Analysis

  • max time kernel
    130s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231222-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-02-2024 13:20

General

  • Target

    99862073a5f3df00516a49e3b78057b1.exe

  • Size

    635KB

  • MD5

    99862073a5f3df00516a49e3b78057b1

  • SHA1

    46ac6d3ec2cb7d90d946a1470b5dff98eecee011

  • SHA256

    bb1956f934dfbebe914a54e3445b5fbafac60e2672794a5e14ed4d1999d5aed2

  • SHA512

    d0d248502db680f17ed2e8d750d809796320c41395284df0df9967fac852f6b39a05df33f5054cc8e45ba116c61eb2c112e3038a26b3fada34056e36f1400629

  • SSDEEP

    12288:Z+ifBbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0Rqs+8s7b:csBxrd4lA7OvR/fqKoqsxsvoyFtbsqsK

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 2 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.

  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 40 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe
    "C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1500
    • C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe
      "C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe"
      2⤵
        PID:4904
      • C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe
        "C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.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:1608
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:724
        • 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:1204
          • 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:2028
            • 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:1784
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "powershell" Get-MpPreference -verbose
          3⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2012
        • 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:2944
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
            4⤵
              PID:2580
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\2x6w33cRv9qt.bat" "
            3⤵
              PID:384

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\99862073a5f3df00516a49e3b78057b1.exe.log

          Filesize

          507B

          MD5

          8cf94b5356be60247d331660005941ec

          SHA1

          fdedb361f40f22cb6a086c808fc0056d4e421131

          SHA256

          52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

          SHA512

          b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

        • C:\Users\Admin\AppData\Local\Temp\2x6w33cRv9qt.bat

          Filesize

          229B

          MD5

          555767beac6f0ed9366a415e11c21ab8

          SHA1

          1ad51e6c18fd78b48f9f5325e2437fc1a9db880f

          SHA256

          f904a8079a3e4f847b12266fe40bd3c1751858a78bcc6ebee8e510723a957329

          SHA512

          f654e0d0064c4fbb7d0e091a1611fc7da2ecde6910d90563804a136ac7dddf06bd22e196959876b9aa1e0aa0d2f02dd08b6229e273c386548912ab17b623e088

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_wwly55cj.bv4.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

          Filesize

          635KB

          MD5

          99862073a5f3df00516a49e3b78057b1

          SHA1

          46ac6d3ec2cb7d90d946a1470b5dff98eecee011

          SHA256

          bb1956f934dfbebe914a54e3445b5fbafac60e2672794a5e14ed4d1999d5aed2

          SHA512

          d0d248502db680f17ed2e8d750d809796320c41395284df0df9967fac852f6b39a05df33f5054cc8e45ba116c61eb2c112e3038a26b3fada34056e36f1400629

