Overview

overview

10

Static

static

10

AsyncClient.exe

windows10-2004-x64

10

AsyncClient.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    100s
  • max time network
    151s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260706-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260706-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    08/07/2026, 08:36

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General

  • Target
    AsyncClient.exe
  • Size 45KB
  • Sample260708-khly6aev6q
  • SHA256 3716f020f6aed3406003e38ada1d705c0880992edf12c09ccbb24cf0b87c0da0
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
adwaredefaultdiscoveryasyncratpersistenceratspyware

Malware Config

Extracted

Family

  • asyncrat

Version

  • 0.5.8

Botnet

  • Default

C2

  • vietnamgamble.com/vi-vn/:6606

  • vietnamgamble.com/vi-vn/:7707

  • vietnamgamble.com/vi-vn/:8808

  • vietnamgamble.com/vi-vn/:443

  • vietnamgamble.com/vi-vn/:80

  • vietnamgamble.com/vi-vn/:8844

  • vietnamgamble.com/vi-vn/:22

  • vietnamgamble.com/vi-vn/:53

  • vietnamgamble.com:6606

  • vietnamgamble.com:7707

  • vietnamgamble.com:8808

  • vietnamgamble.com:443

  • vietnamgamble.com:80

  • vietnamgamble.com:8844

  • vietnamgamble.com:22

  • vietnamgamble.com:53

Mutex

  • U84mNBO1a4sj

Attributes
  • delay

    9

  • install

    false

  • install_folder

    %AppData%

aes.plain

Signatures

  • Family: AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers written in C#.

    ratasyncrat
  • Boot or Logon Autostart Execution: Active Setup 2 TTPs 1 IoCs

    Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

    persistence
  • Unexpected DNS network traffic destination 2 IoCs

    Network traffic to other servers than the configured DNS servers was detected on the DNS port.

  • Enumerates connected drives 3 TTPs 2 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • 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.

    discovery
  • Checks SCSI registry key(s) 3 TTPs 62 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
    adwarespyware
  • Modifies registry class 38 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 46 IoCs
  • Suspicious use of FindShellTrayWindow 53 IoCs
  • Suspicious use of SendNotifyMessage 40 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 1 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.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
    "C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
    1⤵
    • Unexpected DNS network traffic destination
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    PID:4432
  • C:\Windows\system32\sihost.exe
    sihost.exe
    1⤵
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of WriteProcessMemory
    PID:4180
    • C:\Windows\explorer.exe
      explorer.exe /LOADSAVEDWINDOWS
      2⤵
      • Boot or Logon Autostart Execution: Active Setup
      • Enumerates connected drives
      • Checks SCSI registry key(s)
      • Modifies Internet Explorer settings
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      PID:5240
  • C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe
    "C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe" -ServerName:CortanaUI.AppXstmwaab17q5s3y22tp6apqz7a45vwv65.mca
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:2952
  • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
    "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:5852

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        prep_Activatable Class_Hermes_perf.cache
        • Path C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\TempState\prep_Activatable Class_Hermes_perf.cache
        • Size 599B
        • SHA256 b536a3dae9ea5c69081f0491eed829e3b57e32401fdf49a63031bcd6b20e6fdb
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        memory/2952-19-0x000001E993D90000-0x000001E993E90000-memory.dmp
        Download

        memory/2952-6-0x000001E9801E0000-0x000001E9802E0000-memory.dmp
        Download

        memory/2952-8-0x000001E9801E0000-0x000001E9802E0000-memory.dmp
        Download

        memory/2952-38-0x000001E983D10000-0x000001E983D30000-memory.dmp
        Download

        memory/2952-52-0x000001E994210000-0x000001E994230000-memory.dmp
        Download

        memory/2952-18-0x000001E983930000-0x000001E983950000-memory.dmp
        Download

        memory/4432-2-0x0000000074C92000-0x0000000074C93000-memory.dmp
        Download

        memory/4432-3-0x0000000074C80000-0x000000007543C000-memory.dmp
        Download

        memory/4432-4-0x0000000074C80000-0x000000007543C000-memory.dmp
        Download

        memory/4432-1-0x0000000000E30000-0x0000000000E42000-memory.dmp
        Download

        memory/4432-0-0x0000000074C92000-0x0000000074C93000-memory.dmp
        Download

        memory/5240-193-0x000000000DBA0000-0x000000000E41B000-memory.dmp
        Download