Overview

overview

10

Static

static

10

85761b2226...60.exe

windows10-2004-x64

10

85761b2226...60.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    04/08/2026, 19:55

Sharing

Copy URL Twitter E-mail
Report Analysis Logs

General

  • Target
    85761b2226a347edadaa0f06ab31468227206676851982cc3ca8bfaf06b77360.exe
  • Size 45KB
  • Sample260804-ym4lnaw1ew
  • SHA256 85761b2226a347edadaa0f06ab31468227206676851982cc3ca8bfaf06b77360
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defaultdefense_evasiondiscoveryexecutionasyncratpersistencerat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 0.5.8

Botnet

  • Default

C2

  • viet18.org:80

  • viet18.org:22

  • viet18.org:8080

  • viet18.org:8880

  • viet18.org:2052

  • viet18.org:2082

  • viet18.org:2086

  • viet18.org:2095

  • viet18.org:443

  • viet18.org:2053

  • viet18.org:2083

  • viet18.org:2087

  • viet18.org:2096

  • viet18.org:8443

  • www.viet18.org:80

  • www.viet18.org:22

  • www.viet18.org:8080

  • www.viet18.org:8880

  • www.viet18.org:2052

  • www.viet18.org:2082

Mutex

  • Y1im9bDQ2ry9

Attributes
  • delay

    0

  • install

    true

  • install_file

    ylfz9.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 2 IoCs
  • Suspicious use of WriteProcessMemory 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\85761b2226a347edadaa0f06ab31468227206676851982cc3ca8bfaf06b77360.exe
    "C:\Users\Admin\AppData\Local\Temp\85761b2226a347edadaa0f06ab31468227206676851982cc3ca8bfaf06b77360.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4636
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "ylfz9" /tr '"C:\Users\Admin\AppData\Roaming\ylfz9.exe"' & exit
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:720
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "ylfz9" /tr '"C:\Users\Admin\AppData\Roaming\ylfz9.exe"'
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:2712
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5395.tmp.bat""
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:5944
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • System Location Discovery: System Language Discovery
        • Delays execution with timeout.exe
        PID:5084
      • C:\Users\Admin\AppData\Roaming\ylfz9.exe
        "C:\Users\Admin\AppData\Roaming\ylfz9.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        PID:5300
  • C:\Users\Admin\AppData\Roaming\ylfz9.exe
    "C:\Users\Admin\AppData\Roaming\ylfz9.exe"
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    PID:4672

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        tmp5395.tmp.bat
        • Path C:\Users\Admin\AppData\Local\Temp\tmp5395.tmp.bat
        • Size 149B
        • SHA256 8d3c2e749d077aa0ab7a6f0f3097c5f9b79dc7c7925e509d8a0dfa0454d61a94
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ylfz9.exe
        • Path C:\Users\Admin\AppData\Roaming\ylfz9.exe
        • Size 45KB
        • SHA256 85761b2226a347edadaa0f06ab31468227206676851982cc3ca8bfaf06b77360
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/4636-0-0x0000000074B92000-0x0000000074B93000-memory.dmp
        Download

        memory/4636-1-0x00000000001C0000-0x00000000001D2000-memory.dmp
        Download

        memory/4636-2-0x0000000074B80000-0x000000007533C000-memory.dmp
        Download

        memory/4636-3-0x0000000004CC0000-0x0000000004D5C000-memory.dmp
        Download

        memory/4636-8-0x0000000074B80000-0x000000007533C000-memory.dmp
        Download

        memory/4672-12-0x0000000074A10000-0x00000000751CC000-memory.dmp
        Download

        memory/4672-14-0x0000000074A10000-0x00000000751CC000-memory.dmp
        Download