        • memory/1204-23-0x0000000005440000-0x0000000005450000-memory.dmp

          Filesize

          64KB

        • memory/1204-22-0x0000000074600000-0x0000000074DB0000-memory.dmp

          Filesize

          7.7MB

        • memory/1204-34-0x0000000074600000-0x0000000074DB0000-memory.dmp

          Filesize

          7.7MB

        • memory/1500-5-0x0000000004CF0000-0x0000000004D82000-memory.dmp

          Filesize

          584KB

        • memory/1500-3-0x00000000026C0000-0x00000000026CA000-memory.dmp

          Filesize

          40KB

        • memory/1500-8-0x0000000004C50000-0x0000000004C5A000-memory.dmp

          Filesize

          40KB

        • memory/1500-1-0x0000000074600000-0x0000000074DB0000-memory.dmp

          Filesize

          7.7MB

        • memory/1500-13-0x0000000074600000-0x0000000074DB0000-memory.dmp

          Filesize

          7.7MB

        • memory/1500-0-0x0000000000170000-0x0000000000214000-memory.dmp

          Filesize

          656KB

        • memory/1500-2-0x0000000004CE0000-0x0000000004CF0000-memory.dmp

          Filesize

          64KB

        • memory/1500-4-0x00000000052A0000-0x0000000005844000-memory.dmp

          Filesize

          5.6MB

        • memory/1500-6-0x0000000004D90000-0x0000000004E2C000-memory.dmp

          Filesize

          624KB

        • memory/1608-16-0x0000000006A50000-0x0000000006A8C000-memory.dmp

          Filesize

          240KB

        • memory/1608-9-0x0000000000400000-0x000000000048C000-memory.dmp

          Filesize

          560KB

        • memory/1608-82-0x0000000074600000-0x0000000074DB0000-memory.dmp

          Filesize

          7.7MB

        • memory/1608-15-0x0000000005C20000-0x0000000005C32000-memory.dmp

          Filesize

          72KB

        • memory/1608-14-0x00000000057D0000-0x0000000005836000-memory.dmp

          Filesize

          408KB

        • memory/1608-12-0x0000000074600000-0x0000000074DB0000-memory.dmp

          Filesize

          7.7MB

        • memory/2012-36-0x0000000006200000-0x0000000006266000-memory.dmp

          Filesize

          408KB

        • memory/2012-63-0x0000000002EB0000-0x0000000002EC0000-memory.dmp

          Filesize

          64KB

        • memory/2012-31-0x0000000002EB0000-0x0000000002EC0000-memory.dmp

          Filesize

          64KB

        • memory/2012-24-0x0000000002FA0000-0x0000000002FD6000-memory.dmp

          Filesize

          216KB

        • memory/2012-35-0x0000000005900000-0x0000000005922000-memory.dmp

          Filesize

          136KB

        • memory/2012-29-0x0000000005B60000-0x0000000006188000-memory.dmp

          Filesize

          6.2MB

        • memory/2012-28-0x0000000074600000-0x0000000074DB0000-memory.dmp

          Filesize

          7.7MB

        • memory/2012-46-0x0000000006450000-0x00000000067A4000-memory.dmp

          Filesize

          3.3MB

        • memory/2012-47-0x00000000068B0000-0x00000000068CE000-memory.dmp

          Filesize

          120KB

        • memory/2012-48-0x0000000006970000-0x00000000069BC000-memory.dmp

          Filesize

          304KB

        • memory/2012-25-0x0000000002EB0000-0x0000000002EC0000-memory.dmp

          Filesize

          64KB

        • memory/2012-51-0x000000007F900000-0x000000007F910000-memory.dmp

          Filesize

          64KB

        • memory/2012-53-0x000000006FAA0000-0x000000006FAEC000-memory.dmp

          Filesize

          304KB

        • memory/2012-52-0x0000000007870000-0x00000000078A2000-memory.dmp

          Filesize

          200KB

        • memory/2012-64-0x0000000006E70000-0x0000000006E8E000-memory.dmp

          Filesize

          120KB

        • memory/2012-77-0x0000000074600000-0x0000000074DB0000-memory.dmp

          Filesize

          7.7MB

        • memory/2012-65-0x00000000078B0000-0x0000000007953000-memory.dmp

          Filesize

          652KB

        • memory/2012-66-0x0000000008230000-0x00000000088AA000-memory.dmp

          Filesize

          6.5MB

        • memory/2012-67-0x0000000007BF0000-0x0000000007C0A000-memory.dmp

          Filesize

          104KB

        • memory/2012-68-0x0000000007C60000-0x0000000007C6A000-memory.dmp

          Filesize

          40KB

        • memory/2012-69-0x0000000007E70000-0x0000000007F06000-memory.dmp

          Filesize

          600KB

        • memory/2012-70-0x0000000007DF0000-0x0000000007E01000-memory.dmp

          Filesize

          68KB

        • memory/2012-71-0x0000000007E20000-0x0000000007E2E000-memory.dmp

          Filesize

          56KB

        • memory/2012-72-0x0000000007E30000-0x0000000007E44000-memory.dmp

          Filesize

          80KB

        • memory/2012-73-0x0000000007F30000-0x0000000007F4A000-memory.dmp

          Filesize

          104KB

        • memory/2012-74-0x0000000007F10000-0x0000000007F18000-memory.dmp

          Filesize

          32KB

        • memory/2028-32-0x0000000074600000-0x0000000074DB0000-memory.dmp

          Filesize

          7.7MB

        • memory/2028-50-0x0000000006AC0000-0x0000000006ACA000-memory.dmp

          Filesize

          40KB

        • memory/2028-33-0x00000000053D0000-0x00000000053E0000-memory.dmp

          Filesize

          64KB

        • memory/2028-83-0x0000000074600000-0x0000000074DB0000-memory.dmp

          Filesize

          7.7MB

        • memory/2028-84-0x00000000053D0000-0x00000000053E0000-memory.dmp

          Filesize

          64KB