Overview

overview

10

Static

static

10

Muco.exe

windows10-2004-x64

10

Muco.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    148s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260710-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260710-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    31/08/2026, 07:38

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General

  • Target
    Muco.exe
  • Size 49KB
  • Sample260831-jgwarser9w
  • SHA256 7b24fb576ef05d59cfa5680c3a2554b4fcb5052eb06394b649cdea1be9b59a35
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defaultdefense_evasiondiscoveryexecutionasyncratpersistencerat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 0.5.8

Botnet

  • Default

C2

  • 789win.com.mx/vi-vn/:80

  • 789win.com.mx/vi-vn/:8080

  • 789win.com.mx/vi-vn/:443

  • 789win.com.mx/vi-vn/:8443

  • 789win.com.mx/vi-vn/:22

  • 789win.com.mx/vi-vn/:23

  • 789win.com.mx/vi-vn/:6606

  • 789win.com.mx/vi-vn/:5555

  • 789win29.autos/vi-vn/:80

  • 789win29.autos/vi-vn/:8080

  • 789win29.autos/vi-vn/:443

  • 789win29.autos/vi-vn/:8443

  • 789win29.autos/vi-vn/:22

  • 789win29.autos/vi-vn/:23

  • 789win29.autos/vi-vn/:6606

  • 789win29.autos/vi-vn/:5555

  • 789win123.com/vi-vn/:80

  • 789win123.com/vi-vn/:8080

  • 789win123.com/vi-vn/:443

  • 789win123.com/vi-vn/:8443

Mutex

  • B8yCkl7Vhrcz

Attributes
  • delay

    3

  • install

    true

  • install_file

    GoogleUpdate.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
  • 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 31 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Muco.exe
    "C:\Users\Admin\AppData\Local\Temp\Muco.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5056
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "GoogleUpdate" /tr '"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"' & exit
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2120
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "GoogleUpdate" /tr '"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"'
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:3516
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA7EE.tmp.bat""
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:236
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • System Location Discovery: System Language Discovery
        • Delays execution with timeout.exe
        PID:2680
      • C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
        "C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        PID:4784
  • C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
    "C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    PID:1196

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        tmpA7EE.tmp.bat
        • Path C:\Users\Admin\AppData\Local\Temp\tmpA7EE.tmp.bat
        • Size 156B
        • SHA256 e923b02254d313a9fcecde3f7e6be54c4a623b3f0b160b1b368710c7fea9c7e7
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        GoogleUpdate.exe
        • Path C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
        • Size 49KB
        • SHA256 7b24fb576ef05d59cfa5680c3a2554b4fcb5052eb06394b649cdea1be9b59a35
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/1196-13-0x0000000074950000-0x000000007510C000-memory.dmp
        Download

        memory/1196-15-0x0000000074950000-0x000000007510C000-memory.dmp
        Download

        memory/5056-0-0x0000000074962000-0x0000000074963000-memory.dmp
        Download

        memory/5056-1-0x00000000004A0000-0x00000000004B2000-memory.dmp
        Download

        memory/5056-2-0x0000000074950000-0x000000007510C000-memory.dmp
        Download

        memory/5056-3-0x0000000004E40000-0x0000000004EA6000-memory.dmp
        Download

        memory/5056-4-0x00000000052C0000-0x000000000535C000-memory.dmp
        Download

        memory/5056-10-0x0000000074950000-0x000000007510C000-memory.dmp
        Download