Analysis

  • max time kernel
    134s
  • max time network
    180s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    08-05-2022 18:00

General

  • Target

    a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c.exe

  • Size

    629KB

  • MD5

    4df6edc58b2aee8108bbf41a5281a0b3

  • SHA1

    372c881c85e6dd404ff65a086b0c7dd8e300ec19

  • SHA256

    a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c

  • SHA512

    3787c1833a05a31e1aa9a92e5b2dc081911ca98a490bd78c978d20d3d6ff5c4ab9081e6f0d4fe31e190bc454a73ddd641391969e310ecfa65f79963f2e3e2455

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Windows Defender Security Host

C2

vilvaraj-32652.portmap.io:32652

Mutex

VNM_MUTEX_s1ArJSYbui8dt0HUpJ

Attributes
  • encryption_key

    8gl4TCjsLQUmqCIxalku

  • install_name

    Windows Defender Security Host.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Defender Security Host

  • subdirectory

    SubDir

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
  • Quasar Payload 1 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • VenomRAT

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

  • suricata: ET MALWARE Common RAT Connectivity Check Observed

    suricata: ET MALWARE Common RAT Connectivity Check Observed

  • Executes dropped EXE 4 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • 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). Likely ransomware behaviour.

  • Program crash 1 IoCs
  • 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 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 51 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c.exe
    "C:\Users\Admin\AppData\Local\Temp\a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:392
    • C:\Users\Admin\AppData\Local\Temp\a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c.exe
      "C:\Users\Admin\AppData\Local\Temp\a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c.exe"
      2⤵
        PID:2956
      • C:\Users\Admin\AppData\Local\Temp\a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c.exe
        "C:\Users\Admin\AppData\Local\Temp\a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c.exe"
        2⤵
        • Windows security modification
        • Adds Run key to start application
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2064
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks" /create /tn "Windows Defender Security Host" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:4880
        • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4736
          • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe
            "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe"
            4⤵
            • Executes dropped EXE
            • Checks computer location settings
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:4424
            • C:\Windows\SysWOW64\schtasks.exe
              "schtasks" /create /tn "Windows Defender Security Host" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe" /rl HIGHEST /f
              5⤵
              • Creates scheduled task(s)
              PID:3028
            • C:\Windows\SysWOW64\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\RHFNI30qHKkT.bat" "
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:228
              • C:\Windows\SysWOW64\chcp.com
                chcp 65001
                6⤵
                  PID:1332
                • C:\Windows\SysWOW64\PING.EXE
                  ping -n 10 localhost
                  6⤵
                  • Runs ping.exe
                  PID:4004
                • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe
                  "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe"
                  6⤵
                  • Executes dropped EXE
                  • Suspicious use of SetThreadContext
                  • Suspicious use of WriteProcessMemory
                  PID:1688
                  • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe
                    "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe"
                    7⤵
                    • Executes dropped EXE
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    PID:1860
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 4424 -s 2004
                5⤵
                • Program crash
                PID:1232
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            "powershell" Get-MpPreference -verbose
            3⤵
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:4368
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4424 -ip 4424
        1⤵
          PID:3924

        Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Windows Defender Security Host.exe.log

          Filesize

          507B

          MD5

          76ffb2f33cb32ade8fc862a67599e9d8

          SHA1

          920cc4ab75b36d2f9f6e979b74db568973c49130

          SHA256

          f1a3724670e3379318ec9c73f6f39058cab0ab013ba3cd90c047c3d701362310

          SHA512

          f33502c2e1bb30c05359bfc6819ca934642a1e01874e3060349127d792694d56ad22fccd6c9477b8ee50d66db35785779324273f509576b48b7f85577e001b4e

        • C:\Users\Admin\AppData\Local\Temp\RHFNI30qHKkT.bat

          Filesize

          231B

          MD5

          1ef09ff8ef8fab873a10492ba0fd84ac

          SHA1

          7c68ef68374b4b68e25f7ca108cd902bdceaf3ea

          SHA256

          dcd37242b5608167608764c5643571cffc7e4ae8445271142d10005f92265a62

          SHA512

          79efeb499ce7a44657170170862c9f7930369cb85383335c01ddfa6b6826513059f7f51ca37897e9d00a7cf386ecdc6856beefd444e6fb5362a97f093f94b7d5

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

          Filesize

          629KB

          MD5

          4df6edc58b2aee8108bbf41a5281a0b3

          SHA1

          372c881c85e6dd404ff65a086b0c7dd8e300ec19

          SHA256

          a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c

          SHA512

          3787c1833a05a31e1aa9a92e5b2dc081911ca98a490bd78c978d20d3d6ff5c4ab9081e6f0d4fe31e190bc454a73ddd641391969e310ecfa65f79963f2e3e2455

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

          Filesize

          629KB

          MD5

          4df6edc58b2aee8108bbf41a5281a0b3

          SHA1

          372c881c85e6dd404ff65a086b0c7dd8e300ec19

          SHA256

          a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c

          SHA512

          3787c1833a05a31e1aa9a92e5b2dc081911ca98a490bd78c978d20d3d6ff5c4ab9081e6f0d4fe31e190bc454a73ddd641391969e310ecfa65f79963f2e3e2455

