Analysis

  • max time kernel
    69s
  • max time network
    115s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    30-11-2022 18:42

General

  • Target

    4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe

  • Size

    648KB

  • MD5

    763dd9b7f2a5183a1380bee36889f936

  • SHA1

    cdc7f9911a853973fc83d0e1a51ee5e82da347c9

  • SHA256

    4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

  • SHA512

    7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

  • SSDEEP

    12288:Z8iNlD5ZS/1WEJOAqRSEM3Sy21LVbK89elrrJ56:vKIDAEQSy2TbKuKN

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 6 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 6 IoCs
  • VenomRAT

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

  • Executes dropped EXE 6 IoCs
  • Loads dropped DLL 2 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 2 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 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Creates scheduled task(s) 1 TTPs 1 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 18 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 53 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
    "C:\Users\Admin\AppData\Local\Temp\4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:1380
    • C:\Users\Admin\AppData\Local\Temp\4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
      "C:\Users\Admin\AppData\Local\Temp\4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe"
      2⤵
      • Modifies Windows Defender Real-time Protection settings
      • 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:1744
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:1768
      • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
        "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:292
        • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
          4⤵
          • Executes dropped EXE
          PID:2044
        • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
          4⤵
          • Executes dropped EXE
          PID:1068
        • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
          4⤵
          • Executes dropped EXE
          PID:1288
        • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
          4⤵
          • Executes dropped EXE
          PID:1788
        • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
          4⤵
          • Executes dropped EXE
          PID:2020
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "powershell" Get-MpPreference -verbose
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1872
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1600
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
          4⤵
            PID:1824
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1744 -s 1976
          3⤵
          • Program crash
          PID:1620

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\8nZo2TEUooVe.bat

      Filesize

      261B

      MD5

      87b94ee26957f101f227442746bcb477

      SHA1

      b33b92cb6c12e6469359f06a216dfdb8f65dafb3

      SHA256

      a73f50a37f560192356cb6910ba3c57a53ed91f10b703b5a9eb267504e8ce1e9

      SHA512

      10f47882c3b291d0229b975bd378df0be3b736d4f93d61cbb12f813252c4cd96d6fec781452ab86c31a3f15098e5fbfddc04cfa908d31131b90d875f31ae53a2

    • 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

    • 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\Roaming\SubDir\Windows Defender Security.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/292-75-0x00000000003D0000-0x0000000000478000-memory.dmp

      Filesize

      672KB

    • memory/292-71-0x0000000000000000-mapping.dmp

    • memory/1380-55-0x00000000764C1000-0x00000000764C3000-memory.dmp

      Filesize

      8KB

    • memory/1380-54-0x00000000013C0000-0x0000000001468000-memory.dmp

      Filesize

      672KB

    • memory/1380-56-0x0000000000430000-0x000000000043A000-memory.dmp

      Filesize

      40KB

    • memory/1600-85-0x0000000000000000-mapping.dmp

    • memory/1620-88-0x0000000000000000-mapping.dmp

    • memory/1744-61-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1744-57-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1744-58-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1744-67-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1744-63-0x0000000000486C4E-mapping.dmp

    • memory/1744-62-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1744-60-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1744-65-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1768-69-0x0000000000000000-mapping.dmp

    • memory/1824-86-0x0000000000000000-mapping.dmp

    • memory/1872-74-0x0000000000000000-mapping.dmp

    • memory/1872-84-0x000000006F070000-0x000000006F61B000-memory.dmp

      Filesize

      5.7MB

    • memory/1872-83-0x000000006F070000-0x000000006F61B000-memory.dmp

      Filesize

      5.7MB