Overview

overview

10

Static

static

10

s.exe

windows7-x64

10

s.exe

windows10-2004-x64

Analysis

  • max time kernel
    93s
  • max time network
    94s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250129-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250129-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-01-2025 08:43

Sharing

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Errors

Reason
Machine shutdown
Report Analysis Logs

General

  • Target

    s.exe

  • Size

    3.1MB

  • MD5

    c710a6667ea3c649ee266a981893440d

  • SHA1

    064314508d0579b471c568741ce170f1d6ce61d3

  • SHA256

    1ea872be9eeda2c5637a2f53b1121e88417bf0bff95fc12a2aeee9c48f0664e3

  • SHA512

    f9cc489459127a011f4e883f53d20c146d1ee2410e77b0c767162b11e42d2c3b19fb7fb40df841ce6c18bc3f3ad1b453de7692abaa69db71373c5a953fd31fe6

  • SSDEEP

    49152:bvTlL26AaNeWgPhlmVqvMQ7XSK2ixNESEXk/idLoGdSTHHB72eh2NT:bvJL26AaNeWgPhlmVqkQ7XSKfxeV

Score
10/10
quasaroffice04spywarestealertrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

per-cassette.gl.at.ply.gg:41388

Mutex

96621e5e-be82-4575-8b94-bb078b016935

Attributes
  • encryption_key

    8372309E4F7DFDD0DD443E979B8B9374D4F2B48F

  • 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.

    trojanspywarequasar
  • Quasar family
    quasar
  • Quasar payload 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Reads WinSCP keys stored on the system 2 TTPs

    Tries to access WinSCP stored sessions.

    spywarestealer
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

    spywarestealer
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies data under HKEY_USERS 15 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

    persistenceexecution
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of FindShellTrayWindow 3 IoCs
  • Suspicious use of SendNotifyMessage 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 8 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.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\s.exe
    "C:\Users\Admin\AppData\Local\Temp\s.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3672
    • 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:3480
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:824
      • 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:2428
      • C:\Windows\System32\shutdown.exe
        "C:\Windows\System32\shutdown.exe" /s /t 0
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1860
  • C:\Windows\system32\LogonUI.exe
    "LogonUI.exe" /flags:0x4 /state0:0xa38c7855 /state1:0x41c64e6d
    1⤵
    • Modifies data under HKEY_USERS
    • Suspicious use of SetWindowsHookEx
    PID:1976

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

    c710a6667ea3c649ee266a981893440d

    SHA1

    064314508d0579b471c568741ce170f1d6ce61d3

    SHA256

    1ea872be9eeda2c5637a2f53b1121e88417bf0bff95fc12a2aeee9c48f0664e3

    SHA512

    f9cc489459127a011f4e883f53d20c146d1ee2410e77b0c767162b11e42d2c3b19fb7fb40df841ce6c18bc3f3ad1b453de7692abaa69db71373c5a953fd31fe6

    Download Submit

  • memory/824-11-0x00007FF9E7920000-0x00007FF9E83E1000-memory.dmp

    Filesize

    10.8MB

    Download

  • memory/824-10-0x00007FF9E7920000-0x00007FF9E83E1000-memory.dmp

    Filesize

    10.8MB

    Download

  • memory/824-12-0x000000001C1A0000-0x000000001C1F0000-memory.dmp

    Filesize

    320KB

    Download

  • memory/824-13-0x000000001C2B0000-0x000000001C362000-memory.dmp

    Filesize

    712KB

    Download

  • memory/824-14-0x000000001C170000-0x000000001C182000-memory.dmp

    Filesize

    72KB

    Download

  • memory/824-15-0x000000001C230000-0x000000001C26C000-memory.dmp

    Filesize

    240KB

    Download

  • memory/824-16-0x00007FF9E7920000-0x00007FF9E83E1000-memory.dmp

    Filesize

    10.8MB

    Download

  • memory/824-17-0x00007FF9E7920000-0x00007FF9E83E1000-memory.dmp

    Filesize

    10.8MB

    Download

  • memory/3672-2-0x00007FF9E7920000-0x00007FF9E83E1000-memory.dmp

    Filesize

    10.8MB

    Download

  • memory/3672-1-0x0000000000CF0000-0x0000000001014000-memory.dmp

    Filesize

    3.1MB

    Download

  • memory/3672-9-0x00007FF9E7920000-0x00007FF9E83E1000-memory.dmp

    Filesize

    10.8MB

    Download

  • memory/3672-0-0x00007FF9E7923000-0x00007FF9E7925000-memory.dmp

    Filesize

    8KB

    Download