Analysis

  • max time kernel
    477s
  • max time network
    591s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/09/2023, 23:38

General

  • Target

    902b16b11fc262b96d921f00f96bc83b0a302dc02829e14b17a8227e0e49d3c5.exe

  • Size

    55KB

  • MD5

    04fe14d0256c71c7ef0173c1bac2d407

  • SHA1

    b4972cbff4112fa1623e1921bb85dec39f923d2b

  • SHA256

    902b16b11fc262b96d921f00f96bc83b0a302dc02829e14b17a8227e0e49d3c5

  • SHA512

    166ab82d5c16f100405730a212ef4b7ebd21d4e5ac753f205e67c53068a35f3f2a28475d1e805c02f42c32425b8c53910b8d5b585dc3efe2e4536a7603c03a84

  • SSDEEP

    1536:eo2mQ1r9WekrJqzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzs:eolQ1r9WF9hF

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 4 IoCs
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Renames multiple (88) 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.

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Drops startup file 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
  • 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 2 TTPs 1 IoCs

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

  • Modifies registry class 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 49 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.

  • 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\902b16b11fc262b96d921f00f96bc83b0a302dc02829e14b17a8227e0e49d3c5.exe
    "C:\Users\Admin\AppData\Local\Temp\902b16b11fc262b96d921f00f96bc83b0a302dc02829e14b17a8227e0e49d3c5.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4236
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Checks computer location settings
      • Drops startup file
      • Executes dropped EXE
      • Sets desktop wallpaper using registry
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3348
      • 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:3504
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:4008
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:3464
      • 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:4492
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4720
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4544
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3932
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:2752
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\NIGHT_CROW_RECOVERY.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:1716
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4572
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4736
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:4600
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:4744

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Roaming\NIGHT_CROW_RECOVERY.txt

            Filesize

            603B

            MD5

            641c3eaed2ac13a0ec65a2d3754da95f

            SHA1

            30ff5e7c82530a2c07517e2fd1d93425fed23f8d

            SHA256

            9e9c33a98c4fd44dfa3ab8ae450e22fc059d960ae5920894bba7ffd9bf41f445

            SHA512

            13ff44284e85ccf99adcd0923282f7c0d7fe3bb298072242c00a688304560e09be720de0e6ddbbe6966b94022afd85362757e9678e51eddb71dd3184e0bcc5f9

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

            Filesize

            55KB

            MD5

            04fe14d0256c71c7ef0173c1bac2d407

            SHA1

            b4972cbff4112fa1623e1921bb85dec39f923d2b

            SHA256

            902b16b11fc262b96d921f00f96bc83b0a302dc02829e14b17a8227e0e49d3c5

            SHA512

            166ab82d5c16f100405730a212ef4b7ebd21d4e5ac753f205e67c53068a35f3f2a28475d1e805c02f42c32425b8c53910b8d5b585dc3efe2e4536a7603c03a84

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

            Filesize

            55KB

            MD5

            04fe14d0256c71c7ef0173c1bac2d407

            SHA1

            b4972cbff4112fa1623e1921bb85dec39f923d2b

            SHA256

            902b16b11fc262b96d921f00f96bc83b0a302dc02829e14b17a8227e0e49d3c5

            SHA512

            166ab82d5c16f100405730a212ef4b7ebd21d4e5ac753f205e67c53068a35f3f2a28475d1e805c02f42c32425b8c53910b8d5b585dc3efe2e4536a7603c03a84

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

            Filesize

            55KB

            MD5

            04fe14d0256c71c7ef0173c1bac2d407

            SHA1

            b4972cbff4112fa1623e1921bb85dec39f923d2b

            SHA256

            902b16b11fc262b96d921f00f96bc83b0a302dc02829e14b17a8227e0e49d3c5

            SHA512

            166ab82d5c16f100405730a212ef4b7ebd21d4e5ac753f205e67c53068a35f3f2a28475d1e805c02f42c32425b8c53910b8d5b585dc3efe2e4536a7603c03a84

          • C:\Users\Admin\Music\NIGHT_CROW_RECOVERY.txt

            Filesize

            603B

            MD5

            641c3eaed2ac13a0ec65a2d3754da95f

            SHA1

            30ff5e7c82530a2c07517e2fd1d93425fed23f8d

            SHA256

            9e9c33a98c4fd44dfa3ab8ae450e22fc059d960ae5920894bba7ffd9bf41f445

            SHA512

            13ff44284e85ccf99adcd0923282f7c0d7fe3bb298072242c00a688304560e09be720de0e6ddbbe6966b94022afd85362757e9678e51eddb71dd3184e0bcc5f9

          • memory/3348-15-0x00007FFA2D240000-0x00007FFA2DD01000-memory.dmp

            Filesize

            10.8MB

          • memory/3348-203-0x00007FFA2D240000-0x00007FFA2DD01000-memory.dmp

            Filesize

            10.8MB

          • memory/4236-0-0x0000000000D00000-0x0000000000D14000-memory.dmp

            Filesize

            80KB

          • memory/4236-1-0x00007FFA2D240000-0x00007FFA2DD01000-memory.dmp

            Filesize

            10.8MB

          • memory/4236-14-0x00007FFA2D240000-0x00007FFA2DD01000-memory.dmp

            Filesize

            10.8MB