Analysis

  • max time kernel
    126s
  • max time network
    147s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    30-11-2022 17:31

General

  • Target

    29533c09c2ca85885835c2c3cbe3cba61b4310f14c170cc52bfc0d1bbf1779f5.exe

  • Size

    615KB

  • MD5

    76869ef841f2820d0bbadddc46fc3c9a

  • SHA1

    e827d9b426e4ef75f31e6e9d81f47e70da3ac3a2

  • SHA256

    29533c09c2ca85885835c2c3cbe3cba61b4310f14c170cc52bfc0d1bbf1779f5

  • SHA512

    582047f529fae9eacf9b4c762904b21c1d430d219e77b9bc65730e89c00be5f666a452f95cd1b0af067480eb9abd4446bf9431aa4afe2a4f68ad8226d1c11995

  • SSDEEP

    6144:QYhWwTVvvVDzRW1BHH3g1NWT+AKYEM+gW4SmSMX0zCVsVwX+v456/bT8GoaEKwae:dhHTVXFRW1ZpK2bNV0CgwuX8GmkAh

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 9 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 9 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
  • 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 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 44 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\29533c09c2ca85885835c2c3cbe3cba61b4310f14c170cc52bfc0d1bbf1779f5.exe
    "C:\Users\Admin\AppData\Local\Temp\29533c09c2ca85885835c2c3cbe3cba61b4310f14c170cc52bfc0d1bbf1779f5.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:2020
    • 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
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:892
      • 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:1788
      • 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:472
        • 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:864
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "powershell" Get-MpPreference -verbose
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1664
      • 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:1524
        • 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:1472
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\Users\Admin\AppData\Local\Temp\9irOw3yCWRRg.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:988
        • C:\Windows\SysWOW64\chcp.com
          chcp 65001
          4⤵
            PID:1700
          • 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
            PID:1716

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Execution

    Scheduled Task

    1
    T1053

    Persistence

    Modify Existing Service

    1
    T1031

    Scheduled Task

    1
    T1053

    Privilege Escalation

    Scheduled Task

    1
    T1053

    Defense Evasion

    Modify Registry

    3
    T1112

    Disabling Security Tools

    2
    T1089

    Install Root Certificate

    1
    T1130

    Discovery

    System Information Discovery

    1
    T1082

    Remote System Discovery

    1
    T1018

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\9irOw3yCWRRg.bat
      Filesize

      219B

      MD5

      33f95c0680fbbd64aa2ddcb50eeda69d

      SHA1

      11c36fcfd2736f7d955b44491f54429afb78b977

      SHA256

      8f94c9e366aed3ed7c9c765c241162d35d3ecab01e4e9b4a76e5de91f9a0edd2

      SHA512

      4e3ab4719c419186a3c7cf73ee9d3baeb84228ed6107c2ad79542429f06ea478eb4728669c7f4aaadf8b8e41994ef88b2def848f8c89d51a4fe6f016f3d6e64f

    • 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/472-67-0x0000000000FB0000-0x000000000103C000-memory.dmp
      Filesize

      560KB

    • memory/472-64-0x0000000000000000-mapping.dmp
    • memory/864-72-0x0000000000000000-mapping.dmp
    • memory/892-60-0x0000000000CA0000-0x0000000000D2C000-memory.dmp
      Filesize

      560KB

    • memory/892-56-0x0000000000000000-mapping.dmp
    • memory/988-75-0x0000000000000000-mapping.dmp
    • memory/1472-74-0x0000000000000000-mapping.dmp
    • memory/1524-73-0x0000000000000000-mapping.dmp
    • memory/1620-78-0x0000000000000000-mapping.dmp
    • memory/1664-69-0x0000000000000000-mapping.dmp
    • memory/1664-71-0x000000006EC70000-0x000000006F21B000-memory.dmp
      Filesize

      5.7MB

    • memory/1700-77-0x0000000000000000-mapping.dmp
    • memory/1716-79-0x0000000000000000-mapping.dmp
    • memory/1788-62-0x0000000000000000-mapping.dmp
    • memory/2020-54-0x00000000751A1000-0x00000000751A3000-memory.dmp
      Filesize

      8KB

    • memory/2020-59-0x0000000074690000-0x0000000074C3B000-memory.dmp
      Filesize

      5.7MB