Analysis

  • max time kernel
    325s
  • max time network
    329s
  • 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, 22:04

General

  • Target

    Client-built.exe

  • Size

    3.4MB

  • MD5

    bc04ef1699a3b490ff2703a0bb2dcca0

  • SHA1

    b3f70784fb7c7ef0a3cca81280ede2ffe2671e35

  • SHA256

    844f43264b78b25a6526ab5f9997cca8243f67d51400f2abd4fd3c777b5fb983

  • SHA512

    e3d11bd54f4409c3a846e6466063d5e29f8222b3c2a2291b19401632a7a3884ed6bde8327c664f2b43e6e67914fca1eae4805730adbfd37706ac4d7e0a28a2e1

  • SSDEEP

    49152:xei8dGFjxJFp/DGoye3Z4LVYcl9v6igI2VSG3THHB72eh2NTfXDW:xeCFjxJTbGor3Z4LVY9r+JT

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

SKIDS

C2

147.185.221.22:10340

Mutex

9b51d4f5-bfe4-4a06-ba47-dcfbf9fe8529

Attributes
  • encryption_key

    9E968F05BD874BA1BE086FD1774A027473823F49

  • 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 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:4760
    • 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:2952
    • 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 SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1788
      • 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:2808
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /delete /tn "Windows Host Process" /f
        3⤵
          PID:4856
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\lnCpXrcf0oWv.bat" "
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:4168
          • C:\Windows\system32\chcp.com
            chcp 65001
            4⤵
              PID:372
            • C:\Windows\system32\PING.EXE
              ping -n 10 localhost
              4⤵
              • System Network Configuration Discovery: Internet Connection Discovery
              • Runs ping.exe
              PID:4260

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\lnCpXrcf0oWv.bat

        Filesize

        215B

        MD5

        a004cb3b4e56b606847a9e45983566a0

        SHA1

        3507e1a341551c4099e1b795bd4e2d4086676760

        SHA256

        41954e985436118cc23fa2466ee4f997d3d84dad48691e5646b674f6fe1050c4

        SHA512

        3e45874dddbadac74606402dd3083cf58c2e654d7ffed9192ff9b0452b92cf35f6bf70a4d16f659a0bc3b4c7d7d3247a7a2d05bb992a0b0b4eed6d7c840a8257

      • C:\Windows\system32\Windows\Windows Host Process.exe

        Filesize

        3.4MB

        MD5

        bc04ef1699a3b490ff2703a0bb2dcca0

        SHA1

        b3f70784fb7c7ef0a3cca81280ede2ffe2671e35

        SHA256

        844f43264b78b25a6526ab5f9997cca8243f67d51400f2abd4fd3c777b5fb983

        SHA512

        e3d11bd54f4409c3a846e6466063d5e29f8222b3c2a2291b19401632a7a3884ed6bde8327c664f2b43e6e67914fca1eae4805730adbfd37706ac4d7e0a28a2e1

      • memory/1788-11-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

        Filesize

        10.8MB

      • memory/1788-9-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

        Filesize

        10.8MB

      • memory/1788-12-0x000000001B1B0000-0x000000001B200000-memory.dmp

        Filesize

        320KB

      • memory/1788-13-0x000000001BB40000-0x000000001BBF2000-memory.dmp

        Filesize

        712KB

      • memory/1788-14-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

        Filesize

        10.8MB

      • memory/1788-17-0x000000001B260000-0x000000001B272000-memory.dmp

        Filesize

        72KB

      • memory/1788-18-0x000000001BAC0000-0x000000001BAFC000-memory.dmp

        Filesize

        240KB

      • memory/1788-23-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

        Filesize

        10.8MB

      • memory/4760-2-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

        Filesize

        10.8MB

      • memory/4760-10-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

        Filesize

        10.8MB

      • memory/4760-0-0x00007FF90CC43000-0x00007FF90CC45000-memory.dmp

        Filesize

        8KB

      • memory/4760-1-0x0000000000770000-0x0000000000AD0000-memory.dmp

        Filesize

        3.4MB