Analysis

  • max time kernel
    135s
  • max time network
    160s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24-01-2024 14:58

General

  • Target

    7289c479c6a3839e87342411a5a49c54.exe

  • Size

    657KB

  • MD5

    7289c479c6a3839e87342411a5a49c54

  • SHA1

    baf866517df277c66f2c13168b15119ba3ec3a92

  • SHA256

    22101f7ae824387a41052dfc0891096efb5ab47859727131465eeadcc1412a58

  • SHA512

    17397fe4a4d2bae32854d917ba706c37e266ab1cc1b8e9a41bb13a7ca92348aa894169388a4d5f96f1b9e31f40ee358caa07d537c9f67b94c2f3f219905eadc1

  • SSDEEP

    12288:lVBbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0RqsA7M:vBxrd4lA7OvR/fqKoqsxsvoyFtbsqsF

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 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 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 14 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 60 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe
    "C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:5104
    • C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe
      "C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe"
      2⤵
      • Modifies Windows Defender Real-time Protection settings
      • Checks computer location settings
      • Windows security modification
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3032
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:1416
      • 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:3148
        • 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:2016
          • 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:2220
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "powershell" Get-MpPreference -verbose
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3944
      • 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:2032
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
          4⤵
            PID:4384
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\vGM9EVCUJunL.bat" "
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:3420
          • C:\Windows\SysWOW64\chcp.com
            chcp 65001
            4⤵
              PID:5104
            • C:\Windows\SysWOW64\PING.EXE
              ping -n 10 localhost
              4⤵
              • Runs ping.exe
              PID:2408
            • C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe
              "C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe"
              4⤵
              • Suspicious use of SetThreadContext
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              PID:952
              • C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe
                "C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe"
                5⤵
                  PID:1260
                • C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe
                  "C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe"
                  5⤵
                    PID:1844
                  • C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe
                    "C:\Users\Admin\AppData\Local\Temp\7289c479c6a3839e87342411a5a49c54.exe"
                    5⤵
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    PID:4288

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\7289c479c6a3839e87342411a5a49c54.exe.log

            Filesize

            507B

            MD5

            8cf94b5356be60247d331660005941ec

            SHA1

            fdedb361f40f22cb6a086c808fc0056d4e421131

            SHA256

            52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

            SHA512

            b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

          • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_z3emqcjl.z4f.ps1

            Filesize

            60B

            MD5

            d17fe0a3f47be24a6453e9ef58c94641

            SHA1

            6ab83620379fc69f80c0242105ddffd7d98d5d9d

            SHA256

            96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

            SHA512

            5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

          • C:\Users\Admin\AppData\Local\Temp\vGM9EVCUJunL.bat

            Filesize

            229B

            MD5

            80a7cfd5db31b0055bf84a484f5d013a

            SHA1

            f7ff076613bdf3718c36ccb2a47bb714baba3dc9

            SHA256

            49a19e5ea631a440544281aa59e64b2f5fd4c18e239169ab8558704edb9444bc

            SHA512

            4f72b9e36940687ce9456b3f821a35a0118c075be6da6d46292b739fb094ea28d5e8ae479a69fba090d6a7110eee09475da72a8c6af716468811c6d3e0a9f1f5

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

            Filesize

            657KB

            MD5

            7289c479c6a3839e87342411a5a49c54

            SHA1

            baf866517df277c66f2c13168b15119ba3ec3a92

            SHA256

            22101f7ae824387a41052dfc0891096efb5ab47859727131465eeadcc1412a58

            SHA512

            17397fe4a4d2bae32854d917ba706c37e266ab1cc1b8e9a41bb13a7ca92348aa894169388a4d5f96f1b9e31f40ee358caa07d537c9f67b94c2f3f219905eadc1

          • memory/952-87-0x0000000004E50000-0x0000000004E60000-memory.dmp

            Filesize

            64KB

          • memory/952-86-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/952-89-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/2016-25-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/2016-47-0x0000000007190000-0x000000000719A000-memory.dmp

            Filesize

            40KB

          • memory/2016-70-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/2016-75-0x0000000005AB0000-0x0000000005AC0000-memory.dmp

            Filesize

            64KB

          • memory/2016-28-0x0000000005AB0000-0x0000000005AC0000-memory.dmp

            Filesize

            64KB

          • memory/3032-29-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/3032-11-0x0000000005270000-0x0000000005280000-memory.dmp

