Overview

overview

10

Static

static

10

a4f1b6aeb4...ee.exe

windows10-2004-x64

10

a4f1b6aeb4...ee.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    20/07/2026, 17:21

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General

  • Target
    a4f1b6aeb4090a1c8d191372bc0d50ded276b8d3aa453c24a7221dd53927c5ee.exe
  • Size 45KB
  • Sample260720-vxgm4abs2x
  • SHA256 a4f1b6aeb4090a1c8d191372bc0d50ded276b8d3aa453c24a7221dd53927c5ee
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defaultdefense_evasiondiscoveryexecutionasyncratpersistencerat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 0.5.8

Botnet

  • Default

C2

  • phimsexvietnamhd.net:80

  • phimsexvietnamhd.net:22

  • phimsexvietnamhd.net:8080

  • phimsexvietnamhd.net:8880

  • phimsexvietnamhd.net:2052

  • phimsexvietnamhd.net:2082

  • phimsexvietnamhd.net:2086

  • phimsexvietnamhd.net:2095

  • phimsexvietnamhd.net:443

  • phimsexvietnamhd.net:2053

  • phimsexvietnamhd.net:2083

  • phimsexvietnamhd.net:2087

  • phimsexvietnamhd.net:2096

  • phimsexvietnamhd.net:8443

  • www.phimsexvietnamhd.net:80

  • www.phimsexvietnamhd.net:22

  • www.phimsexvietnamhd.net:8080

  • www.phimsexvietnamhd.net:8880

  • www.phimsexvietnamhd.net:2052

  • www.phimsexvietnamhd.net:2082

Mutex

  • U4FbPHrdgkoS

Attributes
  • delay

    0

  • install

    true

  • install_file

    yk8s.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • Family: AsyncRat

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

    ratasyncrat
  • Async RAT payload 2 IoCs
    rat
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Executes a command shell one-liner 1 TTPs 2 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

    execution
  • System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

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

    discovery
  • Delays execution with timeout.exe 1 IoCs
    defense_evasion
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistenceexecution
  • Suspicious behavior: EnumeratesProcesses 23 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a4f1b6aeb4090a1c8d191372bc0d50ded276b8d3aa453c24a7221dd53927c5ee.exe
    "C:\Users\Admin\AppData\Local\Temp\a4f1b6aeb4090a1c8d191372bc0d50ded276b8d3aa453c24a7221dd53927c5ee.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1836
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "yk8s" /tr '"C:\Users\Admin\AppData\Roaming\yk8s.exe"' & exit
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4620
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "yk8s" /tr '"C:\Users\Admin\AppData\Roaming\yk8s.exe"'
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:1136
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4551.tmp.bat""
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:1128
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • System Location Discovery: System Language Discovery
        • Delays execution with timeout.exe
        PID:5100
      • C:\Users\Admin\AppData\Roaming\yk8s.exe
        "C:\Users\Admin\AppData\Roaming\yk8s.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        PID:1212
  • C:\Users\Admin\AppData\Roaming\yk8s.exe
    "C:\Users\Admin\AppData\Roaming\yk8s.exe"
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    PID:2160

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        tmp4551.tmp.bat
        • Path C:\Users\Admin\AppData\Local\Temp\tmp4551.tmp.bat
        • Size 148B
        • SHA256 7a3bb873f482816c968ee1802de5180e16f9323c3185bc1323539641d72518a8
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        yk8s.exe
        • Path C:\Users\Admin\AppData\Roaming\yk8s.exe
        • Size 45KB
        • SHA256 a4f1b6aeb4090a1c8d191372bc0d50ded276b8d3aa453c24a7221dd53927c5ee
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/1836-0-0x0000000000CB0000-0x0000000000CC2000-memory.dmp
        Download

        memory/1836-1-0x00000000056E0000-0x00000000056F0000-memory.dmp
        Download

        memory/1836-2-0x00000000055B0000-0x000000000564C000-memory.dmp
        Download

        memory/2160-10-0x0000000005820000-0x0000000005830000-memory.dmp
        Download

        memory/2160-13-0x0000000005820000-0x0000000005830000-memory.dmp
        Download