Analysis

  • max time kernel
    198s
  • max time network
    207s
  • 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 17:51

General

  • Target

    Windows Remote Access Trojan.exe

  • Size

    3.1MB

  • MD5

    2c2172ccafa055a00312e4e3a08f229a

  • SHA1

    1c9dd30693318258d8ffd70984cb348d755c5d97

  • SHA256

    19b707de920bf77466108ba32a3d4b01fe051f46173db4bbf65c9e17895d9f55

  • SHA512

    ceecdee4cdb348a59f7b918b7c1d641e6ac398601493d87e1c91128387664effb457256cec427f71686cda808418003c8dc01ae9b22cb6ce76338237e5213225

  • SSDEEP

    49152:3vyI22SsaNYfdPBldt698dBcjHlqUMrtMfl5oGdBZTHHB72eh2NT:3vf22SsaNYfdPBldt6+dBcjHlrMrw

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

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Modifies registry class 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 2 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\Windows Remote Access Trojan.exe
    "C:\Users\Admin\AppData\Local\Temp\Windows Remote Access Trojan.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4720
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2844
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1148
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:4240
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:3612
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:4972

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      3.1MB

      MD5

      2c2172ccafa055a00312e4e3a08f229a

      SHA1

      1c9dd30693318258d8ffd70984cb348d755c5d97

      SHA256

      19b707de920bf77466108ba32a3d4b01fe051f46173db4bbf65c9e17895d9f55

      SHA512

      ceecdee4cdb348a59f7b918b7c1d641e6ac398601493d87e1c91128387664effb457256cec427f71686cda808418003c8dc01ae9b22cb6ce76338237e5213225

    • memory/1148-10-0x00007FFE5F740000-0x00007FFE60202000-memory.dmp

      Filesize

      10.8MB

    • memory/1148-11-0x000000001BD60000-0x000000001BD70000-memory.dmp

      Filesize

      64KB

    • memory/1148-12-0x000000001C9B0000-0x000000001CA00000-memory.dmp

      Filesize

      320KB

    • memory/1148-13-0x000000001CAC0000-0x000000001CB72000-memory.dmp

      Filesize

      712KB

    • memory/1148-14-0x00007FFE5F740000-0x00007FFE60202000-memory.dmp

      Filesize

      10.8MB

    • memory/1148-15-0x000000001BD60000-0x000000001BD70000-memory.dmp

      Filesize

      64KB

    • memory/4720-0-0x00000000006C0000-0x00000000009E4000-memory.dmp

      Filesize

      3.1MB

    • memory/4720-1-0x00007FFE5F740000-0x00007FFE60202000-memory.dmp

      Filesize

      10.8MB

    • memory/4720-2-0x000000001B700000-0x000000001B710000-memory.dmp

      Filesize

      64KB

    • memory/4720-9-0x00007FFE5F740000-0x00007FFE60202000-memory.dmp

      Filesize

      10.8MB