Analysis

  • max time kernel
    172s
  • max time network
    208s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    30-11-2022 15:45

General

  • Target

    4e07acab1178209379b2f3926e63da1a3002c9640667907db610216bd6e02e72.exe

  • Size

    606KB

  • MD5

    c23863e0d7186334ca69903c6653ae06

  • SHA1

    6040256f4dabd5ee5dee6560e04c56f699532db6

  • SHA256

    4e07acab1178209379b2f3926e63da1a3002c9640667907db610216bd6e02e72

  • SHA512

    b9a7ffaa9a01a488efd29a9f9162c95a8c50f25d2183679f4783ce900319d81f4d375518667959b89bf8df002a869736a2c47bccae3b8ec5844f8f31c2fa7759

  • SSDEEP

    12288:HDNN+IaAFB0OLrdd5xSx8G3cK6TsrId6dd4WCWd9nNxtSR9UcN+Pjv:HDr+FqVvL5x4RcKYd83CWd9+UPv

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

hacked

C2

23.105.131.178:7812

Mutex

VNM_MUTEX_cFzA15c8rYLW8gVTCh

Attributes
  • encryption_key

    VGvtyILUmmcgl2gY0sSm

  • install_name

    Windows Security Health Service.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 2 IoCs
  • Loads dropped DLL 1 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 2 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 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 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 46 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4e07acab1178209379b2f3926e63da1a3002c9640667907db610216bd6e02e72.exe
    "C:\Users\Admin\AppData\Local\Temp\4e07acab1178209379b2f3926e63da1a3002c9640667907db610216bd6e02e72.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2044
    • C:\Users\Admin\AppData\Local\Temp\4e07acab1178209379b2f3926e63da1a3002c9640667907db610216bd6e02e72.exe
      "C:\Users\Admin\AppData\Local\Temp\4e07acab1178209379b2f3926e63da1a3002c9640667907db610216bd6e02e72.exe"
      2⤵
      • Modifies Windows Defender Real-time Protection settings
      • Loads dropped DLL
      • Windows security modification
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1256
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\4e07acab1178209379b2f3926e63da1a3002c9640667907db610216bd6e02e72.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:1052
      • C:\Users\Admin\AppData\Roaming\SubDir\Windows Security Health Service.exe
        "C:\Users\Admin\AppData\Roaming\SubDir\Windows Security Health Service.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:924
        • C:\Users\Admin\AppData\Roaming\SubDir\Windows Security Health Service.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\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:928
          • C:\Windows\SysWOW64\schtasks.exe
            "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Windows Security Health Service.exe" /rl HIGHEST /f
            5⤵
            • Creates scheduled task(s)
            PID:800
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "powershell" Get-MpPreference -verbose
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1760
      • 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:1220
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
          4⤵
            PID:1212
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1256 -s 2012
          3⤵
          • Program crash
          PID:268

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\WEknQP9rN4jp.bat

      Filesize

      261B

      MD5

      bc9689263a9bbf07f2f80a3725674809

      SHA1

      7a298391b69e80f8588eebbe4c5d61e8eccc77eb

      SHA256

      93bc12c06d681de8ed994b4c4c466b8f198d9dc55a2462eaa8f969d7b0968936

      SHA512

      0129cfa73fe4fb8f52ea1ed6662a75650f565e4a26c5c57e651147cd17c04df5810ee88b1befbefd81fbb2346fe78ad8766eed69c7212a72ab582d614741596c

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

      Filesize

      606KB

      MD5

      c23863e0d7186334ca69903c6653ae06

      SHA1

      6040256f4dabd5ee5dee6560e04c56f699532db6

      SHA256

      4e07acab1178209379b2f3926e63da1a3002c9640667907db610216bd6e02e72

      SHA512

      b9a7ffaa9a01a488efd29a9f9162c95a8c50f25d2183679f4783ce900319d81f4d375518667959b89bf8df002a869736a2c47bccae3b8ec5844f8f31c2fa7759

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

      Filesize

      606KB

      MD5

      c23863e0d7186334ca69903c6653ae06

      SHA1

      6040256f4dabd5ee5dee6560e04c56f699532db6

      SHA256

      4e07acab1178209379b2f3926e63da1a3002c9640667907db610216bd6e02e72

      SHA512

      b9a7ffaa9a01a488efd29a9f9162c95a8c50f25d2183679f4783ce900319d81f4d375518667959b89bf8df002a869736a2c47bccae3b8ec5844f8f31c2fa7759

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

      Filesize

      606KB

      MD5

      c23863e0d7186334ca69903c6653ae06

      SHA1

      6040256f4dabd5ee5dee6560e04c56f699532db6

      SHA256

      4e07acab1178209379b2f3926e63da1a3002c9640667907db610216bd6e02e72

      SHA512

      b9a7ffaa9a01a488efd29a9f9162c95a8c50f25d2183679f4783ce900319d81f4d375518667959b89bf8df002a869736a2c47bccae3b8ec5844f8f31c2fa7759

    • \Users\Admin\AppData\Roaming\SubDir\Windows Security Health Service.exe

      Filesize

      606KB

      MD5

      c23863e0d7186334ca69903c6653ae06

      SHA1

      6040256f4dabd5ee5dee6560e04c56f699532db6

      SHA256

      4e07acab1178209379b2f3926e63da1a3002c9640667907db610216bd6e02e72

      SHA512

      b9a7ffaa9a01a488efd29a9f9162c95a8c50f25d2183679f4783ce900319d81f4d375518667959b89bf8df002a869736a2c47bccae3b8ec5844f8f31c2fa7759

    • memory/268-96-0x0000000000000000-mapping.dmp

    • memory/800-90-0x0000000000000000-mapping.dmp

    • memory/924-71-0x0000000000000000-mapping.dmp

    • memory/924-74-0x0000000000070000-0x000000000010E000-memory.dmp

      Filesize

      632KB

    • memory/928-82-0x0000000000486C0E-mapping.dmp

    • memory/1052-69-0x0000000000000000-mapping.dmp

    • memory/1212-94-0x0000000000000000-mapping.dmp

    • memory/1220-93-0x0000000000000000-mapping.dmp

    • memory/1256-67-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1256-63-0x0000000000486C0E-mapping.dmp

    • memory/1256-57-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1256-61-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1256-62-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1256-58-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1256-60-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1256-65-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/1760-91-0x000000006F350000-0x000000006F8FB000-memory.dmp

      Filesize

      5.7MB

    • memory/1760-92-0x000000006F350000-0x000000006F8FB000-memory.dmp

      Filesize

      5.7MB

    • memory/1760-77-0x0000000000000000-mapping.dmp

    • memory/2044-56-0x0000000000320000-0x000000000032A000-memory.dmp

      Filesize

      40KB

    • memory/2044-55-0x0000000075881000-0x0000000075883000-memory.dmp

      Filesize

      8KB

    • memory/2044-54-0x0000000001130000-0x00000000011CE000-memory.dmp

      Filesize

      632KB