Overview

overview

10

Static

static

10

tmpkwlfqzbm.exe

windows10-ltsc_2021-x64

10

tmpkwlfqzbm.exe

windows10-2004-x64

10

tmpkwlfqzbm.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • 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
    02/06/2026, 09:09

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General

  • Target
    tmpkwlfqzbm.exe
  • Size 130KB
  • Sample260602-k4weqaaz2j
  • SHA256 b6badd77d0d32c295b8b9f66afef0437e4a6fdc9db5d8dff50a858b068f1d025
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defaultdefense_evasionexecutionasyncratpersistencerat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 1.0.7

Botnet

  • Default

C2

  • ok99.jp.net:8848

  • ok99.jp.net:8080

  • ok99.jp.net:443

  • ok99.jp.net:80

  • app.ok99.jp.net:8848

  • app.ok99.jp.net:8080

  • app.ok99.jp.net:443

  • app.ok99.jp.net:80

  • www.ok99.jp.net:8848

  • www.ok99.jp.net:8080

  • www.ok99.jp.net:443

  • www.ok99.jp.net:80

Mutex

  • DcRatMutex_qwqdanchun

Attributes
  • delay

    1

  • install

    true

  • install_file

    chrome.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).

  • 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 64 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\tmpkwlfqzbm.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpkwlfqzbm.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:6004
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "chrome" /tr '"C:\Users\Admin\AppData\Roaming\chrome.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4404
      • C:\Windows\system32\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "chrome" /tr '"C:\Users\Admin\AppData\Roaming\chrome.exe"'
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:4540
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9EEB.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1800
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:2020
      • C:\Users\Admin\AppData\Roaming\chrome.exe
        "C:\Users\Admin\AppData\Roaming\chrome.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:1308
  • C:\Users\Admin\AppData\Roaming\chrome.exe
    "C:\Users\Admin\AppData\Roaming\chrome.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    PID:2352

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        tmp9EEB.tmp.bat
        • Path C:\Users\Admin\AppData\Local\Temp\tmp9EEB.tmp.bat
        • Size 150B
        • SHA256 6fb9891ee85052d1d790d80d943311839632f8094b22cd839f3b3d60db5651e5
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        chrome.exe
        • Path C:\Users\Admin\AppData\Roaming\chrome.exe
        • Size 130KB
        • SHA256 b6badd77d0d32c295b8b9f66afef0437e4a6fdc9db5d8dff50a858b068f1d025
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/6004-0-0x00000000000E0000-0x0000000000106000-memory.dmp
        Download

        memory/6004-1-0x0000000002390000-0x00000000023A0000-memory.dmp
        Download