Analysis

  • max time kernel
    128s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231222-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05-02-2024 04:25

General

  • Target

    91086ef2437049d4cfcb66149acf0d95.exe

  • Size

    653KB

  • MD5

    91086ef2437049d4cfcb66149acf0d95

  • SHA1

    ac9cfed7ccfcd8676b437e753abdf7fc06981f71

  • SHA256

    1c5bb8ac1735f400b18f16ed5daab07575ba4aaedb4da31ca5cd89205bb40141

  • SHA512

    effe216b30c6371065d467e585f95db5106c35376a8fe430880a4e965c3a7927fb0453945036b19a6e0e7ec3d4a1290eee6e2445b68cd748086082da29db8046

  • SSDEEP

    12288:bYBbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0Rqs4J7S:MBxrd4lA7OvR/fqKoqsxsvoyFtbsqsJ

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Windows firewall

C2

23.105.131.187:7812

Mutex

VNM_MUTEX_zGeT5SjdI1pYgFyiav

Attributes
  • encryption_key

    3kpwI2tkVNrXY2Mm5wlR

  • install_name

    Windows Security.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update

  • subdirectory

    Windows Firewall Updates

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.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 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.

  • Suspicious use of SetThreadContext 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 57 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe
    "C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1164
    • C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe
      "C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe"
      2⤵
        PID:804
      • C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe
        "C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.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:4612
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:5096
        • C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe
          "C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:1116
          • C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe
            "C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe"
            4⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:212
            • C:\Windows\SysWOW64\schtasks.exe
              "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe" /rl HIGHEST /f
              5⤵
              • Creates scheduled task(s)
              PID:2216
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "powershell" Get-MpPreference -verbose
          3⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:436
        • 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:728
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
            4⤵
              PID:2380
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\alOhDmUeZSCH.bat" "
            3⤵
            • Suspicious use of WriteProcessMemory
            PID:5068
            • C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe
              "C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe"
              4⤵
              • Suspicious use of SetThreadContext
              • Suspicious use of WriteProcessMemory
              PID:3748
              • C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe
                "C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe"
                5⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2088
      • C:\Windows\SysWOW64\chcp.com
        chcp 65001
        1⤵
          PID:2484
        • C:\Windows\SysWOW64\PING.EXE
          ping -n 10 localhost
          1⤵
          • Runs ping.exe
          PID:680

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\91086ef2437049d4cfcb66149acf0d95.exe.log

          Filesize

          507B

          MD5

          8cf94b5356be60247d331660005941ec

          SHA1

          fdedb361f40f22cb6a086c808fc0056d4e421131

          SHA256

          52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

          SHA512

          b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_kufzbunt.qdx.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

          Filesize

          229B

          MD5

          fd633dae329100c2d28b6a6d3a722387

          SHA1

          cd3c6b0e158f22fdcfc734024fab715f844b6cf0

          SHA256

          897a2d080eab3a34b16463c2fc196cee5703fbc01a6f03745604880e2557edf8

          SHA512

          8300d355bd86c9f83e42a53f4852b324c9ec372723addc7eeee5b67f353fa65cc4daa5e5eb3623564bd9ddebb4cd5e3108d4538d0e8839723e4479fec7a1f2e0

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

          Filesize

          653KB

          MD5

          91086ef2437049d4cfcb66149acf0d95

          SHA1

          ac9cfed7ccfcd8676b437e753abdf7fc06981f71

          SHA256

          1c5bb8ac1735f400b18f16ed5daab07575ba4aaedb4da31ca5cd89205bb40141

          SHA512

          effe216b30c6371065d467e585f95db5106c35376a8fe430880a4e965c3a7927fb0453945036b19a6e0e7ec3d4a1290eee6e2445b68cd748086082da29db8046

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

          Filesize

          12KB

          MD5

          9630ed5f362e22250bbf72082bf5200e

          SHA1

          480814a759f83a9f2bb4fa33e16c66c3a3ab4e6c

          SHA256

          e6ddd3d0ef4a03386089622db4ef0b76c8333ca667a9debc732df0cd9e8ad632

          SHA512

          f9a95652c116b0a12cb3e79ea996078c8a146ab1fe3d9822505963b24b89286c4275901b60ff64c1293d690e19bfac76faf64abadc46b1b91d59e319bf959e28

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

          Filesize

          416KB

          MD5

          b7d9b96d618bbc8011bcc29829e69a94

          SHA1

          9a98a2d7e9a997900478b8d0d88200bfbe282334

          SHA256

          196623888e79ff93a90bbf8eda2ee15d853637e7746a257b1640942bd2ce8ce1

          SHA512

          17e8ca1648bc8ad49c8067aa96423c1fae6b7830b314fa5dc5fd9a4bbba3a9b2679946fb72e16a408186873980429d2479d982ded21376cb5ce0e019335a74e5

        • memory/212-84-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/212-89-0x00000000053A0000-0x00000000053B0000-memory.dmp

