Analysis

  • max time kernel
    1794s
  • max time network
    1799s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240426-en
  • resource tags

    arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    25-05-2024 01:23

General

  • Target

    client.exe

  • Size

    3.1MB

  • MD5

    3923567323be44b3a3955f8b69585396

  • SHA1

    c2db51125c1d664ac02e9ea28fbe4fb6fc47e59a

  • SHA256

    f6fe8fbbafb40ded2572c45d74740d6aa5a7bd6149e2ec2ddedf9030b7411228

  • SHA512

    5d410bfeb594674195c46dbd228c4967e5df07bd3b6fe3d16a8be48690d58354d4448e35b9fc7a99bca720ed104d6e24be8fd8d8abc31392ccd55a556da14dca

  • SSDEEP

    49152:KvBt62XlaSFNWPjljiFa2RoUYIx8pnrTFvJKuoGdNTHHB72eh2NT:Kvr62XlaSFNWPjljiFXRoUYI6Tl

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

watchdog

C2

142.115.43.143:8080

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 2 IoCs
  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 6 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:3312
    • 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:3356
    • 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 use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3268
      • 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:2220

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    3923567323be44b3a3955f8b69585396

    SHA1

    c2db51125c1d664ac02e9ea28fbe4fb6fc47e59a

    SHA256

    f6fe8fbbafb40ded2572c45d74740d6aa5a7bd6149e2ec2ddedf9030b7411228

    SHA512

    5d410bfeb594674195c46dbd228c4967e5df07bd3b6fe3d16a8be48690d58354d4448e35b9fc7a99bca720ed104d6e24be8fd8d8abc31392ccd55a556da14dca

  • memory/3268-9-0x00007FFAF1660000-0x00007FFAF2122000-memory.dmp

    Filesize

    10.8MB

  • memory/3268-11-0x00007FFAF1660000-0x00007FFAF2122000-memory.dmp

    Filesize

    10.8MB

  • memory/3268-12-0x000000001BA00000-0x000000001BA50000-memory.dmp

    Filesize

    320KB

  • memory/3268-13-0x000000001BB10000-0x000000001BBC2000-memory.dmp

    Filesize

    712KB

  • memory/3268-14-0x00007FFAF1660000-0x00007FFAF2122000-memory.dmp

    Filesize

    10.8MB

  • memory/3312-0-0x00007FFAF1663000-0x00007FFAF1665000-memory.dmp

    Filesize

    8KB

  • memory/3312-1-0x0000000000910000-0x0000000000C34000-memory.dmp

    Filesize

    3.1MB

  • memory/3312-2-0x00007FFAF1660000-0x00007FFAF2122000-memory.dmp

    Filesize

    10.8MB

  • memory/3312-10-0x00007FFAF1660000-0x00007FFAF2122000-memory.dmp

    Filesize

    10.8MB