Analysis

  • max time kernel
    788s
  • max time network
    805s
  • 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, 22:16

General

  • Target

    Client-built.exe

  • Size

    3.4MB

  • MD5

    ad8250eea17d8d7db7c3c23aba289f5c

  • SHA1

    c63d1c6b6e8b7789a777b1ffe55f15bbbfc3cc59

  • SHA256

    f3de21ec995555ab187ce0a254d2b353c1ed3c06030678f898ec56efabbae51f

  • SHA512

    d34b9db43bd08dea4452925c7c1cf4014d03b024a663b5ee938a4f205b3c6c49eccd169cbc687145d54223d07aafcde75ee0807963e705c9c71e130c00086abd

  • SSDEEP

    49152:tei8dGFjxJFp/DGoye3Z4LVXcBzJQI2zoTHHB72eh2NTfbDW:teCFjxJTbGor3Z4LVSeDH

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

    AEAE9E349BB922A243A5FF22FF4A80613533B71B

  • 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
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 5 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 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⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3424
    • 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:2812
    • C:\Windows\system32\Windows\Windows Host Process.exe
      "C:\Windows\system32\Windows\Windows Host Process.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2140
      • 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:4884

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.4MB

    MD5

    ad8250eea17d8d7db7c3c23aba289f5c

    SHA1

    c63d1c6b6e8b7789a777b1ffe55f15bbbfc3cc59

    SHA256

    f3de21ec995555ab187ce0a254d2b353c1ed3c06030678f898ec56efabbae51f

    SHA512

    d34b9db43bd08dea4452925c7c1cf4014d03b024a663b5ee938a4f205b3c6c49eccd169cbc687145d54223d07aafcde75ee0807963e705c9c71e130c00086abd

  • memory/2140-10-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp

    Filesize

    10.8MB

  • memory/2140-11-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp

    Filesize

    10.8MB

  • memory/2140-12-0x000000001C470000-0x000000001C4C0000-memory.dmp

    Filesize

    320KB

  • memory/2140-13-0x000000001C580000-0x000000001C632000-memory.dmp

    Filesize

    712KB

  • memory/2140-14-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp

    Filesize

    10.8MB

  • memory/3424-0-0x00007FFE509A3000-0x00007FFE509A5000-memory.dmp

    Filesize

    8KB

  • memory/3424-1-0x0000000000E70000-0x00000000011D0000-memory.dmp

    Filesize

    3.4MB

  • memory/3424-2-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp

    Filesize

    10.8MB

  • memory/3424-9-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp

    Filesize

    10.8MB