Overview

overview

10

Static

static

10

31f6446c63...67.exe

windows10-2004-x64

10

31f6446c63...67.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    16/07/2026, 14:06

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General

  • Target
    31f6446c632430cd9b8fc91173849990d9508ae611c7a082c1d4b0b057109c67.exe
  • Size 45KB
  • Sample260716-ref23aaz41
  • SHA256 31f6446c632430cd9b8fc91173849990d9508ae611c7a082c1d4b0b057109c67
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defaultdefense_evasiondiscoveryexecutionasyncratpersistencerat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 0.5.8

Botnet

  • Default

C2

  • fimsexnhatban.com:80

  • fimsexnhatban.com:22

  • fimsexnhatban.com:8080

  • fimsexnhatban.com:8880

  • fimsexnhatban.com:2052

  • fimsexnhatban.com:2082

  • fimsexnhatban.com:2086

  • fimsexnhatban.com:2095

  • fimsexnhatban.com:443

  • fimsexnhatban.com:2053

  • fimsexnhatban.com:2083

  • fimsexnhatban.com:2087

  • fimsexnhatban.com:2096

  • fimsexnhatban.com:8443

  • www.fimsexnhatban.com:80

  • www.fimsexnhatban.com:22

  • www.fimsexnhatban.com:8080

  • www.fimsexnhatban.com:8880

  • www.fimsexnhatban.com:2052

  • www.fimsexnhatban.com:2082

Mutex

  • EBQpESe4yLAP

Attributes
  • delay

    0

  • install

    true

  • install_file

    yz9qy9m.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 1 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).

  • 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 21 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\31f6446c632430cd9b8fc91173849990d9508ae611c7a082c1d4b0b057109c67.exe
    "C:\Users\Admin\AppData\Local\Temp\31f6446c632430cd9b8fc91173849990d9508ae611c7a082c1d4b0b057109c67.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2428
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "yz9qy9m" /tr '"C:\Users\Admin\AppData\Roaming\yz9qy9m.exe"' & exit
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:1872
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "yz9qy9m" /tr '"C:\Users\Admin\AppData\Roaming\yz9qy9m.exe"'
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:1144
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpDAEA.tmp.bat""
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2208
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • System Location Discovery: System Language Discovery
        • Delays execution with timeout.exe
        PID:1028
      • C:\Users\Admin\AppData\Roaming\yz9qy9m.exe
        "C:\Users\Admin\AppData\Roaming\yz9qy9m.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        PID:3712
  • C:\Users\Admin\AppData\Roaming\yz9qy9m.exe
    "C:\Users\Admin\AppData\Roaming\yz9qy9m.exe"
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    PID:2144

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        tmpDAEA.tmp.bat
        • Path C:\Users\Admin\AppData\Local\Temp\tmpDAEA.tmp.bat
        • Size 151B
        • SHA256 5a9c9e3bc05fa87c69c9a43de780d256b3b4a6fdee0294becdfd0f7bea00661e
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        yz9qy9m.exe
        • Path C:\Users\Admin\AppData\Roaming\yz9qy9m.exe
        • Size 45KB
        • SHA256 31f6446c632430cd9b8fc91173849990d9508ae611c7a082c1d4b0b057109c67
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/2144-10-0x0000000004980000-0x0000000004990000-memory.dmp
        Download

        memory/2144-13-0x0000000004980000-0x0000000004990000-memory.dmp
        Download

        memory/2428-0-0x0000000000C30000-0x0000000000C42000-memory.dmp
        Download

        memory/2428-1-0x0000000003070000-0x0000000003080000-memory.dmp
        Download

        memory/2428-2-0x0000000005680000-0x000000000571C000-memory.dmp
        Download