Analysis

  • max time kernel
    151s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30-11-2022 17:49

General

  • Target

    b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe

  • Size

    680KB

  • MD5

    3d9e3bf3109bfe73bccfb57e360fe465

  • SHA1

    36bd2e71a35f678c8d1e8066e616706f2dcb8610

  • SHA256

    b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50

  • SHA512

    f24992b8f03df563eca83cce818a0d5af04094acde38af3d0acf1ec40ae87272156f56ab72121becbd82f77d296ad39b60939d2282e0167b11dcf3b33db43be7

  • SSDEEP

    12288:a5393whFOBbosXQsI6f9fqAPzzEeEZchCBywRiaxJDj8DkIonQmP0Ove/diuHc:a53uhFzsAibzzEe9wRiaLSkI8QhOQ18

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

ajith

C2

23.105.131.178:7812

Mutex

VNM_MUTEX_NdVd2sPSSqFdo7I35g

Attributes
  • encryption_key

    jyerms3KOWmt3C9DBFuq

  • install_name

    Windows Defender Security.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update

  • 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 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.

  • Executes dropped EXE 7 IoCs
  • Checks computer location settings 2 TTPs 2 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 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). 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.

  • 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 60 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe
    "C:\Users\Admin\AppData\Local\Temp\b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4224
    • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
      "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe" /silent
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:4176
      • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
        "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"
        3⤵
        • Modifies Windows Defender Real-time Protection settings
        • Executes dropped EXE
        • Checks computer location settings
        • Windows security modification
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1792
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe" /rl HIGHEST /f
          4⤵
          • Creates scheduled task(s)
          PID:4884
        • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4692
          • C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
            "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:4864
            • C:\Windows\SysWOW64\schtasks.exe
              "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe" /rl HIGHEST /f
              6⤵
              • Creates scheduled task(s)
              PID:2520
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "powershell" Get-MpPreference -verbose
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:4412
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:4236
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
            5⤵
              PID:4364
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\cYE22NScCqxp.bat" "
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:3928
            • C:\Windows\SysWOW64\chcp.com
              chcp 65001
              5⤵
                PID:1484
              • C:\Windows\SysWOW64\PING.EXE
                ping -n 10 localhost
                5⤵
                • Runs ping.exe
                PID:788
              • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
                "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"
                5⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of WriteProcessMemory
                PID:4576
                • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
                  "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"
                  6⤵
                  • Executes dropped EXE
                  PID:1648
                • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
                  "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"
                  6⤵
                  • Executes dropped EXE
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:2788

      Network

      MITRE ATT&CK Matrix ATT&CK v6

      Execution

      Scheduled Task

      1
      T1053

      Persistence

      Modify Existing Service

      1
      T1031

      Registry Run Keys / Startup Folder

      1
      T1060

      Scheduled Task

      1
      T1053

      Privilege Escalation

      Scheduled Task

      1
      T1053

      Defense Evasion

      Modify Registry

      3
      T1112

      Disabling Security Tools

      2
      T1089

      Discovery

      Query Registry

      1
      T1012

      System Information Discovery

      2
      T1082

      Remote System Discovery

      1
      T1018

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        507B

        MD5

        8cf94b5356be60247d331660005941ec

        SHA1

        fdedb361f40f22cb6a086c808fc0056d4e421131

        SHA256

        52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

        SHA512

        b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

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

        507B

        MD5

        8cf94b5356be60247d331660005941ec

        SHA1

        fdedb361f40f22cb6a086c808fc0056d4e421131

        SHA256

        52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

        SHA512

        b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

      • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
        Filesize

        648KB

        MD5

        763dd9b7f2a5183a1380bee36889f936

        SHA1

        cdc7f9911a853973fc83d0e1a51ee5e82da347c9

        SHA256

        4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

        SHA512

        7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

      • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
        Filesize

        648KB

        MD5

        763dd9b7f2a5183a1380bee36889f936

        SHA1

        cdc7f9911a853973fc83d0e1a51ee5e82da347c9

        SHA256

        4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

        SHA512

        7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

      • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
        Filesize

        648KB

        MD5

        763dd9b7f2a5183a1380bee36889f936

        SHA1

        cdc7f9911a853973fc83d0e1a51ee5e82da347c9

        SHA256

        4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

        SHA512

        7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

      • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
        Filesize

        648KB

        MD5

        763dd9b7f2a5183a1380bee36889f936

        SHA1

        cdc7f9911a853973fc83d0e1a51ee5e82da347c9

        SHA256

        4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

        SHA512

        7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

      • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
        Filesize

        648KB

        MD5

        763dd9b7f2a5183a1380bee36889f936

        SHA1

        cdc7f9911a853973fc83d0e1a51ee5e82da347c9

        SHA256

        4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

        SHA512

        7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

      • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
        Filesize

        648KB

        MD5

        763dd9b7f2a5183a1380bee36889f936

        SHA1

        cdc7f9911a853973fc83d0e1a51ee5e82da347c9

        SHA256

        4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

        SHA512

        7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

      • C:\Users\Admin\AppData\Local\Temp\cYE22NScCqxp.bat
        Filesize

        239B

        MD5

        59eb9ada666d22ee0eb96a46e3b78056

        SHA1

        998d1a5e4dfbf073679845b72a1ce876f4b32244

        SHA256

        3cf94e7ad743b6943300aa573b027578c749d3cd7a3dfd65ba55620846c3fa86

        SHA512

        9dae8774db8cbac0793452f5c1ffd94eea9e71b61f55bcd4fbfae5c5d3b1631e9ff07e329a7d3bbe1fdf24a64408ac50cf0dfc79e642820e83d563b3b05372ea

