Analysis

  • max time kernel
    130s
  • max time network
    145s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    30-11-2022 14:28

General

  • Target

    94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33.exe

  • Size

    680KB

  • MD5

    4f99850bfde0c6703b4f2c8420b9dc8f

  • SHA1

    c60d92f1e0529b2e770858e180906bf9fae631a9

  • SHA256

    94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33

  • SHA512

    0d311592bc2dc5ececb3afae6dee5842b9f6a37710d29f5f1a3fe8a27d3e43a625a57039bef92044744d8a0225c52260cc9757b148deb9e0c4e72781e1a89aec

  • SSDEEP

    12288:75393whFOBbQVXQsI6f9fqAPzzEeEZchCBywRiaxJDj8DkIonQmP0Ove/diuHc:753uhF7VAibzzEe9wRiaLSkI8QhOQ18

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

ajith

C2

23.105.131.178:7812

Mutex

VNM_MUTEX_NdVd2sPSSqFdo7I35g

Attributes
  • encryption_key

    jyerms3KOWmt3C9DBFuq

  • install_name

    Windows Defender Security.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update

  • subdirectory

    SubDir

Signatures

  • Contains code to disable Windows Defender 7 IoCs

    A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

  • Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 7 IoCs
  • VenomRAT

    VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.

  • Executes dropped EXE 5 IoCs
  • Deletes itself 1 IoCs
  • Loads dropped DLL 3 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 3 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 58 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33.exe
    "C:\Users\Admin\AppData\Local\Temp\94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1092
    • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
      "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:664
      • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
        "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"
        3⤵
        • Modifies Windows Defender Real-time Protection settings
        • Executes dropped EXE
        • Loads dropped DLL
        • Windows security modification
        • Adds Run key to start application
        • Modifies system certificate store
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:936
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe" /rl HIGHEST /f
          4⤵
          • Creates scheduled task(s)
          PID:1564
        • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1116
          • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
            "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
            5⤵
            • Executes dropped EXE
            PID:2004
          • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
            "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
            5⤵
            • Executes dropped EXE
            • Adds Run key to start application
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:1956
            • C:\Windows\SysWOW64\schtasks.exe
              "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe" /rl HIGHEST /f
              6⤵
              • Creates scheduled task(s)
              PID:1252
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "powershell" Get-MpPreference -verbose
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2020
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:944
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
            5⤵
            • Deletes itself
            PID:1160
        • C:\Windows\SysWOW64\cmd.exe
          cmd /c ""C:\Users\Admin\AppData\Local\Temp\vddUngunQ1Xs.bat" "
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1340
          • C:\Windows\SysWOW64\chcp.com
            chcp 65001
            5⤵
              PID:2044

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe

      Filesize

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe

      Filesize

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe

      Filesize

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • C:\Users\Admin\AppData\Local\Temp\vddUngunQ1Xs.bat

      Filesize

      239B

      MD5

      91454e4f299038e55a35479a8346b91d

      SHA1

      be4bc923e3157408ad2e9dc773fbdbedf55835e8

      SHA256

      176aeb0ad066144c2feff1a137230b459557832637289ed1b69af7d86d25fcc6

      SHA512

      ab3772beec68de30b2bf01575516a0f0c3848cd4b42d78e42d3ca022675c99e513a5e1a5b3bac8addf78abafb1df4a35a8b7dbffcff5a6365d9629146dbf9f9f

    • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe

      Filesize

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe

      Filesize

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe

      Filesize

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe

      Filesize

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • \Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe

      Filesize

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • \Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe

      Filesize

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • \Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe

      Filesize

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • memory/664-61-0x0000000000240000-0x000000000024A000-memory.dmp

      Filesize

      40KB

    • memory/664-59-0x0000000000280000-0x0000000000328000-memory.dmp

      Filesize

      672KB

    • memory/664-56-0x0000000000000000-mapping.dmp

    • memory/936-63-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/936-66-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/936-72-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/936-69-0x0000000000486C4E-mapping.dmp

    • memory/936-68-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/936-74-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/936-67-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/936-64-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/944-101-0x0000000000000000-mapping.dmp

    • memory/1092-54-0x0000000074C91000-0x0000000074C93000-memory.dmp

      Filesize

      8KB

    • memory/1116-78-0x0000000000000000-mapping.dmp

    • memory/1116-81-0x0000000000310000-0x00000000003B8000-memory.dmp

      Filesize

      672KB

    • memory/1160-102-0x0000000000000000-mapping.dmp

    • memory/1252-98-0x0000000000000000-mapping.dmp

    • memory/1340-103-0x0000000000000000-mapping.dmp

    • memory/1564-76-0x0000000000000000-mapping.dmp

    • memory/1956-91-0x0000000000486C4E-mapping.dmp

    • memory/2020-82-0x0000000000000000-mapping.dmp

    • memory/2020-99-0x000000006E8B0000-0x000000006EE5B000-memory.dmp

      Filesize

      5.7MB

    • memory/2020-100-0x000000006E8B0000-0x000000006EE5B000-memory.dmp

      Filesize

      5.7MB

    • memory/2044-105-0x0000000000000000-mapping.dmp