Analysis

  • max time kernel
    596s
  • max time network
    598s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-fr
  • resource tags

    arch:x64arch:x86image:win11-20241007-frlocale:fr-fros:windows11-21h2-x64systemwindows
  • submitted
    04-01-2025 09:53

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    00213fcafbc3094166240f85a2113a48

  • SHA1

    bca3cb12ffc1deecaa48e75fd044d12bbbfdc7be

  • SHA256

    f84484392271761f6894d474af57c959f72b40bf0afbd3ff00c34d9aaadd49f6

  • SHA512

    b048cc823268d731b0b35600723cb4a58fa108f1ef48f1ebad7b522a6c8656c981e363d5a908403b1ef20909d2624c325d22df2143774190b12f5fcb3741fa10

  • SSDEEP

    49152:rvmI22SsaNYfdPBldt698dBcjHGCW1JbLoGd4THHB72eh2NT:rvr22SsaNYfdPBldt6+dBcjHGCi

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.46:4782

Mutex

f6997eed-21d3-4b8e-b10b-56ea04111c63

Attributes
  • encryption_key

    7E7C408B51CEDDF4082BCC64D506AE67B3B3044D

  • 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 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 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:4900
    • 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:1136
    • 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 WriteProcessMemory
      PID:2012
      • 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:1336
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc
    1⤵
      PID:4888

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      3.1MB

      MD5

      00213fcafbc3094166240f85a2113a48

      SHA1

      bca3cb12ffc1deecaa48e75fd044d12bbbfdc7be

      SHA256

      f84484392271761f6894d474af57c959f72b40bf0afbd3ff00c34d9aaadd49f6

      SHA512

      b048cc823268d731b0b35600723cb4a58fa108f1ef48f1ebad7b522a6c8656c981e363d5a908403b1ef20909d2624c325d22df2143774190b12f5fcb3741fa10

    • memory/2012-11-0x00007FFA13DA0000-0x00007FFA14862000-memory.dmp

      Filesize

      10.8MB

    • memory/2012-10-0x00007FFA13DA0000-0x00007FFA14862000-memory.dmp

      Filesize

      10.8MB

    • memory/2012-12-0x000000001BEC0000-0x000000001BF10000-memory.dmp

      Filesize

      320KB

    • memory/2012-13-0x000000001C7A0000-0x000000001C852000-memory.dmp

      Filesize

      712KB

    • memory/2012-14-0x000000001C080000-0x000000001C0C2000-memory.dmp

      Filesize

      264KB

    • memory/2012-15-0x000000001CCF0000-0x000000001CDF2000-memory.dmp

      Filesize

      1.0MB

    • memory/2012-16-0x00007FFA13DA0000-0x00007FFA14862000-memory.dmp

      Filesize

      10.8MB

    • memory/2012-17-0x00007FFA13DA0000-0x00007FFA14862000-memory.dmp

      Filesize

      10.8MB

    • memory/4900-2-0x00007FFA13DA0000-0x00007FFA14862000-memory.dmp

      Filesize

      10.8MB

    • memory/4900-1-0x0000000000630000-0x0000000000954000-memory.dmp

      Filesize

      3.1MB

    • memory/4900-9-0x00007FFA13DA0000-0x00007FFA14862000-memory.dmp

      Filesize

      10.8MB

    • memory/4900-0-0x00007FFA13DA3000-0x00007FFA13DA5000-memory.dmp

      Filesize

      8KB