Analysis

  • max time kernel
    200s
  • max time network
    219s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    12-05-2022 15:47

General

  • Target

    19f0abf0648c4c993b02b50b4e35224b64ff45b9748dd9dc36c68cf1b42dcbdd.exe

  • Size

    610KB

  • MD5

    783dde94a3c4fdad4663bc9e370e9de8

  • SHA1

    262fa6fe51d779ae988d6b99ac8ee37d71c75064

  • SHA256

    19f0abf0648c4c993b02b50b4e35224b64ff45b9748dd9dc36c68cf1b42dcbdd

  • SHA512

    a41f2f23272e55d9b275f868439758618f96c30fe47fd433431b07322f135fcbba3c43be199aba86160abe5e362e44ce9aa862bbf48cd0a33b716b278ec565b8

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

svhost

C2

myconect.ddns.net:6606

Mutex

VNM_MUTEX_rHOHbrAQKctPD4d68w

Attributes
  • encryption_key

    rDFwhCyuKMqXO7llDpB2

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Venom Client Startup

  • subdirectory

    SubDir

Signatures

  • Contains code to disable Windows Defender 10 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 10 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 3 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 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.

  • 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
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 44 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\19f0abf0648c4c993b02b50b4e35224b64ff45b9748dd9dc36c68cf1b42dcbdd.exe
    "C:\Users\Admin\AppData\Local\Temp\19f0abf0648c4c993b02b50b4e35224b64ff45b9748dd9dc36c68cf1b42dcbdd.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1416
    • C:\Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe
      "C:\Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Windows security modification
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1168
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Venom Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:524
      • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
        "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
        3⤵
        • Executes dropped EXE
        • Adds Run key to start application
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:1636
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks" /create /tn "Venom Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
          4⤵
          • Creates scheduled task(s)
          PID:1692
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "powershell" Get-MpPreference -verbose
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1708
      • 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:1188
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
          4⤵
          • Deletes itself
          PID:428
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\Users\Admin\AppData\Local\Temp\5n2ZuncUUeIt.bat" "
        3⤵
        • Loads dropped DLL
        • Suspicious use of WriteProcessMemory
        PID:1976
        • C:\Windows\SysWOW64\chcp.com
          chcp 65001
          4⤵
            PID:1064
          • C:\Windows\SysWOW64\PING.EXE
            ping -n 10 localhost
            4⤵
            • Runs ping.exe
            PID:1216
          • C:\Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe
            "C:\Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe"
            4⤵
            • Executes dropped EXE
            PID:756
    • C:\Windows\SysWOW64\DllHost.exe
      C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}
      1⤵
      • Suspicious use of FindShellTrayWindow
      PID:880

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\5n2ZuncUUeIt.bat

      Filesize

      207B

      MD5

      f8f6df614c64ecb3f9dce5e9de562b4f

      SHA1

      102abca916bca7f4f02e374db9198c58d15e9ab3

      SHA256

      0a79ccb24f4cd75aaf55cc44bec96afb296140ea449fbd053b89d7acd3779d83

      SHA512

      e3101e26ec61826f7a19a05f8e1462bb9cdf3b8f8c9e4e6725cfa3f735457a4e08f3309b21d4d42981d217578dfcfb8d2ea97b254800303eb0a2b66a079cf52e

    • C:\Users\Admin\AppData\Local\Temp\Joqnjogev.jpg

      Filesize

      72KB

      MD5

      277f0e029298e0dffee3f8820726c6e3

      SHA1

      df2cdaa12ccc9e0eb0de1871c9fa12cec9f575a2

      SHA256

      f7ede3780d2e6789dfd5aaf99d8613040e6150f44ab547116817dc2f7ad442a8

      SHA512

      b2fc83d2e4d682007109be8b33aff144af3ad8f6466b911c6f48516fde5530234ed964d12a82e1e10a4a79130ee59fdc2076106d4f7460e036cdd0454da90272

    • C:\Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe

      Filesize

      655KB

      MD5

      43e5556cab3ba9cd353b0c6cf1548d75

      SHA1

      64cf51c0d612cb6276e59639071406c1d2e86702

      SHA256

      286ea33997e28cad2651bc27c091e45c3502c4c7f69e4f28965bf846cf9528b8

      SHA512

      edde4a5af40e65afbe4e212e356879277f9641e4b8d46950fed33397754fe87ff81a337623e6c5202776e1636cefcd58f0ed94a212e8dd25ba427a017fcb2bdf

    • C:\Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe

      Filesize

      655KB

      MD5

      43e5556cab3ba9cd353b0c6cf1548d75

      SHA1

      64cf51c0d612cb6276e59639071406c1d2e86702

      SHA256

      286ea33997e28cad2651bc27c091e45c3502c4c7f69e4f28965bf846cf9528b8

      SHA512

      edde4a5af40e65afbe4e212e356879277f9641e4b8d46950fed33397754fe87ff81a337623e6c5202776e1636cefcd58f0ed94a212e8dd25ba427a017fcb2bdf