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

          Filesize

          629KB

          MD5

          4df6edc58b2aee8108bbf41a5281a0b3

          SHA1

          372c881c85e6dd404ff65a086b0c7dd8e300ec19

          SHA256

          a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c

          SHA512

          3787c1833a05a31e1aa9a92e5b2dc081911ca98a490bd78c978d20d3d6ff5c4ab9081e6f0d4fe31e190bc454a73ddd641391969e310ecfa65f79963f2e3e2455

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

          Filesize

          629KB

          MD5

          4df6edc58b2aee8108bbf41a5281a0b3

          SHA1

          372c881c85e6dd404ff65a086b0c7dd8e300ec19

          SHA256

          a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c

          SHA512

          3787c1833a05a31e1aa9a92e5b2dc081911ca98a490bd78c978d20d3d6ff5c4ab9081e6f0d4fe31e190bc454a73ddd641391969e310ecfa65f79963f2e3e2455

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

          Filesize

          629KB

          MD5

          4df6edc58b2aee8108bbf41a5281a0b3

          SHA1

          372c881c85e6dd404ff65a086b0c7dd8e300ec19

          SHA256

          a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c

          SHA512

          3787c1833a05a31e1aa9a92e5b2dc081911ca98a490bd78c978d20d3d6ff5c4ab9081e6f0d4fe31e190bc454a73ddd641391969e310ecfa65f79963f2e3e2455

        • memory/228-156-0x0000000000000000-mapping.dmp

        • memory/392-133-0x00000000052B0000-0x000000000534C000-memory.dmp

          Filesize

          624KB

        • memory/392-130-0x00000000006B0000-0x0000000000754000-memory.dmp

          Filesize

          656KB

        • memory/392-132-0x0000000005170000-0x0000000005202000-memory.dmp

          Filesize

          584KB

        • memory/392-131-0x0000000005860000-0x0000000005E04000-memory.dmp

          Filesize

          5.6MB

        • memory/1332-158-0x0000000000000000-mapping.dmp

        • memory/1688-166-0x0000000000000000-mapping.dmp

        • memory/1860-168-0x0000000000000000-mapping.dmp

        • memory/2064-139-0x00000000063E0000-0x000000000641C000-memory.dmp

          Filesize

          240KB

        • memory/2064-138-0x0000000005E80000-0x0000000005E92000-memory.dmp

          Filesize

          72KB

        • memory/2064-137-0x0000000005270000-0x00000000052D6000-memory.dmp

          Filesize

          408KB

        • memory/2064-136-0x0000000000400000-0x000000000048C000-memory.dmp

          Filesize

          560KB

        • memory/2064-135-0x0000000000000000-mapping.dmp

        • memory/2956-134-0x0000000000000000-mapping.dmp

        • memory/3028-154-0x0000000000000000-mapping.dmp

        • memory/4004-159-0x0000000000000000-mapping.dmp

        • memory/4368-162-0x0000000006900000-0x000000000691E000-memory.dmp

          Filesize

          120KB

        • memory/4368-164-0x0000000007680000-0x000000000769A000-memory.dmp

          Filesize

          104KB

        • memory/4368-153-0x0000000006370000-0x000000000638E000-memory.dmp

          Filesize

          120KB

        • memory/4368-152-0x0000000005DE0000-0x0000000005E46000-memory.dmp

          Filesize

          408KB

        • memory/4368-151-0x0000000005BE0000-0x0000000005C02000-memory.dmp

          Filesize

          136KB

        • memory/4368-150-0x0000000005540000-0x0000000005B68000-memory.dmp

          Filesize

          6.2MB

        • memory/4368-160-0x0000000007550000-0x0000000007582000-memory.dmp

          Filesize

          200KB

        • memory/4368-149-0x0000000002A50000-0x0000000002A86000-memory.dmp

          Filesize

          216KB

        • memory/4368-161-0x00000000702B0000-0x00000000702FC000-memory.dmp

          Filesize

          304KB

        • memory/4368-174-0x0000000007890000-0x0000000007898000-memory.dmp

          Filesize

          32KB

        • memory/4368-163-0x0000000007CC0000-0x000000000833A000-memory.dmp

          Filesize

          6.5MB

        • memory/4368-165-0x00000000050B0000-0x00000000050BA000-memory.dmp

          Filesize

          40KB

        • memory/4368-173-0x00000000078B0000-0x00000000078CA000-memory.dmp

          Filesize

          104KB

        • memory/4368-144-0x0000000000000000-mapping.dmp

        • memory/4368-172-0x0000000005470000-0x000000000547E000-memory.dmp

          Filesize

          56KB

        • memory/4368-171-0x00000000078D0000-0x0000000007966000-memory.dmp

          Filesize

          600KB

        • memory/4424-145-0x0000000000000000-mapping.dmp

        • memory/4424-155-0x0000000007050000-0x000000000705A000-memory.dmp

          Filesize

          40KB

        • memory/4736-141-0x0000000000000000-mapping.dmp

        • memory/4880-140-0x0000000000000000-mapping.dmp