Overview

overview

10

Static

static

10

R4.exe

windows10-2004-x64

10

R4.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    58s
  • max time network
    57s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260911-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    24/09/2026, 04:33

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General

  • Target
    R4.exe
  • Size 68KB
  • Sample260924-e6rlnayfmc
  • SHA256 87f78f675a9b26bbd01f5f1aed47f8d4f4d12f0a6686f539e68e79166e9ef3c0
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defaultdefense_evasionexecutionasyncratpersistencerat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 1.0.7

Botnet

  • Default

C2

  • xoso6684.com:8080

  • xoso6684.com:443

  • xoso6684.com:80

  • www.xoso6684.com:8080

  • www.xoso6684.com:443

  • www.xoso6684.com:80

  • c2.xoso6684.com:8080

  • c2.xoso6684.com:443

  • c2.xoso6684.com:80

  • malware.xoso6684.com:8080

  • malware.xoso6684.com:443

  • malware.xoso6684.com:80

  • backdoor.xoso6684.com:8080

  • backdoor.xoso6684.com:443

  • backdoor.xoso6684.com:80

  • api.xoso6684.com:8080

  • api.xoso6684.com:443

  • api.xoso6684.com:80

Mutex

  • S8_Mutex

Attributes
  • delay

    1

  • install

    true

  • install_file

    s8.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).

  • 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
  • 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 3 IoCs
  • Suspicious use of WriteProcessMemory 5 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\R4.exe
    "C:\Users\Admin\AppData\Local\Temp\R4.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1364
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "s8" /tr '"C:\Users\Admin\AppData\Roaming\s8.exe"' & exit
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:3748
      • C:\Windows\system32\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "s8" /tr '"C:\Users\Admin\AppData\Roaming\s8.exe"'
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:4936
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp93CF.tmp.bat""
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:768
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:4796
      • C:\Users\Admin\AppData\Roaming\s8.exe
        "C:\Users\Admin\AppData\Roaming\s8.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:2636
  • C:\Users\Admin\AppData\Roaming\s8.exe
    "C:\Users\Admin\AppData\Roaming\s8.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4420

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        tmp93CF.tmp.bat
        • Path C:\Users\Admin\AppData\Local\Temp\tmp93CF.tmp.bat
        • Size 146B
        • SHA256 414292805ecd0f1396b9ef9a8e28f5cfae1cf19647440f77a462902d1a4af0bd
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        s8.exe
        • Path C:\Users\Admin\AppData\Roaming\s8.exe
        • Size 68KB
        • SHA256 87f78f675a9b26bbd01f5f1aed47f8d4f4d12f0a6686f539e68e79166e9ef3c0
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/1364-0-0x0000000000E60000-0x0000000000E76000-memory.dmp
        Download

        memory/1364-1-0x000000001BB30000-0x000000001BB40000-memory.dmp
        Download