Analysis

  • max time kernel
    1383s
  • max time network
    1172s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240508-en
  • resource tags

    arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    25-05-2024 01:25

General

  • Target

    client.exe

  • Size

    3.1MB

  • MD5

    4dfff8420e0d2f3a0e30a3ae8e005830

  • SHA1

    379546834fa347bdcf6a4aa1a9d956b540d33b55

  • SHA256

    7869d203ee2ffc4d75d4d542cc2e3a970ca249d675e8bc7bd4f9cc85c80cab69

  • SHA512

    6f4de859019a9ed236f6ddcbb03737c9e643368ae74fea3b36f7254a1b691448fb5f5befe4997554ed96f099309908f6b0a42d46161d3727d07620b1ecca94cb

  • SSDEEP

    49152:2vBt62XlaSFNWPjljiFa2RoUYIlQcMbKLoGdFewTHHB72eh2NT:2vr62XlaSFNWPjljiFXRoUYIlQcM2

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

watchdog

C2

142.115.43.39:8080

Mutex

1c1f3ace-a14c-4361-99eb-65aedb6d50fd

Attributes
  • encryption_key

    3FAEE4D5FC9BC245D4CA5F4165EAFD34E8D5FE16

  • install_name

    watchdog.exe

  • log_directory

    logs

  • reconnect_delay

    3000

  • startup_key

    watchdog

  • subdirectory

    drivers

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Drops file in Drivers directory 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 21 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • 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 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 14 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\client.exe
    "C:\Users\Admin\AppData\Local\Temp\client.exe"
    1⤵
    • Drops file in Drivers directory
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4380
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "watchdog" /sc ONLOGON /tr "C:\Windows\system32\drivers\watchdog.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:1392
    • C:\Windows\system32\drivers\watchdog.exe
      "C:\Windows\system32\drivers\watchdog.exe"
      2⤵
      • Drops file in Drivers directory
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4524
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "watchdog" /sc ONLOGON /tr "C:\Windows\system32\drivers\watchdog.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:2616
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /delete /tn "watchdog" /f
        3⤵
          PID:2464
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\CSz9IKETpQUc.bat" "
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:2992
          • C:\Windows\system32\chcp.com
            chcp 65001
            4⤵
              PID:3044
            • C:\Windows\system32\PING.EXE
              ping -n 10 localhost
              4⤵
              • Runs ping.exe
              PID:1040
      • C:\Windows\System32\svchost.exe
        C:\Windows\System32\svchost.exe -k LocalServiceNetworkRestricted -p -s EventLog
        1⤵
        • Drops file in System32 directory
        • Drops file in Windows directory
        • Checks processor information in registry
        PID:1104
      • C:\Windows\system32\svchost.exe
        C:\Windows\system32\svchost.exe -k osprivacy -p -s camsvc
        1⤵
          PID:3240

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Temp\CSz9IKETpQUc.bat

          Filesize

          203B

          MD5

          786250ed1b549ef81c2ae3ec0e66e4b7

          SHA1

          9e9d5114974b5addf50b1ce29cf43f4d7dbc34c1

          SHA256

          03b7026273b556cdddcf25c6b35a3e78a4f9c7bc654681a5a744ac3eb9165c05

          SHA512

          8a68f0b069abe6e8deb9d2d43e7e0c864c80bacc5582a5577b2cbc42c091d90ce832fbb8ac7ae9727945888efad0ff2b8762e33b4b67103c8e3ec8ce1f9e31b8

        • C:\Windows\System32\drivers\watchdog.exe

          Filesize

          3.1MB

          MD5

          4dfff8420e0d2f3a0e30a3ae8e005830

          SHA1

          379546834fa347bdcf6a4aa1a9d956b540d33b55

          SHA256

          7869d203ee2ffc4d75d4d542cc2e3a970ca249d675e8bc7bd4f9cc85c80cab69

          SHA512

          6f4de859019a9ed236f6ddcbb03737c9e643368ae74fea3b36f7254a1b691448fb5f5befe4997554ed96f099309908f6b0a42d46161d3727d07620b1ecca94cb

        • memory/4380-0-0x00007FFB728F3000-0x00007FFB728F5000-memory.dmp

          Filesize

          8KB

        • memory/4380-1-0x0000000000D20000-0x0000000001044000-memory.dmp

          Filesize

          3.1MB

        • memory/4380-2-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

          Filesize

          10.8MB

        • memory/4380-9-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

          Filesize

          10.8MB

        • memory/4524-11-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

          Filesize

          10.8MB

        • memory/4524-12-0x000000001B860000-0x000000001B8B0000-memory.dmp

          Filesize

          320KB

        • memory/4524-13-0x000000001B970000-0x000000001BA22000-memory.dmp

          Filesize

          712KB

        • memory/4524-14-0x000000001B8D0000-0x000000001B8E2000-memory.dmp

          Filesize

          72KB

        • memory/4524-15-0x000000001B930000-0x000000001B96C000-memory.dmp

          Filesize

          240KB

        • memory/4524-16-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

          Filesize

          10.8MB

        • memory/4524-22-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

          Filesize

          10.8MB

        • memory/4524-10-0x00007FFB728F0000-0x00007FFB733B2000-memory.dmp

          Filesize

          10.8MB