    • C:\Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe

      Filesize

      526KB

      MD5

      f2289426aed1178a239226474524eac5

      SHA1

      1c60e6d699cb6016a57875a577f1d7ff6114f0c8

      SHA256

      bbf9eb424c58cce104b194cf75dbbfb4f33c22392ca17abbf03d06c2675eb941

      SHA512

      b5c0f67c5e78dfd52883c7418e317075b6fdfdb798aac02e0051a1b27fde527503d96044868c0d9399d651479e23135745a900f60f90d96750dcd41f70275867

    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

      Filesize

      655KB

      MD5

      43e5556cab3ba9cd353b0c6cf1548d75

      SHA1

      64cf51c0d612cb6276e59639071406c1d2e86702

      SHA256

      286ea33997e28cad2651bc27c091e45c3502c4c7f69e4f28965bf846cf9528b8

      SHA512

      edde4a5af40e65afbe4e212e356879277f9641e4b8d46950fed33397754fe87ff81a337623e6c5202776e1636cefcd58f0ed94a212e8dd25ba427a017fcb2bdf

    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

      Filesize

      655KB

      MD5

      43e5556cab3ba9cd353b0c6cf1548d75

      SHA1

      64cf51c0d612cb6276e59639071406c1d2e86702

      SHA256

      286ea33997e28cad2651bc27c091e45c3502c4c7f69e4f28965bf846cf9528b8

      SHA512

      edde4a5af40e65afbe4e212e356879277f9641e4b8d46950fed33397754fe87ff81a337623e6c5202776e1636cefcd58f0ed94a212e8dd25ba427a017fcb2bdf

    • \Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe

      Filesize

      655KB

      MD5

      43e5556cab3ba9cd353b0c6cf1548d75

      SHA1

      64cf51c0d612cb6276e59639071406c1d2e86702

      SHA256

      286ea33997e28cad2651bc27c091e45c3502c4c7f69e4f28965bf846cf9528b8

      SHA512

      edde4a5af40e65afbe4e212e356879277f9641e4b8d46950fed33397754fe87ff81a337623e6c5202776e1636cefcd58f0ed94a212e8dd25ba427a017fcb2bdf

    • \Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe

      Filesize

      477KB

      MD5

      96d21b43b0db6c701dd6c9080d15ecf0

      SHA1

      1f1c7460438e15f426f48713a314cdaaf6427e5a

      SHA256

      8074f918596359316353060f3bfd8bc9b2b319e527f643bfb5bd56527cafc065

      SHA512

      c314c5ce1851d8e5a26fe7849f197459bdd3b36f29375a9b5845c2c0a6a949478699ac5fbe56b0c2489fe6a176bb7891852f22e9530f50bcdc1278ce17a7e1ef

    • \Users\Admin\AppData\Roaming\SubDir\Client.exe

      Filesize

      655KB

      MD5

      43e5556cab3ba9cd353b0c6cf1548d75

      SHA1

      64cf51c0d612cb6276e59639071406c1d2e86702

      SHA256

      286ea33997e28cad2651bc27c091e45c3502c4c7f69e4f28965bf846cf9528b8

      SHA512

      edde4a5af40e65afbe4e212e356879277f9641e4b8d46950fed33397754fe87ff81a337623e6c5202776e1636cefcd58f0ed94a212e8dd25ba427a017fcb2bdf

    • memory/428-76-0x0000000000000000-mapping.dmp

    • memory/524-64-0x0000000000000000-mapping.dmp

    • memory/756-82-0x0000000000000000-mapping.dmp

    • memory/756-84-0x00000000009E0000-0x0000000000A8A000-memory.dmp

      Filesize

      680KB

    • memory/1064-79-0x0000000000000000-mapping.dmp

    • memory/1168-60-0x0000000000980000-0x0000000000A2A000-memory.dmp

      Filesize

      680KB

    • memory/1168-57-0x0000000000000000-mapping.dmp

    • memory/1188-75-0x0000000000000000-mapping.dmp

    • memory/1216-80-0x0000000000000000-mapping.dmp

    • memory/1416-54-0x0000000000400000-0x000000000049E000-memory.dmp

      Filesize

      632KB

    • memory/1416-55-0x0000000075BF1000-0x0000000075BF3000-memory.dmp

      Filesize

      8KB

    • memory/1636-70-0x0000000000930000-0x00000000009DA000-memory.dmp

      Filesize

      680KB

    • memory/1636-66-0x0000000000000000-mapping.dmp

    • memory/1692-73-0x0000000000000000-mapping.dmp

    • memory/1708-74-0x000000006EFE0000-0x000000006F58B000-memory.dmp

      Filesize

      5.7MB

    • memory/1708-69-0x0000000000000000-mapping.dmp

    • memory/1976-77-0x0000000000000000-mapping.dmp