Resubmissions

03-08-2024 04:17

240803-ewn3sashrn 10

02-08-2024 06:52

240802-hncxbssajp 10

Analysis

  • max time kernel
    94s
  • max time network
    97s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-08-2024 04:17

General

  • Target

    2024-08-02_86faf18098e56c8c610b960d684a21d8_wannacry.exe

  • Size

    238KB

  • MD5

    86faf18098e56c8c610b960d684a21d8

  • SHA1

    db0eb3968c11da86490b679e7daded59b6006310

  • SHA256

    4e758d011d1d615ebd05c6ffe441dedf5d371efb1dca1c624ec896f56de19979

  • SHA512

    8c87c1847edeb56fc46d0e1adcf3bb8cc024d63fa9d2d49dd7bda68efb1c5fe473f001250408accccb86915cc5f077a46a28189b073cdd557d9042e48c7f4a9b

  • SSDEEP

    3072:K6Mq98ySh8of8yx/se2nz2j0XdNkgVjdLyWNgXc0IohbnivKUbUtHO9sO3LccckL:K6Mq9e2q+nRfkg7Scy4KUQHO9h3LN

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 2 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
  • Renames multiple (158) 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.

  • Disables Task Manager via registry modification
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Drops startup file 2 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.

  • 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).

  • Checks SCSI registry key(s) 3 TTPs 4 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Interacts with shadow copies 3 TTPs 1 IoCs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 42 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\2024-08-02_86faf18098e56c8c610b960d684a21d8_wannacry.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-08-02_86faf18098e56c8c610b960d684a21d8_wannacry.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3160
    • 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
      • Adds Run key to start application
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:468
      • 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:2040
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2572
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:3100
      • 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:1100
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4508
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4896
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1884
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:532
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\Womp-Womp.txt
        3⤵
          PID:2832
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2976
    • C:\Windows\system32\wbengine.exe
      "C:\Windows\system32\wbengine.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1784
    • C:\Windows\System32\vdsldr.exe
      C:\Windows\System32\vdsldr.exe -Embedding
      1⤵
        PID:4852
      • C:\Windows\System32\vds.exe
        C:\Windows\System32\vds.exe
        1⤵
        • Checks SCSI registry key(s)
        PID:1088

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\3D Objects\Womp-Womp.txt

        Filesize

        17B

        MD5

        1aae33bf814be3680af0c9e9d3f6bf06

        SHA1

        17cb8561c9d25c03eebd8691cd19f90b50916662

        SHA256

        6cab9d341be7e586c79eb547831906554eb6c12662a680e0992ed181a0ba691c

        SHA512

        a28b1ac387afa4c6c5c76c3e510e7de58d426b12dd06d5efe3348214842a7da5621cf8a1bac93f609b140ed4c4c524784886f027c254c65525478219f699661d

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\2024-08-02_86faf18098e56c8c610b960d684a21d8_wannacry.exe.log

        Filesize

        1KB

        MD5

        baf55b95da4a601229647f25dad12878

        SHA1

        abc16954ebfd213733c4493fc1910164d825cac8

        SHA256

        ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

        SHA512

        24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

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

        Filesize

        238KB

        MD5

        86faf18098e56c8c610b960d684a21d8

        SHA1

        db0eb3968c11da86490b679e7daded59b6006310

        SHA256

        4e758d011d1d615ebd05c6ffe441dedf5d371efb1dca1c624ec896f56de19979

        SHA512

        8c87c1847edeb56fc46d0e1adcf3bb8cc024d63fa9d2d49dd7bda68efb1c5fe473f001250408accccb86915cc5f077a46a28189b073cdd557d9042e48c7f4a9b

      • C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\Magnify.lnk

        Filesize

        1B

        MD5

        d1457b72c3fb323a2671125aef3eab5d

        SHA1

        5bab61eb53176449e25c2c82f172b82cb13ffb9d

        SHA256

        8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

        SHA512

        ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

      • memory/468-16-0x00007FFD7E1B0000-0x00007FFD7EC71000-memory.dmp

        Filesize

        10.8MB

      • memory/468-1100-0x00007FFD7E1B0000-0x00007FFD7EC71000-memory.dmp

        Filesize

        10.8MB

      • memory/3160-0-0x0000000000BF0000-0x0000000000C32000-memory.dmp

        Filesize

        264KB

      • memory/3160-1-0x00007FFD7E1B3000-0x00007FFD7E1B5000-memory.dmp

        Filesize

        8KB

      • memory/3160-2-0x00007FFD7E1B0000-0x00007FFD7EC71000-memory.dmp

        Filesize

        10.8MB

      • memory/3160-15-0x00007FFD7E1B0000-0x00007FFD7EC71000-memory.dmp

        Filesize

        10.8MB