Analysis

  • max time kernel
    234s
  • max time network
    252s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18/08/2024, 21:19

General

  • Target

    Client-built.exe

  • Size

    3.3MB

  • MD5

    449c9192baa7503151f8bb30aa32153b

  • SHA1

    3906a9de42cb337d89e49542660f38144138d7ba

  • SHA256

    2d43f484fc7f954ecd5da337017ab2eb58c26ef39ec07e9bf5d53af63c9c4db8

  • SHA512

    c1fe393d34f2af903c755c9d18faeb71193ef6ceb285d1900c2b6df1798346f927367ab32c5b2de5f39e47b781f8a94224642effe2400323f7a0153a0c7fa624

  • SSDEEP

    49152:N6LFXL5Z8hlPKxXavYPBdjSx7sx+5I2jEyTHHB72eh2NT1:N6p5Z8hlPKxXavIXc7sx0ux

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

SKIDS

C2

147.185.221.22:6712

Mutex

9dcff5fc-a88b-409b-a00a-590c080de54a

Attributes
  • encryption_key

    36CF4D30A4E867DAD17ECBDA8EC17D90EA239A59

  • install_name

    Windows Host Process.exe

  • log_directory

    Windows-Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Host Process

  • subdirectory

    Windows

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • 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
  • Drops file in System32 directory 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Runs ping.exe 1 TTPs 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 FindShellTrayWindow 4 IoCs
  • Suspicious use of SendNotifyMessage 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 14 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⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1840
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4548
    • C:\Windows\system32\Windows\Windows Host Process.exe
      "C:\Windows\system32\Windows\Windows Host Process.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3980
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2356
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /delete /tn "Windows Host Process" /f
        3⤵
          PID:4208
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\bx6FdaD96gxH.bat" "
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:1192
          • C:\Windows\system32\chcp.com
            chcp 65001
            4⤵
              PID:2744
            • C:\Windows\system32\PING.EXE
              ping -n 10 localhost
              4⤵
              • System Network Configuration Discovery: Internet Connection Discovery
              • Runs ping.exe
              PID:4912
      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4280,i,10065386245627775856,6567048529106473151,262144 --variations-seed-version --mojo-platform-channel-handle=4316 /prefetch:8
        1⤵
          PID:4584

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Temp\bx6FdaD96gxH.bat

          Filesize

          215B

          MD5

          bceb5c01be57a249cb983921d8ab6409

          SHA1

          dc7e3b73f1712958968bddb9865cefa44b1e6678

          SHA256

          89596be1ef525b7a9db4104be661842177a9c9225b795d0efadbec6473dda978

          SHA512

          5b7a8a3ad63bafe5359f43e92394df997695e024c0cd97683a6d22d6ab6c0d222acb8465457a47d2f87c0ed3f011a150c4db03e9fb9cceecbb0d021a0972dbb5

        • C:\Windows\System32\Windows\Windows Host Process.exe

          Filesize

          3.3MB

          MD5

          449c9192baa7503151f8bb30aa32153b

          SHA1

          3906a9de42cb337d89e49542660f38144138d7ba

          SHA256

          2d43f484fc7f954ecd5da337017ab2eb58c26ef39ec07e9bf5d53af63c9c4db8

          SHA512

          c1fe393d34f2af903c755c9d18faeb71193ef6ceb285d1900c2b6df1798346f927367ab32c5b2de5f39e47b781f8a94224642effe2400323f7a0153a0c7fa624

        • memory/1840-0-0x00007FFAABA03000-0x00007FFAABA05000-memory.dmp

          Filesize

          8KB

        • memory/1840-1-0x0000000000D90000-0x00000000010E8000-memory.dmp

          Filesize

          3.3MB

        • memory/1840-2-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

          Filesize

          10.8MB

        • memory/1840-9-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

          Filesize

          10.8MB

        • memory/3980-11-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

          Filesize

          10.8MB

        • memory/3980-12-0x000000001B9E0000-0x000000001BA30000-memory.dmp

          Filesize

          320KB

        • memory/3980-13-0x000000001BAF0000-0x000000001BBA2000-memory.dmp

          Filesize

          712KB

        • memory/3980-16-0x000000001BA30000-0x000000001BA42000-memory.dmp

          Filesize

          72KB

        • memory/3980-17-0x000000001BA90000-0x000000001BACC000-memory.dmp

          Filesize

          240KB

        • memory/3980-18-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

          Filesize

          10.8MB

        • memory/3980-19-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

          Filesize

          10.8MB

        • memory/3980-24-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

          Filesize

          10.8MB

        • memory/3980-10-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

          Filesize

          10.8MB