Analysis

  • max time kernel
    118s
  • max time network
    119s
  • platform
    windows7_x64
  • resource
    win7-20241023-en
  • resource tags

    arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
  • submitted
    19-11-2024 02:55

General

  • Target

    TestServer.exe

  • Size

    107KB

  • MD5

    c133ce6541688d84cfb35186fa8ad88f

  • SHA1

    67d7c34ce8548ffcd1ec4f8608beba7a06b1fb0b

  • SHA256

    9b74a10d6efbf33d56285505ae702947ea333447bfc583537f14018569b62ea6

  • SHA512

    81efaf9f3b580ec37d5237663cca2f0ef8d9683304ee9a679da6be2c30961adad8c7bb38b64b0f1fbd4163667927871e912e0b669de2796cb14c370ea5707d50

  • SSDEEP

    384:N3Mg/bqo2W4fSpJpMDKw/+988Jrr91CvpQHACQIdQepRsva46eLrTH+33M3zJ1oL:3qo2apMDN/NUrr9Ip5epij

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 3 IoCs
  • Chaos family
  • 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.

  • 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.

  • Drops desktop.ini file(s) 34 IoCs
  • Sets desktop wallpaper using registry 2 TTPs 1 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 7 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\TestServer.exe
    "C:\Users\Admin\AppData\Local\Temp\TestServer.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2312
    • 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
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2848
      • 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:2724
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2972
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2236
      • 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:708
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1524
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1100
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:448
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\FORNATHAN.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:1736
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2084
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1852
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:2108
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
        PID:900

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        107KB

        MD5

        c133ce6541688d84cfb35186fa8ad88f

        SHA1

        67d7c34ce8548ffcd1ec4f8608beba7a06b1fb0b

        SHA256

        9b74a10d6efbf33d56285505ae702947ea333447bfc583537f14018569b62ea6

        SHA512

        81efaf9f3b580ec37d5237663cca2f0ef8d9683304ee9a679da6be2c30961adad8c7bb38b64b0f1fbd4163667927871e912e0b669de2796cb14c370ea5707d50

      • C:\Users\Admin\Documents\FORNATHAN.txt

        Filesize

        1KB

        MD5

        fe77eea33bfab77e62aa9c84307322d7

        SHA1

        a0ae02f0e7fef9da285a2ef350fb389309761171

        SHA256

        728c388adb493e26c58db0970a59573e7cb136e5463076324bd978d8b6bf0e2f

        SHA512

        9ced19eaaffdbae688137b2d26ef5de30e5310acb2dc1801607437154fad690aeed5c08971a1395495dc72175178ce7b18a5a73ab272ca1e34abd316091da295

      • memory/2312-0-0x000007FEF5E63000-0x000007FEF5E64000-memory.dmp

        Filesize

        4KB

      • memory/2312-1-0x0000000000930000-0x0000000000950000-memory.dmp

        Filesize

        128KB

      • memory/2312-2-0x000007FEF5E63000-0x000007FEF5E64000-memory.dmp

        Filesize

        4KB

      • memory/2848-8-0x00000000010B0000-0x00000000010D0000-memory.dmp

        Filesize

        128KB

      • memory/2848-16-0x000007FEF5E60000-0x000007FEF684C000-memory.dmp

        Filesize

        9.9MB

      • memory/2848-21-0x000007FEF5E60000-0x000007FEF684C000-memory.dmp

        Filesize

        9.9MB

      • memory/2848-462-0x000007FEF5E60000-0x000007FEF684C000-memory.dmp

        Filesize

        9.9MB

      • memory/2848-468-0x000007FEF5E60000-0x000007FEF684C000-memory.dmp

        Filesize

        9.9MB