Analysis

  • max time kernel
    2s
  • max time network
    6s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    23-01-2025 04:10

General

  • Target

    STAR HOOK.exe

  • Size

    3.1MB

  • MD5

    e05108dad2df0d077c02297b720bd7aa

  • SHA1

    5f86c17a4287fad6c8d4339c97bcca1549ae9d96

  • SHA256

    8887b67a5cf1e1e975a9b37c77509652e475607e02c5d744ab2b843edc84cc5a

  • SHA512

    9953ac0465609e19674cac51f67ec69d25e8b9500995cb1b93c46bdd8bfda0519ddfb40ace36575435f65b5d63dbc5eebe743d6855943e43cf79975a9258cf3f

  • SSDEEP

    49152:rvyI22SsaNYfdPBldt698dBcjHyrjGgJ8QoGdQTHHB72eh2NT:rvf22SsaNYfdPBldt6+dBcjHyrfJF

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.12.223:4782

Mutex

9ff7b014-19b2-444b-95dd-ac9edadfe699

Attributes
  • encryption_key

    39B0A38C739CA03F425D52D6DB813486CCB3B858

  • install_name

    Client.exe

  • log_directory

    HITS FOR QUASAR

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Scheduled Task/Job: Scheduled Task 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\STAR HOOK.exe
    "C:\Users\Admin\AppData\Local\Temp\STAR HOOK.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:560
    • 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⤵
      • Scheduled Task/Job: Scheduled Task
      PID:5116
    • 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:4216
      • 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⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2512

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

    e05108dad2df0d077c02297b720bd7aa

    SHA1

    5f86c17a4287fad6c8d4339c97bcca1549ae9d96

    SHA256

    8887b67a5cf1e1e975a9b37c77509652e475607e02c5d744ab2b843edc84cc5a

    SHA512

    9953ac0465609e19674cac51f67ec69d25e8b9500995cb1b93c46bdd8bfda0519ddfb40ace36575435f65b5d63dbc5eebe743d6855943e43cf79975a9258cf3f

  • memory/560-0-0x00007FFE9D993000-0x00007FFE9D995000-memory.dmp

    Filesize

    8KB

  • memory/560-1-0x0000000000DD0000-0x00000000010F4000-memory.dmp

    Filesize

    3.1MB

  • memory/560-2-0x00007FFE9D990000-0x00007FFE9E452000-memory.dmp

    Filesize

    10.8MB

  • memory/560-9-0x00007FFE9D990000-0x00007FFE9E452000-memory.dmp

    Filesize

    10.8MB

  • memory/4216-10-0x00007FFE9D990000-0x00007FFE9E452000-memory.dmp

    Filesize

    10.8MB

  • memory/4216-11-0x00007FFE9D990000-0x00007FFE9E452000-memory.dmp

    Filesize

    10.8MB

  • memory/4216-12-0x0000000002E40000-0x0000000002E90000-memory.dmp

    Filesize

    320KB

  • memory/4216-13-0x000000001C450000-0x000000001C502000-memory.dmp

    Filesize

    712KB