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Analysis

  • max time kernel
    138s
  • max time network
    143s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/12/2024, 19:10

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    d5f77af0c3259e8dfe5f630031ec4a34

  • SHA1

    97345887a00ae86149ffe649bb8b8210d3d89f29

  • SHA256

    9e17c6b9d15cd1ff039cd7aac08fe41a07522469a0b2cd9826b4695529d3594f

  • SHA512

    e93d86be4df1e3de06916d861f34817613c69890400136ae98bc9fc49bccf22caa69872e51f5f630584adbb6b0cfc364724c557c43161a887c98d0ee63eddd0c

  • SSDEEP

    49152:mvFt62XlaSFNWPjljiFa2RoUYIxixNESEHk/iHLoGdmTHHB72eh2NT:mv362XlaSFNWPjljiFXRoUYIAxCr

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

slave

C2

192.168.0.1:7680

Mutex

fe472357-144d-4a3a-8e1d-9ef513643cc1

Attributes
  • encryption_key

    5E806E3CE72868F0BCCBB7C901531979B646D78D

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    quasar

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 15 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of FindShellTrayWindow 27 IoCs
  • Suspicious use of SendNotifyMessage 27 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:3892
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "quasar" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:1128
    • 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 FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4756
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "quasar" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:1588
  • C:\Windows\system32\taskmgr.exe
    "C:\Windows\system32\taskmgr.exe" /7
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    PID:4668

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

    d5f77af0c3259e8dfe5f630031ec4a34

    SHA1

    97345887a00ae86149ffe649bb8b8210d3d89f29

    SHA256

    9e17c6b9d15cd1ff039cd7aac08fe41a07522469a0b2cd9826b4695529d3594f

    SHA512

    e93d86be4df1e3de06916d861f34817613c69890400136ae98bc9fc49bccf22caa69872e51f5f630584adbb6b0cfc364724c557c43161a887c98d0ee63eddd0c

  • memory/3892-0-0x00007FFF759D3000-0x00007FFF759D5000-memory.dmp

    Filesize

    8KB

  • memory/3892-1-0x00000000004B0000-0x00000000007D4000-memory.dmp

    Filesize

    3.1MB

  • memory/3892-2-0x00007FFF759D0000-0x00007FFF76491000-memory.dmp

    Filesize

    10.8MB

  • memory/3892-9-0x00007FFF759D0000-0x00007FFF76491000-memory.dmp

    Filesize

    10.8MB

  • memory/4668-21-0x0000020825FE0000-0x0000020825FE1000-memory.dmp

    Filesize

    4KB

  • memory/4668-27-0x0000020825FE0000-0x0000020825FE1000-memory.dmp

    Filesize

    4KB

  • memory/4668-22-0x0000020825FE0000-0x0000020825FE1000-memory.dmp

    Filesize

    4KB

  • memory/4668-24-0x0000020825FE0000-0x0000020825FE1000-memory.dmp

    Filesize

    4KB

  • memory/4668-25-0x0000020825FE0000-0x0000020825FE1000-memory.dmp

    Filesize

    4KB

  • memory/4668-26-0x0000020825FE0000-0x0000020825FE1000-memory.dmp

    Filesize

    4KB

  • memory/4668-15-0x0000020825FE0000-0x0000020825FE1000-memory.dmp

    Filesize

    4KB

  • memory/4668-16-0x0000020825FE0000-0x0000020825FE1000-memory.dmp

    Filesize

    4KB

  • memory/4668-17-0x0000020825FE0000-0x0000020825FE1000-memory.dmp

    Filesize

    4KB

  • memory/4668-23-0x0000020825FE0000-0x0000020825FE1000-memory.dmp

    Filesize

    4KB

  • memory/4756-8-0x00007FFF759D0000-0x00007FFF76491000-memory.dmp

    Filesize

    10.8MB

  • memory/4756-14-0x000000001CDC0000-0x000000001D2E8000-memory.dmp

    Filesize

    5.2MB

  • memory/4756-13-0x00007FFF759D0000-0x00007FFF76491000-memory.dmp

    Filesize

    10.8MB

  • memory/4756-12-0x000000001C490000-0x000000001C542000-memory.dmp

    Filesize

    712KB

  • memory/4756-11-0x000000001C380000-0x000000001C3D0000-memory.dmp

    Filesize

    320KB

  • memory/4756-10-0x00007FFF759D0000-0x00007FFF76491000-memory.dmp

    Filesize

    10.8MB