Analysis

  • max time kernel
    145s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-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 7 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 7 IoCs
  • VenomRAT

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

  • Executes dropped EXE 4 IoCs
  • Deletes itself 1 IoCs
  • Loads dropped DLL 3 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). 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.

  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 54 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe
    "C:\Users\Admin\AppData\Local\Temp\b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:836
    • 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
      • Loads dropped DLL
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:984
      • 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
        • Loads dropped DLL
        • Windows security modification
        • Modifies system certificate store
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1468
        • 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:952
        • 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:704
          • 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:1084
            • 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:2012
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "powershell" Get-MpPreference -verbose
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1176
        • 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:944
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
            5⤵
            • Deletes itself
            PID:1712
        • C:\Windows\SysWOW64\cmd.exe
          cmd /c ""C:\Users\Admin\AppData\Local\Temp\KYTAbvvkUa3n.bat" "
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1508
          • C:\Windows\SysWOW64\chcp.com
            chcp 65001
            5⤵
              PID:1544

    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

    4
    T1112

    Disabling Security Tools

    2
    T1089

    Install Root Certificate

    1
    T1130

    Discovery

    System Information Discovery

    1
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • 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\KYTAbvvkUa3n.bat
      Filesize

      239B

      MD5

      92c5320bca10671f10dcdd8d6093a5b6

      SHA1

      bd14f3814623329a6c1d21900bac44d3eabf16b3

      SHA256

      02362a8b1ad99aead3b49735388a230fdbc901cc9adf425f0c7d7c38d4f1cd4f

      SHA512

      4462fae207beec626cd9b0d65804ed0f784139112ac7da6888979fc2f4df47ff37e5be3d4894f6cf75b535fb1bc509e32323a20be5b9b86ccc0b6f3d71e7f5b4

    • 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

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

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

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

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

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

      648KB

      MD5

      763dd9b7f2a5183a1380bee36889f936

      SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

      SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

      SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • memory/704-81-0x00000000011A0000-0x0000000001248000-memory.dmp
      Filesize

      672KB

    • memory/704-78-0x0000000000000000-mapping.dmp
    • memory/836-54-0x0000000075AD1000-0x0000000075AD3000-memory.dmp
      Filesize

      8KB

    • memory/944-100-0x0000000000000000-mapping.dmp
    • memory/952-76-0x0000000000000000-mapping.dmp
    • memory/984-59-0x0000000000F50000-0x0000000000FF8000-memory.dmp
      Filesize

      672KB

    • memory/984-61-0x00000000008B0000-0x00000000008BA000-memory.dmp
      Filesize

      40KB

    • memory/984-56-0x0000000000000000-mapping.dmp
    • memory/1084-88-0x0000000000486C4E-mapping.dmp
    • memory/1176-95-0x0000000000000000-mapping.dmp
    • memory/1176-98-0x000000006F110000-0x000000006F6BB000-memory.dmp
      Filesize

      5.7MB

    • memory/1176-99-0x000000006F110000-0x000000006F6BB000-memory.dmp
      Filesize

      5.7MB

    • memory/1468-63-0x0000000000400000-0x000000000048C000-memory.dmp
      Filesize

      560KB

    • memory/1468-74-0x0000000000400000-0x000000000048C000-memory.dmp
      Filesize

      560KB

    • memory/1468-72-0x0000000000400000-0x000000000048C000-memory.dmp
      Filesize

      560KB

    • memory/1468-69-0x0000000000486C4E-mapping.dmp
    • memory/1468-68-0x0000000000400000-0x000000000048C000-memory.dmp
      Filesize

      560KB

    • memory/1468-67-0x0000000000400000-0x000000000048C000-memory.dmp
      Filesize

      560KB

    • memory/1468-66-0x0000000000400000-0x000000000048C000-memory.dmp
      Filesize

      560KB

    • memory/1468-64-0x0000000000400000-0x000000000048C000-memory.dmp
      Filesize

      560KB

    • memory/1508-102-0x0000000000000000-mapping.dmp
    • memory/1544-104-0x0000000000000000-mapping.dmp
    • memory/1712-101-0x0000000000000000-mapping.dmp
    • memory/2012-97-0x0000000000000000-mapping.dmp