c9905df9da59

  • SHA256

    35f7fa926804c2a9a49b25d6709de2d018bc32333df2e51471a69c55cbf072a0

  • SHA512

    7f73a607602e06d8f3126a5fad88c0c7cc8ff58fed28e7840ca47ecf50f575c8d8b751441b4c7ac7aa48e65226c1219c7afa543db9f553bef1173330a3f64c13

  • SSDEEP

    12288:bCyAGey4UN8Pn55NRi9Q2i8xLmLCNWyReZsk0Clrbk68zn2fVCBLhjuxWhn8+klX:juy0cXzVRnjfioO5mX/

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 3 IoCs
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

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

    Uses wbadmin.exe to inhibit system recovery.

  • Disables Task Manager via registry modification
  • Drops startup file 2 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.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Drops desktop.ini file(s) 64 IoCs
  • Sets desktop wallpaper using registry 2 TTPs 2 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 6 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\aaaa\enc.exe
    "C:\Users\Admin\AppData\Local\Temp\aaaa\enc.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2956
    • C:\Users\Admin\AppData\Roaming\twelve.exe
      "C:\Users\Admin\AppData\Roaming\twelve.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • 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:2752
      • 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:2576
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2844
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2856
      • 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:2136
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1660
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1400
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:700
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:1296
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\Twelve.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:1424
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2720
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1932
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:2460
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
        PID:1264

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\ProgramData\Adobe\Updater6\Twelve.txt

        Filesize

        38B

        MD5

        7afeb3bf9a9a994a6444958adf75bfff

        SHA1

        4fdf7442d158a752a174054ec8fa73c149968f17

        SHA256

        d69ff81bffe7a3f4d8e5374ffea18a5b22856dd85459ddfcd047b82943201f11

        SHA512

        1c3edca1046a167dcb33797375cfeab2b66985630e85e6cb14862c70aae3a0d8c067c94d1de772d46226ea391b8ca5b434951eba5cb50f6c92afddc5c051bdb0

      • C:\Users\Admin\AppData\Roaming\twelve.exe

        Filesize

        779KB

        MD5

        646a228c774409c285c256a8faa49bde

        SHA1

        e8fd96815fa181b40e3b1597b817c9905df9da59

        SHA256

        35f7fa926804c2a9a49b25d6709de2d018bc32333df2e51471a69c55cbf072a0

        SHA512

        7f73a607602e06d8f3126a5fad88c0c7cc8ff58fed28e7840ca47ecf50f575c8d8b751441b4c7ac7aa48e65226c1219c7afa543db9f553bef1173330a3f64c13

      • C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Notepad.lnk

        Filesize

        1B

        MD5

        d1457b72c3fb323a2671125aef3eab5d

        SHA1

        5bab61eb53176449e25c2c82f172b82cb13ffb9d

        SHA256

        8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

        SHA512

        ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

      • memory/2752-8-0x0000000000150000-0x000000000021A000-memory.dmp

        Filesize

        808KB

      • memory/2752-9-0x000007FEF5630000-0x000007FEF601C000-memory.dmp

        Filesize

        9.9MB

      • memory/2752-10-0x000007FEF5630000-0x000007FEF601C000-memory.dmp

        Filesize

        9.9MB

      • memory/2752-958-0x000007FEF5630000-0x000007FEF601C000-memory.dmp

        Filesize

        9.9MB

      • memory/2956-0-0x000007FEF5633000-0x000007FEF5634000-memory.dmp

        Filesize

        4KB

      • memory/2956-1-0x00000000013B0000-0x000000000147A000-memory.dmp

        Filesize

        808KB

      • memory/2956-3-0x000007FEF5630000-0x000007FEF601C000-memory.dmp

        Filesize

        9.9MB

      • memory/2956-11-0x000007FEF5630000-0x000007FEF601C000-memory.dmp

        Filesize

        9.9MB