Overview

overview

10

Static

static

10

16b915a1c1...4f.exe

windows10-2004-x64

10

16b915a1c1...4f.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260911-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    19/09/2026, 12:44

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General

  • Target
    16b915a1c16dfc62263a5296d4d18512a304395dad6a68f12b44a54ece20e04f.exe
  • Size 45KB
  • Sample260919-pyfjjack71
  • SHA256 16b915a1c16dfc62263a5296d4d18512a304395dad6a68f12b44a54ece20e04f
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defaultcommand_and_controldefense_evasiondiscoveryexecutionasyncratpersistencerat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 0.5.8

Botnet

  • Default

C2

  • viet69no1.net:80

  • viet69no1.net:22

  • viet69no1.net:8080

  • viet69no1.net:8880

  • viet69no1.net:2052

  • viet69no1.net:2082

  • viet69no1.net:2086

  • viet69no1.net:2095

  • viet69no1.net:443

  • viet69no1.net:2053

  • viet69no1.net:2083

  • viet69no1.net:2087

  • viet69no1.net:2096

  • viet69no1.net:8443

  • www.viet69no1.net:80

  • www.viet69no1.net:22

  • www.viet69no1.net:8080

  • www.viet69no1.net:8880

  • www.viet69no1.net:2052

  • www.viet69no1.net:2082

Mutex

  • 2ItYd8khP5RN

Attributes
  • delay

    0

  • install

    true

  • install_file

    u2yb.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
  • Outbound SSH connection to public host 2 TTPs 2 IoCs

    SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

    command_and_control
  • 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 23 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\16b915a1c16dfc62263a5296d4d18512a304395dad6a68f12b44a54ece20e04f.exe
    "C:\Users\Admin\AppData\Local\Temp\16b915a1c16dfc62263a5296d4d18512a304395dad6a68f12b44a54ece20e04f.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3936
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "u2yb" /tr '"C:\Users\Admin\AppData\Roaming\u2yb.exe"' & exit
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2936
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "u2yb" /tr '"C:\Users\Admin\AppData\Roaming\u2yb.exe"'
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:3940
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9B60.tmp.bat""
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4664
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • System Location Discovery: System Language Discovery
        • Delays execution with timeout.exe
        PID:3836
      • C:\Users\Admin\AppData\Roaming\u2yb.exe
        "C:\Users\Admin\AppData\Roaming\u2yb.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        PID:932
  • C:\Users\Admin\AppData\Roaming\u2yb.exe
    "C:\Users\Admin\AppData\Roaming\u2yb.exe"
    1⤵
    • Executes dropped EXE
    • Outbound SSH connection to public host
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    PID:1500

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        tmp9B60.tmp.bat
        • Path C:\Users\Admin\AppData\Local\Temp\tmp9B60.tmp.bat
        • Size 148B
        • SHA256 38a378659f6a612cc82d8f33e6531df201b9e00d2e63086ead31620c920d4d6d
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        u2yb.exe
        • Path C:\Users\Admin\AppData\Roaming\u2yb.exe
        • Size 45KB
        • SHA256 16b915a1c16dfc62263a5296d4d18512a304395dad6a68f12b44a54ece20e04f
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/1500-10-0x0000000005070000-0x0000000005080000-memory.dmp
        Download

        memory/1500-13-0x0000000005070000-0x0000000005080000-memory.dmp
        Download

        memory/3936-0-0x00000000003A0000-0x00000000003B2000-memory.dmp
        Download

        memory/3936-1-0x0000000004D50000-0x0000000004D60000-memory.dmp
        Download

        memory/3936-2-0x0000000004D60000-0x0000000004DFC000-memory.dmp
        Download