Analysis

  • max time kernel
    126s
  • max time network
    137s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    20-04-2024 17:57

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 3 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.

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 9 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:2192
    • 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:2160
    • 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:1996
      • 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:2716

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    2c2172ccafa055a00312e4e3a08f229a

    SHA1

    1c9dd30693318258d8ffd70984cb348d755c5d97

    SHA256

    19b707de920bf77466108ba32a3d4b01fe051f46173db4bbf65c9e17895d9f55

    SHA512

    ceecdee4cdb348a59f7b918b7c1d641e6ac398601493d87e1c91128387664effb457256cec427f71686cda808418003c8dc01ae9b22cb6ce76338237e5213225

  • memory/1996-9-0x000007FEF5950000-0x000007FEF633C000-memory.dmp

    Filesize

    9.9MB

  • memory/1996-8-0x0000000000E00000-0x0000000001124000-memory.dmp

    Filesize

    3.1MB

  • memory/1996-10-0x000000001B290000-0x000000001B310000-memory.dmp

    Filesize

    512KB

  • memory/1996-12-0x000007FEF5950000-0x000007FEF633C000-memory.dmp

    Filesize

    9.9MB

  • memory/1996-13-0x000000001B290000-0x000000001B310000-memory.dmp

    Filesize

    512KB

  • memory/2192-0-0x0000000000CC0000-0x0000000000FE4000-memory.dmp

    Filesize

    3.1MB

  • memory/2192-1-0x000007FEF5950000-0x000007FEF633C000-memory.dmp

    Filesize

    9.9MB

  • memory/2192-2-0x000000001B340000-0x000000001B3C0000-memory.dmp

    Filesize

    512KB

  • memory/2192-11-0x000007FEF5950000-0x000007FEF633C000-memory.dmp

    Filesize

    9.9MB