          Filesize

          64KB

        • memory/212-49-0x0000000006B50000-0x0000000006B5A000-memory.dmp

          Filesize

          40KB

        • memory/212-33-0x00000000053A0000-0x00000000053B0000-memory.dmp

          Filesize

          64KB

        • memory/212-31-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/436-45-0x0000000005D30000-0x0000000006084000-memory.dmp

          Filesize

          3.3MB

        • memory/436-73-0x0000000007820000-0x000000000783A000-memory.dmp

          Filesize

          104KB

        • memory/436-77-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/436-74-0x0000000007800000-0x0000000007808000-memory.dmp

          Filesize

          32KB

        • memory/436-72-0x0000000007720000-0x0000000007734000-memory.dmp

          Filesize

          80KB

        • memory/436-24-0x00000000028E0000-0x0000000002916000-memory.dmp

          Filesize

          216KB

        • memory/436-71-0x0000000007710000-0x000000000771E000-memory.dmp

          Filesize

          56KB

        • memory/436-26-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/436-70-0x00000000076E0000-0x00000000076F1000-memory.dmp

          Filesize

          68KB

        • memory/436-25-0x0000000002890000-0x00000000028A0000-memory.dmp

          Filesize

          64KB

        • memory/436-69-0x0000000007760000-0x00000000077F6000-memory.dmp

          Filesize

          600KB

        • memory/436-30-0x0000000005310000-0x0000000005938000-memory.dmp

          Filesize

          6.2MB

        • memory/436-68-0x0000000007550000-0x000000000755A000-memory.dmp

          Filesize

          40KB

        • memory/436-66-0x0000000007B20000-0x000000000819A000-memory.dmp

          Filesize

          6.5MB

        • memory/436-67-0x00000000074E0000-0x00000000074FA000-memory.dmp

          Filesize

          104KB

        • memory/436-50-0x000000007F2A0000-0x000000007F2B0000-memory.dmp

          Filesize

          64KB

        • memory/436-63-0x0000000002890000-0x00000000028A0000-memory.dmp

          Filesize

          64KB

        • memory/436-34-0x0000000005940000-0x0000000005962000-memory.dmp

          Filesize

          136KB

        • memory/436-40-0x0000000005AE0000-0x0000000005B46000-memory.dmp

          Filesize

          408KB

        • memory/436-65-0x00000000073B0000-0x0000000007453000-memory.dmp

          Filesize

          652KB

        • memory/436-46-0x00000000061D0000-0x00000000061EE000-memory.dmp

          Filesize

          120KB

        • memory/436-47-0x00000000061F0000-0x000000000623C000-memory.dmp

          Filesize

          304KB

        • memory/436-62-0x0000000006790000-0x00000000067AE000-memory.dmp

          Filesize

          120KB

        • memory/436-52-0x000000006FE20000-0x000000006FE6C000-memory.dmp

          Filesize

          304KB

        • memory/436-51-0x0000000007170000-0x00000000071A2000-memory.dmp

          Filesize

          200KB

        • memory/436-64-0x0000000002890000-0x00000000028A0000-memory.dmp

          Filesize

          64KB

        • memory/1116-32-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/1116-23-0x0000000005710000-0x0000000005720000-memory.dmp

          Filesize

          64KB

        • memory/1116-22-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/1164-3-0x0000000005DB0000-0x0000000006354000-memory.dmp

          Filesize

          5.6MB

        • memory/1164-4-0x00000000056A0000-0x0000000005732000-memory.dmp

          Filesize

          584KB

        • memory/1164-7-0x00000000031A0000-0x00000000031AA000-memory.dmp

          Filesize

          40KB

        • memory/1164-5-0x0000000005740000-0x00000000057DC000-memory.dmp

          Filesize

          624KB

        • memory/1164-12-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/1164-0-0x0000000000B80000-0x0000000000C2A000-memory.dmp

          Filesize

          680KB

        • memory/1164-1-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/1164-2-0x00000000057F0000-0x0000000005800000-memory.dmp

          Filesize

          64KB

        • memory/2088-90-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/2088-88-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/3748-83-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/3748-85-0x0000000004EA0000-0x0000000004EB0000-memory.dmp

          Filesize

          64KB

        • memory/3748-87-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/4612-82-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB

        • memory/4612-15-0x0000000005D90000-0x0000000005DA2000-memory.dmp

          Filesize

          72KB

        • memory/4612-8-0x0000000000400000-0x000000000048C000-memory.dmp

          Filesize

          560KB

        • memory/4612-16-0x0000000006410000-0x000000000644C000-memory.dmp

          Filesize

          240KB

        • memory/4612-14-0x0000000005090000-0x00000000050F6000-memory.dmp

          Filesize

          408KB

        • memory/4612-13-0x0000000004FA0000-0x0000000004FB0000-memory.dmp

          Filesize

          64KB

        • memory/4612-11-0x0000000074980000-0x0000000075130000-memory.dmp

          Filesize

          7.7MB