Analysis

  • max time kernel
    273s
  • max time network
    265s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240412-en
  • resource tags

    arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    20-04-2024 21:34

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    4d037c46eaf6b2e5ae5db85ef045c0d1

  • SHA1

    7bc3b6647192157a2cc4894f4c58365d9932a2cf

  • SHA256

    c18eadfdcee5050757e12c48fc44db31612863eb37db0fbc2dcbaad7ff5ae821

  • SHA512

    163d60321af8d3da76d10ea550b4c792dd0b6a18abe603ab049043246b2136fb2543f8089e3e5d3fbd6e6bfcf1786f4f7b8a96cb28e353cefbe1a2553e753ab3

  • SSDEEP

    49152:8vGlL26AaNeWgPhlmVqvMQ7XSKGSRJ6pbR3LoGd+THHB72eh2NTf:8vGL26AaNeWgPhlmVqkQ7XSKGSRJ6rP

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.154:4782

Mutex

ba502bba-c1c8-4a0b-95e6-4b1a3d5f551e

Attributes
  • encryption_key

    7195172212FD0C3E2300AE89FC3318C365A0CFF8

  • install_name

    window security.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    window security

  • subdirectory

    C:\Windows\System32

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 3 IoCs
  • Drops file in Windows 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-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2652
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "window security" /sc ONLOGON /tr "C:\Windows\System32\window security.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:4888
    • C:\Windows\System32\window security.exe
      "C:\Windows\System32\window security.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Drops file in Windows directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3968
      • C:\Windows\System32\schtasks.exe
        "schtasks" /create /tn "window security" /sc ONLOGON /tr "C:\Windows\System32\window security.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:3516

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\System32\window security.exe

    Filesize

    3.1MB

    MD5

    4d037c46eaf6b2e5ae5db85ef045c0d1

    SHA1

    7bc3b6647192157a2cc4894f4c58365d9932a2cf

    SHA256

    c18eadfdcee5050757e12c48fc44db31612863eb37db0fbc2dcbaad7ff5ae821

    SHA512

    163d60321af8d3da76d10ea550b4c792dd0b6a18abe603ab049043246b2136fb2543f8089e3e5d3fbd6e6bfcf1786f4f7b8a96cb28e353cefbe1a2553e753ab3

  • memory/2652-0-0x0000000000A50000-0x0000000000D78000-memory.dmp

    Filesize

    3.2MB

  • memory/2652-1-0x00007FF8E98D0000-0x00007FF8EA392000-memory.dmp

    Filesize

    10.8MB

  • memory/2652-2-0x000000001BA40000-0x000000001BA50000-memory.dmp

    Filesize

    64KB

  • memory/2652-9-0x00007FF8E98D0000-0x00007FF8EA392000-memory.dmp

    Filesize

    10.8MB

  • memory/3968-10-0x00007FF8E98D0000-0x00007FF8EA392000-memory.dmp

    Filesize

    10.8MB

  • memory/3968-11-0x000000001B560000-0x000000001B570000-memory.dmp

    Filesize

    64KB

  • memory/3968-12-0x000000001B2B0000-0x000000001B300000-memory.dmp

    Filesize

    320KB

  • memory/3968-13-0x000000001BC60000-0x000000001BD12000-memory.dmp

    Filesize

    712KB

  • memory/3968-14-0x00007FF8E98D0000-0x00007FF8EA392000-memory.dmp

    Filesize

    10.8MB

  • memory/3968-15-0x000000001B560000-0x000000001B570000-memory.dmp

    Filesize

    64KB