Analysis

  • max time kernel
    435s
  • max time network
    436s
  • 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, 21:25

General

  • Target

    Client-built.exe

  • Size

    3.3MB

  • MD5

    9eb8732b560208f0380c386771aba096

  • SHA1

    d2ae1ff6755e79f97485aea27912ed7710378b08

  • SHA256

    d00477c11f3c8ad73a0ea9c3c4b7e549754ed63b645a3a8f57de6dd2f89ec8d0

  • SHA512

    686b1968a19d6f81562df6efd659060ecc7d2eceb7b053d530e8bcba030db6e7b55cb7c6364d6dddc7ea9a46b5004cae3a78db5b432ed279ce2fa854fa400b8a

  • SSDEEP

    49152:B6LFXL5Z8hlPKxXavF01l+5I2jPTHHB72eh2NT1:B6p5Z8hlPKxXavFkl0M

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

    5678253D7FFD68D83D55A584486F1015D2B1BC30

  • 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
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • 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 Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

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

    Adversaries may check for Internet connectivity on compromised systems.

  • Modifies Internet Explorer settings 1 TTPs 2 IoCs
  • Modifies registry class 5 IoCs
  • 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 behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 13 IoCs
  • Suspicious use of SendNotifyMessage 13 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 16 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:5080
    • 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:1368
    • 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:3896
      • 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:4968
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" -Command "Add-MpPreference -ExclusionPath 'C:\'"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1912
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /delete /tn "Windows Host Process" /f
        3⤵
          PID:1488
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\uCTdtSDvidJt.bat" "
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:4604
          • C:\Windows\system32\chcp.com
            chcp 65001
            4⤵
              PID:1520
            • C:\Windows\system32\PING.EXE
              ping -n 10 localhost
              4⤵
              • System Network Configuration Discovery: Internet Connection Discovery
              • Runs ping.exe
              PID:1360
      • C:\Windows\SysWOW64\DllHost.exe
        C:\Windows\SysWOW64\DllHost.exe /Processid:{06622D85-6856-4460-8DE1-A81921B41C4B}
        1⤵
        • System Location Discovery: System Language Discovery
        PID:840
      • C:\Windows\explorer.exe
        C:\Windows\explorer.exe /factory,{5BD95610-9434-43C2-886C-57852CC8A120} -Embedding
        1⤵
        • Modifies Internet Explorer settings
        • Modifies registry class
        PID:208

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_v5rvylxm.2rd.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

        Filesize

        215B

        MD5

        965c829039f3d549a5905a168ee34311

        SHA1

        dc572eeb4e27bb6892ed39ae05506bf76c9c2a38

        SHA256

        b17acacbd92259fbab080f8d284f6b971493561f8b7243972309289949a9d522

        SHA512

        6045c9a65cdaa78222dc3eab4320522fe868077d635c8aecf8effcdadd2219747cdfad67175ecc061e88b94465664b1401091a5fa65cba7f3006f27b39b37fae

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

        Filesize

        3.3MB

        MD5

        9eb8732b560208f0380c386771aba096

        SHA1

        d2ae1ff6755e79f97485aea27912ed7710378b08

        SHA256

        d00477c11f3c8ad73a0ea9c3c4b7e549754ed63b645a3a8f57de6dd2f89ec8d0

        SHA512

        686b1968a19d6f81562df6efd659060ecc7d2eceb7b053d530e8bcba030db6e7b55cb7c6364d6dddc7ea9a46b5004cae3a78db5b432ed279ce2fa854fa400b8a

      • memory/1912-24-0x0000028E346F0000-0x0000028E34712000-memory.dmp

        Filesize

        136KB

      • memory/3896-13-0x000000001C100000-0x000000001C1B2000-memory.dmp

        Filesize

        712KB

      • memory/3896-10-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp

        Filesize

        10.8MB

      • memory/3896-11-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp

        Filesize

        10.8MB

      • memory/3896-12-0x000000001B8F0000-0x000000001B940000-memory.dmp

        Filesize

        320KB

      • memory/3896-14-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp

        Filesize

        10.8MB

      • memory/3896-17-0x000000001C090000-0x000000001C0A2000-memory.dmp

        Filesize

        72KB

      • memory/3896-18-0x000000001CE00000-0x000000001CE3C000-memory.dmp

        Filesize

        240KB

      • memory/3896-31-0x000000001D670000-0x000000001DB98000-memory.dmp

        Filesize

        5.2MB

      • memory/3896-41-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp

        Filesize

        10.8MB

      • memory/5080-0-0x00007FFD1F223000-0x00007FFD1F225000-memory.dmp

        Filesize

        8KB

      • memory/5080-9-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp

        Filesize

        10.8MB

      • memory/5080-2-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp

        Filesize

        10.8MB

      • memory/5080-1-0x0000000000790000-0x0000000000AE8000-memory.dmp

        Filesize

        3.3MB