            Filesize

            64KB

          • memory/3032-15-0x0000000006850000-0x000000000688C000-memory.dmp

            Filesize

            240KB

          • memory/3032-10-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/3032-31-0x0000000005270000-0x0000000005280000-memory.dmp

            Filesize

            64KB

          • memory/3032-13-0x00000000056C0000-0x0000000005726000-memory.dmp

            Filesize

            408KB

          • memory/3032-85-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/3032-8-0x0000000000400000-0x000000000048C000-memory.dmp

            Filesize

            560KB

          • memory/3032-14-0x00000000062D0000-0x00000000062E2000-memory.dmp

            Filesize

            72KB

          • memory/3148-22-0x00000000030B0000-0x00000000030C0000-memory.dmp

            Filesize

            64KB

          • memory/3148-21-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/3148-27-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/3944-51-0x000000007F030000-0x000000007F040000-memory.dmp

            Filesize

            64KB

          • memory/3944-71-0x0000000007E70000-0x0000000007E7E000-memory.dmp

            Filesize

            56KB

          • memory/3944-35-0x0000000005980000-0x00000000059E6000-memory.dmp

            Filesize

            408KB

          • memory/3944-48-0x0000000006900000-0x000000000691E000-memory.dmp

            Filesize

            120KB

          • memory/3944-49-0x0000000006990000-0x00000000069DC000-memory.dmp

            Filesize

            304KB

          • memory/3944-50-0x0000000005420000-0x0000000005430000-memory.dmp

            Filesize

            64KB

          • memory/3944-34-0x00000000058E0000-0x0000000005902000-memory.dmp

            Filesize

            136KB

          • memory/3944-52-0x00000000078E0000-0x0000000007912000-memory.dmp

            Filesize

            200KB

          • memory/3944-53-0x0000000070530000-0x000000007057C000-memory.dmp

            Filesize

            304KB

          • memory/3944-63-0x0000000006C80000-0x0000000006C9E000-memory.dmp

            Filesize

            120KB

          • memory/3944-64-0x0000000007920000-0x00000000079C3000-memory.dmp

            Filesize

            652KB

          • memory/3944-65-0x0000000008290000-0x000000000890A000-memory.dmp

            Filesize

            6.5MB

          • memory/3944-66-0x0000000007C40000-0x0000000007C5A000-memory.dmp

            Filesize

            104KB

          • memory/3944-67-0x0000000007CB0000-0x0000000007CBA000-memory.dmp

            Filesize

            40KB

          • memory/3944-68-0x0000000007EC0000-0x0000000007F56000-memory.dmp

            Filesize

            600KB

          • memory/3944-69-0x0000000007E40000-0x0000000007E51000-memory.dmp

            Filesize

            68KB

          • memory/3944-33-0x0000000005A60000-0x0000000006088000-memory.dmp

            Filesize

            6.2MB

          • memory/3944-41-0x0000000006210000-0x0000000006564000-memory.dmp

            Filesize

            3.3MB

          • memory/3944-72-0x0000000007E80000-0x0000000007E94000-memory.dmp

            Filesize

            80KB

          • memory/3944-73-0x0000000007F80000-0x0000000007F9A000-memory.dmp

            Filesize

            104KB

          • memory/3944-74-0x0000000007F60000-0x0000000007F68000-memory.dmp

            Filesize

            32KB

          • memory/3944-32-0x00000000052F0000-0x0000000005326000-memory.dmp

            Filesize

            216KB

          • memory/3944-76-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/3944-79-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/3944-30-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/4288-90-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/4288-91-0x0000000005720000-0x0000000005730000-memory.dmp

            Filesize

            64KB

          • memory/4288-92-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/5104-4-0x0000000004C70000-0x0000000004D02000-memory.dmp

            Filesize

            584KB

          • memory/5104-3-0x0000000005180000-0x0000000005724000-memory.dmp

            Filesize

            5.6MB

          • memory/5104-2-0x0000000004BC0000-0x0000000004BD0000-memory.dmp

            Filesize

            64KB

          • memory/5104-1-0x0000000000170000-0x000000000021A000-memory.dmp

            Filesize

            680KB

          • memory/5104-0-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB

          • memory/5104-5-0x0000000004D10000-0x0000000004DAC000-memory.dmp

            Filesize

            624KB

          • memory/5104-7-0x0000000004BF0000-0x0000000004BFA000-memory.dmp

            Filesize

            40KB

          • memory/5104-12-0x00000000752A0000-0x0000000075A50000-memory.dmp

            Filesize

            7.7MB