Analysis

  • max time kernel
    142s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    25-11-2022 08:51

General

  • Target

    8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34.exe

  • Size

    611KB

  • MD5

    cc65b79bc0887658e9c592071bf8cb91

  • SHA1

    a45592c19ed3c8579972c7c7e19ba01af2894348

  • SHA256

    8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34

  • SHA512

    0f0155a099487c91485b1df911fdbc4ae00fbbcd9ce48954daffadfe72247dc3d1f1af58d41081216a8977f43d277eb6578d8d4f04dceae32a361168c288b719

  • SSDEEP

    6144:4iBZTVvvVDzRW1BHH3g1NWT+AKYEM+gW4SmSMX0zCVsVwX+v456/Z9ZGoaEKwa/W:4AZTVXFRW1ZpK2bNV0Cgwu/ZGmkAh

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

RAT

C2

23.105.131.178:7812

Mutex

VNM_MUTEX_It9SqdFDNndEItXfKp

Attributes
  • encryption_key

    txgQXKaATimN7DY8jnPH

  • install_name

    Windows Defender Security.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update

  • subdirectory

    Microsoft

Signatures

  • Contains code to disable Windows Defender 10 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 10 IoCs
  • VenomRAT

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

  • Executes dropped EXE 3 IoCs
  • Deletes itself 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 1 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.

  • 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
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 44 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34.exe
    "C:\Users\Admin\AppData\Local\Temp\8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1904
    • C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe
      "C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe"
      2⤵
      • 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:1072
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:524
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows Defender Security.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows Defender Security.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:1796
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Windows Defender Security.exe" /rl HIGHEST /f
          4⤵
          • Creates scheduled task(s)
          PID:1532
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "powershell" Get-MpPreference -verbose
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:628
      • 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:620
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
          4⤵
          • Deletes itself
          PID:1404
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\Users\Admin\AppData\Local\Temp\0lZXwvtKueHK.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1084
        • C:\Windows\SysWOW64\chcp.com
          chcp 65001
          4⤵
            PID:1664
          • C:\Windows\SysWOW64\PING.EXE
            ping -n 10 localhost
            4⤵
            • Runs ping.exe
            PID:1620
          • C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe
            "C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe"
            4⤵
            • Executes dropped EXE
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:996

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\0lZXwvtKueHK.bat

      Filesize

      219B

      MD5

      4ae2fd69b15881709c5e7e626f613fad

      SHA1

      b0c12d19397ab25a782116f9895505a0e6b72ae7

      SHA256

      50e8d5a0fee2ec1e7fc379630989bfadcccc3de727f905640cd3eb062ea17c7e

      SHA512

      71d7b47502a2a52b773986f77fd665a0f1714d222d06d7787acc1ac528829598f0269d62760e9229a9aa154b65c6b59e37d7e36903e05554917ee091b54a6d33

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

      Filesize

      535KB

      MD5

      0bd3018c9c566328497be54c7d882159

      SHA1

      8d90c23ee373ab935ba930f25c96374762c4a5a6

      SHA256

      026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176

      SHA512

      90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc

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

      Filesize

      535KB

      MD5

      0bd3018c9c566328497be54c7d882159

      SHA1

      8d90c23ee373ab935ba930f25c96374762c4a5a6

      SHA256

      026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176

      SHA512

      90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc

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

      Filesize

      535KB

      MD5

      0bd3018c9c566328497be54c7d882159

      SHA1

      8d90c23ee373ab935ba930f25c96374762c4a5a6

      SHA256

      026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176

      SHA512

      90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc

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

      Filesize

      535KB

      MD5

      0bd3018c9c566328497be54c7d882159

      SHA1

      8d90c23ee373ab935ba930f25c96374762c4a5a6

      SHA256

      026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176

      SHA512

      90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc

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

      Filesize

      535KB

      MD5

      0bd3018c9c566328497be54c7d882159

      SHA1

      8d90c23ee373ab935ba930f25c96374762c4a5a6

      SHA256

      026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176

      SHA512

      90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc

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

      Filesize

      535KB

      MD5

      0bd3018c9c566328497be54c7d882159

      SHA1

      8d90c23ee373ab935ba930f25c96374762c4a5a6

      SHA256

      026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176

      SHA512

      90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc

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

      Filesize

      535KB

      MD5

      0bd3018c9c566328497be54c7d882159

      SHA1

      8d90c23ee373ab935ba930f25c96374762c4a5a6

      SHA256

      026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176

      SHA512

      90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc

    • memory/628-73-0x000000006F840000-0x000000006FDEB000-memory.dmp

      Filesize

      5.7MB

    • memory/628-74-0x000000006F840000-0x000000006FDEB000-memory.dmp

      Filesize

      5.7MB

    • memory/996-83-0x00000000003E0000-0x000000000046C000-memory.dmp

      Filesize

      560KB

    • memory/1072-61-0x0000000000810000-0x000000000089C000-memory.dmp

      Filesize

      560KB

    • memory/1796-68-0x0000000000BB0000-0x0000000000C3C000-memory.dmp

      Filesize

      560KB

    • memory/1904-54-0x0000000076DC1000-0x0000000076DC3000-memory.dmp

      Filesize

      8KB

    • memory/1904-55-0x0000000074E70000-0x000000007541B000-memory.dmp

      Filesize

      5.7MB

    • memory/1904-60-0x0000000074E70000-0x000000007541B000-memory.dmp

      Filesize

      5.7MB