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

        648KB

        MD5

        763dd9b7f2a5183a1380bee36889f936

        SHA1

        cdc7f9911a853973fc83d0e1a51ee5e82da347c9

        SHA256

        4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

        SHA512

        7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

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

        648KB

        MD5

        763dd9b7f2a5183a1380bee36889f936

        SHA1

        cdc7f9911a853973fc83d0e1a51ee5e82da347c9

        SHA256

        4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

        SHA512

        7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

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

        648KB

        MD5

        763dd9b7f2a5183a1380bee36889f936

        SHA1

        cdc7f9911a853973fc83d0e1a51ee5e82da347c9

        SHA256

        4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

        SHA512

        7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

      • memory/788-177-0x0000000000000000-mapping.dmp
      • memory/1484-176-0x0000000000000000-mapping.dmp
      • memory/1648-180-0x0000000000000000-mapping.dmp
      • memory/1792-140-0x0000000000400000-0x000000000048C000-memory.dmp
        Filesize

        560KB

      • memory/1792-139-0x0000000000000000-mapping.dmp
      • memory/1792-145-0x00000000069B0000-0x00000000069EC000-memory.dmp
        Filesize

        240KB

      • memory/1792-144-0x0000000006440000-0x0000000006452000-memory.dmp
        Filesize

        72KB

      • memory/1792-143-0x0000000005880000-0x00000000058E6000-memory.dmp
        Filesize

        408KB

      • memory/2520-160-0x0000000000000000-mapping.dmp
      • memory/2788-182-0x0000000000000000-mapping.dmp
      • memory/3928-174-0x0000000000000000-mapping.dmp
      • memory/4176-132-0x0000000000000000-mapping.dmp
      • memory/4176-137-0x0000000004E00000-0x0000000004E92000-memory.dmp
        Filesize

        584KB

      • memory/4176-138-0x0000000004F60000-0x0000000004FFC000-memory.dmp
        Filesize

        624KB

      • memory/4176-136-0x00000000055F0000-0x0000000005B94000-memory.dmp
        Filesize

        5.6MB

      • memory/4176-135-0x0000000000380000-0x0000000000428000-memory.dmp
        Filesize

        672KB

      • memory/4236-172-0x0000000000000000-mapping.dmp
      • memory/4364-173-0x0000000000000000-mapping.dmp
      • memory/4412-157-0x0000000005D80000-0x0000000005DA2000-memory.dmp
        Filesize

        136KB

      • memory/4412-170-0x0000000007A50000-0x0000000007A6A000-memory.dmp
        Filesize

        104KB

      • memory/4412-165-0x0000000007D60000-0x00000000083DA000-memory.dmp
        Filesize

        6.5MB

      • memory/4412-166-0x0000000007710000-0x000000000772A000-memory.dmp
        Filesize

        104KB

      • memory/4412-167-0x0000000007780000-0x000000000778A000-memory.dmp
        Filesize

        40KB

      • memory/4412-168-0x0000000007990000-0x0000000007A26000-memory.dmp
        Filesize

        600KB

      • memory/4412-169-0x0000000007940000-0x000000000794E000-memory.dmp
        Filesize

        56KB

      • memory/4412-164-0x00000000069C0000-0x00000000069DE000-memory.dmp
        Filesize

        120KB

      • memory/4412-171-0x0000000007A30000-0x0000000007A38000-memory.dmp
        Filesize

        32KB

      • memory/4412-163-0x000000006FE40000-0x000000006FE8C000-memory.dmp
        Filesize

        304KB

      • memory/4412-162-0x00000000069E0000-0x0000000006A12000-memory.dmp
        Filesize

        200KB

      • memory/4412-150-0x0000000000000000-mapping.dmp
      • memory/4412-159-0x0000000006400000-0x000000000641E000-memory.dmp
        Filesize

        120KB

      • memory/4412-158-0x0000000005E20000-0x0000000005E86000-memory.dmp
        Filesize

        408KB

      • memory/4412-156-0x0000000005720000-0x0000000005D48000-memory.dmp
        Filesize

        6.2MB

      • memory/4412-151-0x0000000004F60000-0x0000000004F96000-memory.dmp
        Filesize

        216KB

      • memory/4576-178-0x0000000000000000-mapping.dmp
      • memory/4692-147-0x0000000000000000-mapping.dmp
      • memory/4864-152-0x0000000000000000-mapping.dmp
      • memory/4864-161-0x0000000006DE0000-0x0000000006DEA000-memory.dmp
        Filesize

        40KB

      • memory/4884-146-0x0000000000000000-mapping.dmp