Analysis

  • max time kernel
    155s
  • max time network
    175s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25-11-2022 09:06

General

  • Target

    4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20.exe

  • Size

    754KB

  • MD5

    7458e53900eacc8d1c0738a242bf3d8b

  • SHA1

    c7665e28afc4b44882916d4abf8acf17abf5ce59

  • SHA256

    4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20

  • SHA512

    7c8872c2769466762131464780e8982e8f9da652b2524bf13f0c7c8044f61ed54b0df1869ed1f62d6413c0b321176c327daa33d6a15144ab0e5b549c5fd93da2

  • SSDEEP

    12288:C9cxy4jZZ8vDc6h3iUhFbAsUMdzxP0V2t5fI44FPTZFyd4:C9cxy4jZ+vDc05hFXxxEIfhe7yd4

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

hacked

C2

23.105.131.178:7812

Mutex

VNM_MUTEX_0Ae9WwC7TPO9smz3BJ

Attributes
  • encryption_key

    jCEkwlvO5Scyan0S8vZo

  • install_name

    Windows Security Health Service.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update

  • subdirectory

    Microsoft

Signatures

  • Contains code to disable Windows Defender 1 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 1 IoCs
  • VenomRAT

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

  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • 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 2 IoCs

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

  • Suspicious use of SetThreadContext 3 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.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 54 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20.exe
    "C:\Users\Admin\AppData\Local\Temp\4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4520
    • C:\Users\Admin\AppData\Local\Temp\4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20.exe
      "C:\Users\Admin\AppData\Local\Temp\4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20.exe"
      2⤵
      • Modifies Windows Defender Real-time Protection settings
      • Checks computer location settings
      • Windows security modification
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4952
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:820
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows Security Health Service.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows Security Health Service.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1060
        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows Security Health Service.exe
          "C:\Users\Admin\AppData\Roaming\Microsoft\Windows Security Health Service.exe"
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:4884
          • C:\Windows\SysWOW64\schtasks.exe
            "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Windows Security Health Service.exe" /rl HIGHEST /f
            5⤵
            • Creates scheduled task(s)
            PID:3796
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "powershell" Get-MpPreference -verbose
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1028
      • 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:3868
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
          4⤵
            PID:3704
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\g4pzdjdt7Szp.bat" "
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:4900
          • C:\Windows\SysWOW64\chcp.com
            chcp 65001
            4⤵
              PID:3000
            • C:\Windows\SysWOW64\PING.EXE
              ping -n 10 localhost
              4⤵
              • Runs ping.exe
              PID:2820
            • C:\Users\Admin\AppData\Local\Temp\4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20.exe
              "C:\Users\Admin\AppData\Local\Temp\4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20.exe"
              4⤵
              • Suspicious use of SetThreadContext
              • Suspicious use of WriteProcessMemory
              PID:2516
              • C:\Users\Admin\AppData\Local\Temp\4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20.exe
                "C:\Users\Admin\AppData\Local\Temp\4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20.exe"
                5⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2532

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20.exe.log

        Filesize

        507B

        MD5

        8cf94b5356be60247d331660005941ec

        SHA1

        fdedb361f40f22cb6a086c808fc0056d4e421131

        SHA256

        52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

        SHA512

        b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

      • C:\Users\Admin\AppData\Local\Temp\g4pzdjdt7Szp.bat

        Filesize

        261B

        MD5

        ee8f3d9548344b677d6b22c80ae6e3a8

        SHA1

        3012278defdecd512f4de239c3e15d9cfbba2d4d

        SHA256

        259689fd5923d7f2ad5a65480c3e51d0593c610626700ae44c3b98665085f080

        SHA512

        476892affec6b7581831a682ef01e2beda894fb33c38d9397150af20f6e713c7f9b82135b59f413bc4972d7f59245d4a43ccf36c12a98224901e293d7139d770

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows Security Health Service.exe

        Filesize

        754KB

        MD5

        7458e53900eacc8d1c0738a242bf3d8b

        SHA1

        c7665e28afc4b44882916d4abf8acf17abf5ce59

        SHA256

        4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20

        SHA512

        7c8872c2769466762131464780e8982e8f9da652b2524bf13f0c7c8044f61ed54b0df1869ed1f62d6413c0b321176c327daa33d6a15144ab0e5b549c5fd93da2

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows Security Health Service.exe

