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Resubmissions

07/08/2024, 00:14

240807-ajameavelq 10

07/08/2024, 00:10

240807-agetcaycqd 10

Analysis

  • max time kernel
    125s
  • max time network
    143s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07/08/2024, 00:14

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    6f2f7543e46ca0cd1eecf947d68b0ec8

  • SHA1

    7cf099fee562af351bebcea654e660fb05a5e736

  • SHA256

    4d9417d9d1f8779020682a3882dc72979a504ea9b71ef51b37084556aa0d7205

  • SHA512

    5851ea5dc7f9160256fb28fb89784fbbe40e244b55f083175382464eafa6c39d8b0c88aead34812c7c9f1abb6ccc1db84f65d379b4e1e6b65f65dc1a1902117c

  • SSDEEP

    49152:ivyI22SsaNYfdPBldt698dBcjHh/RJ6EbR3LoGdf41THHB72eh2NT:ivf22SsaNYfdPBldt6+dBcjHh/RJ6O

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.85:4782

Mutex

d31c90bf-6e6a-483d-9f59-e618a1e6c7c9

Attributes
  • encryption_key

    705FA42F7E103298DD84CEB0EA11F1B6B9143152

  • 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
  • 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3996
    • 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:2652
    • 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:1240
      • 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:4048

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

    6f2f7543e46ca0cd1eecf947d68b0ec8

    SHA1

    7cf099fee562af351bebcea654e660fb05a5e736

    SHA256

    4d9417d9d1f8779020682a3882dc72979a504ea9b71ef51b37084556aa0d7205

    SHA512

    5851ea5dc7f9160256fb28fb89784fbbe40e244b55f083175382464eafa6c39d8b0c88aead34812c7c9f1abb6ccc1db84f65d379b4e1e6b65f65dc1a1902117c

  • memory/1240-10-0x00007FF8FF570000-0x00007FF900031000-memory.dmp

    Filesize

    10.8MB

  • memory/1240-11-0x00007FF8FF570000-0x00007FF900031000-memory.dmp

    Filesize

    10.8MB

  • memory/1240-12-0x000000001B210000-0x000000001B260000-memory.dmp

    Filesize

    320KB

  • memory/1240-13-0x000000001BA50000-0x000000001BB02000-memory.dmp

    Filesize

    712KB

  • memory/1240-14-0x00007FF8FF570000-0x00007FF900031000-memory.dmp

    Filesize

    10.8MB

  • memory/3996-0-0x00007FF8FF573000-0x00007FF8FF575000-memory.dmp

    Filesize

    8KB

  • memory/3996-1-0x00000000007C0000-0x0000000000AE4000-memory.dmp

    Filesize

    3.1MB

  • memory/3996-2-0x00007FF8FF570000-0x00007FF900031000-memory.dmp

    Filesize

    10.8MB

  • memory/3996-9-0x00007FF8FF570000-0x00007FF900031000-memory.dmp

    Filesize

    10.8MB