Analysis

  • max time kernel
    61s
  • max time network
    128s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230221-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230221-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28-03-2023 05:29

General

  • Target

    0bb2957b2b8ed0a1c458da6edeaf5a48b2c1ecdd7d7ed33d00749ef1f5653b1e.exe

  • Size

    88KB

  • MD5

    bcf73d0b807d66634d7d25f399fa8ffe

  • SHA1

    3db3790b46e2d430374f6c40e7ce25e633696b75

  • SHA256

    0bb2957b2b8ed0a1c458da6edeaf5a48b2c1ecdd7d7ed33d00749ef1f5653b1e

  • SHA512

    0750fe4212f1bc7a16a426f6c363797e926656f7f27cc2bc5d5f624a436b3a075263ca29fa609696d7ef2d18b79ef7da4998c75a36c9bda2bd2beb456ae08f31

  • SSDEEP

    768:Hqo2MgNp4wBAQr9uNev2SU2Ip4jBqltCF0AxEjenoB69+Fx:Ko2g0AQr9usv2SFHBWAxEjc+

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
  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

  • Modifies extensions of user files 2 IoCs

    Ransomware generally changes the extension on encrypted files.

  • 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 2 TTPs

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

  • Drops desktop.ini file(s) 33 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • 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\0bb2957b2b8ed0a1c458da6edeaf5a48b2c1ecdd7d7ed33d00749ef1f5653b1e.exe
    "C:\Users\Admin\AppData\Local\Temp\0bb2957b2b8ed0a1c458da6edeaf5a48b2c1ecdd7d7ed33d00749ef1f5653b1e.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:868
    • C:\Users\Admin\AppData\Roaming\AdobeReader.exe
      "C:\Users\Admin\AppData\Roaming\AdobeReader.exe"
      2⤵
      • Modifies extensions of user files
      • Checks computer location settings
      • Drops startup file
      • Executes dropped EXE
      • Drops desktop.ini file(s)
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4860
      • 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:5112
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:3904
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2448
      • 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:2912
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2568
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:3868
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4116
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:4120
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\readme.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:4968
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1424
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:3568
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:388
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:2708

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Execution

    Command-Line Interface

    1
    T1059

    Defense Evasion

    File Deletion

    3
    T1107

    Credential Access

    Credentials in Files

    1
    T1081

    Discovery

    Query Registry

    3
    T1012

    System Information Discovery

    3
    T1082

    Peripheral Device Discovery

    1
    T1120

    Collection

    Data from Local System

    1
    T1005

    Impact

    Inhibit System Recovery

    4
    T1490

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      88KB

      MD5

      bcf73d0b807d66634d7d25f399fa8ffe

      SHA1

      3db3790b46e2d430374f6c40e7ce25e633696b75

      SHA256

      0bb2957b2b8ed0a1c458da6edeaf5a48b2c1ecdd7d7ed33d00749ef1f5653b1e

      SHA512

      0750fe4212f1bc7a16a426f6c363797e926656f7f27cc2bc5d5f624a436b3a075263ca29fa609696d7ef2d18b79ef7da4998c75a36c9bda2bd2beb456ae08f31

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

      88KB

      MD5

      bcf73d0b807d66634d7d25f399fa8ffe

      SHA1

      3db3790b46e2d430374f6c40e7ce25e633696b75

      SHA256

      0bb2957b2b8ed0a1c458da6edeaf5a48b2c1ecdd7d7ed33d00749ef1f5653b1e

      SHA512

      0750fe4212f1bc7a16a426f6c363797e926656f7f27cc2bc5d5f624a436b3a075263ca29fa609696d7ef2d18b79ef7da4998c75a36c9bda2bd2beb456ae08f31

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

      88KB

      MD5

      bcf73d0b807d66634d7d25f399fa8ffe

      SHA1

      3db3790b46e2d430374f6c40e7ce25e633696b75

      SHA256

      0bb2957b2b8ed0a1c458da6edeaf5a48b2c1ecdd7d7ed33d00749ef1f5653b1e

      SHA512

      0750fe4212f1bc7a16a426f6c363797e926656f7f27cc2bc5d5f624a436b3a075263ca29fa609696d7ef2d18b79ef7da4998c75a36c9bda2bd2beb456ae08f31

    • C:\Users\Admin\AppData\Roaming\readme.txt
      Filesize

      379B

      MD5

      2229cf5789dde916f76e2fcc1feb0a79

      SHA1

      43414adea3f0b537aae4ac0f884678b8a7fe21fb

      SHA256

      eccddbff564c04173b6704b3c3cdc3cd2cb166acbd97e8d18dd39286d9460760

      SHA512

      48ae3dfe5f5061c109ac281f21f5c4526e212421b5df516937eabc7780ffef2c8f6aa58a93af8a069603a37d20e0c1852f2c9776ed2d34701720455546befde1

    • C:\Users\Admin\Documents\OneNote Notebooks\My Notebook\readme.txt
      Filesize

      379B

      MD5

      2229cf5789dde916f76e2fcc1feb0a79

      SHA1

      43414adea3f0b537aae4ac0f884678b8a7fe21fb

      SHA256

      eccddbff564c04173b6704b3c3cdc3cd2cb166acbd97e8d18dd39286d9460760

      SHA512

      48ae3dfe5f5061c109ac281f21f5c4526e212421b5df516937eabc7780ffef2c8f6aa58a93af8a069603a37d20e0c1852f2c9776ed2d34701720455546befde1

    • memory/868-133-0x0000000000CE0000-0x0000000000CFC000-memory.dmp
      Filesize

      112KB

    • memory/4860-213-0x000000001D1E0000-0x000000001D1F0000-memory.dmp
      Filesize

      64KB

    • memory/4860-565-0x000000001D1E0000-0x000000001D1F0000-memory.dmp
      Filesize

      64KB