        Filesize

        754KB

        MD5

        7458e53900eacc8d1c0738a242bf3d8b

        SHA1

        c7665e28afc4b44882916d4abf8acf17abf5ce59

        SHA256

        4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20

        SHA512

        7c8872c2769466762131464780e8982e8f9da652b2524bf13f0c7c8044f61ed54b0df1869ed1f62d6413c0b321176c327daa33d6a15144ab0e5b549c5fd93da2

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows Security Health Service.exe

        Filesize

        754KB

        MD5

        7458e53900eacc8d1c0738a242bf3d8b

        SHA1

        c7665e28afc4b44882916d4abf8acf17abf5ce59

        SHA256

        4113f5b8526a18afb979ae9d4649c7e01abdf2c311608be8cd131a301298ea20

        SHA512

        7c8872c2769466762131464780e8982e8f9da652b2524bf13f0c7c8044f61ed54b0df1869ed1f62d6413c0b321176c327daa33d6a15144ab0e5b549c5fd93da2

      • memory/820-141-0x0000000000000000-mapping.dmp

      • memory/1028-163-0x00000000073A0000-0x00000000073A8000-memory.dmp

        Filesize

        32KB

      • memory/1028-152-0x0000000004FE0000-0x0000000005046000-memory.dmp

        Filesize

        408KB

      • memory/1028-158-0x0000000007080000-0x000000000709A000-memory.dmp

        Filesize

        104KB

      • memory/1028-157-0x00000000076C0000-0x0000000007D3A000-memory.dmp

        Filesize

        6.5MB

      • memory/1028-156-0x0000000006320000-0x000000000633E000-memory.dmp

        Filesize

        120KB

      • memory/1028-155-0x000000006FCE0000-0x000000006FD2C000-memory.dmp

        Filesize

        304KB

      • memory/1028-162-0x00000000073C0000-0x00000000073DA000-memory.dmp

        Filesize

        104KB

      • memory/1028-145-0x0000000000000000-mapping.dmp

      • memory/1028-146-0x0000000002490000-0x00000000024C6000-memory.dmp

        Filesize

        216KB

      • memory/1028-161-0x00000000072B0000-0x00000000072BE000-memory.dmp

        Filesize

        56KB

      • memory/1028-149-0x0000000005140000-0x0000000005768000-memory.dmp

        Filesize

        6.2MB

      • memory/1028-160-0x0000000007300000-0x0000000007396000-memory.dmp

        Filesize

        600KB

      • memory/1028-151-0x0000000004DC0000-0x0000000004DE2000-memory.dmp

        Filesize

        136KB

      • memory/1028-159-0x00000000070F0000-0x00000000070FA000-memory.dmp

        Filesize

        40KB

      • memory/1028-153-0x0000000005D70000-0x0000000005D8E000-memory.dmp

        Filesize

        120KB

      • memory/1028-154-0x0000000006340000-0x0000000006372000-memory.dmp

        Filesize

        200KB

      • memory/1060-142-0x0000000000000000-mapping.dmp

      • memory/2516-172-0x0000000000000000-mapping.dmp

      • memory/2532-173-0x0000000000000000-mapping.dmp

      • memory/2820-171-0x0000000000000000-mapping.dmp

      • memory/3000-170-0x0000000000000000-mapping.dmp

      • memory/3704-165-0x0000000000000000-mapping.dmp

      • memory/3796-166-0x0000000000000000-mapping.dmp

      • memory/3868-164-0x0000000000000000-mapping.dmp

      • memory/4520-132-0x0000000000160000-0x0000000000222000-memory.dmp

        Filesize

        776KB

      • memory/4520-134-0x0000000004C20000-0x0000000004CB2000-memory.dmp

        Filesize

        584KB

      • memory/4520-133-0x00000000052A0000-0x0000000005844000-memory.dmp

        Filesize

        5.6MB

      • memory/4520-135-0x0000000004D90000-0x0000000004E2C000-memory.dmp

        Filesize

        624KB

      • memory/4884-147-0x0000000000000000-mapping.dmp

      • memory/4884-167-0x00000000066B0000-0x00000000066BA000-memory.dmp

        Filesize

        40KB

      • memory/4900-168-0x0000000000000000-mapping.dmp

      • memory/4952-139-0x0000000005260000-0x00000000052C6000-memory.dmp

        Filesize

        408KB

      • memory/4952-136-0x0000000000000000-mapping.dmp

      • memory/4952-137-0x0000000000400000-0x000000000048C000-memory.dmp

        Filesize

        560KB

      • memory/4952-140-0x0000000005EA0000-0x0000000005EB2000-memory.dmp

        Filesize

        72KB