Analysis

  • max time kernel
    121s
  • max time network
    121s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    07-11-2024 09:37

General

  • Target

    2024-11-07_bcf9a3f92706b2cb338459dd52488472_wannacry.exe

  • Size

    352KB

  • MD5

    bcf9a3f92706b2cb338459dd52488472

  • SHA1

    5e31b8509abc813d474577c6785e961ced7cc697

  • SHA256

    1229e2bf183c624411a3ee4efb10a27a500593b36c9f2643d1c2222479cea83d

  • SHA512

    53b4c972c21a18551af1a2803855d73acf344e566b5bf85a88b985c00a4cd5e00cf1bfe0dcafe25fcfe2c0616dc0473a45cfd9918cedea0d4c87a988ed5bdb23

  • SSDEEP

    6144:lQsq9wlNPowTMHRSsfcUN1x/Vy21WW/R3mj8YR9em2fG9p:lQMl6wTMHR51WsR2j8YRwm2fyp

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.

  • 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 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 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 5 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\2024-11-07_bcf9a3f92706b2cb338459dd52488472_wannacry.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-11-07_bcf9a3f92706b2cb338459dd52488472_wannacry.exe"
    1⤵
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2868
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.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:1728
      • 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:2052
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:1752
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2808
      • 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:2720
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2620
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2692
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2540
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:2488
      • 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:1668
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1672
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2928
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:2240
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
        PID:572

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        197B

        MD5

        70634f949389b56592495eb94140321e

        SHA1

        987005519604566d268f399319b7f062967f4a24

        SHA256

        cb5fb63c0ac4f248d0dc63d8ea65d9ae0988be7b769a1072b3ce11303a43099a

        SHA512

        025d0b4fe43ce34939c1422df1bc9883b128696e653d4903b6a2028821a01003aa4cc00b922cfd3513b68415e57397a3cee1ca9bc0638095a32dccabfbb297d2

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

        Filesize

        352KB

        MD5

        bcf9a3f92706b2cb338459dd52488472

        SHA1

        5e31b8509abc813d474577c6785e961ced7cc697

        SHA256

        1229e2bf183c624411a3ee4efb10a27a500593b36c9f2643d1c2222479cea83d

        SHA512

        53b4c972c21a18551af1a2803855d73acf344e566b5bf85a88b985c00a4cd5e00cf1bfe0dcafe25fcfe2c0616dc0473a45cfd9918cedea0d4c87a988ed5bdb23

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

        Filesize

        1B

        MD5

        d1457b72c3fb323a2671125aef3eab5d

        SHA1

        5bab61eb53176449e25c2c82f172b82cb13ffb9d

        SHA256

        8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

        SHA512

        ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

      • memory/1728-10-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

        Filesize

        9.9MB

      • memory/1728-8-0x0000000000020000-0x000000000007E000-memory.dmp

        Filesize

        376KB

      • memory/1728-947-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

        Filesize

        9.9MB

      • memory/2868-0-0x000007FEF56D3000-0x000007FEF56D4000-memory.dmp

        Filesize

        4KB

      • memory/2868-1-0x0000000000F50000-0x0000000000FAE000-memory.dmp

        Filesize

        376KB

      • memory/2868-2-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

        Filesize

        9.9MB

      • memory/2868-9-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

        Filesize

        9.9MB