Overview

overview

10

Static

static

10

a4f821fd1a...54.exe

windows10-2004-x64

10

a4f821fd1a...54.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    16/07/2026, 04:26

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General

  • Target
    a4f821fd1a9340fad93620dcc2ca4c702a9b0ca37880a717a52b878103424354.exe
  • Size 45KB
  • Sample260716-e2scdscz6n
  • SHA256 a4f821fd1a9340fad93620dcc2ca4c702a9b0ca37880a717a52b878103424354
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defaultdefense_evasiondiscoveryexecutionasyncratpersistencerat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 0.5.8

Botnet

  • Default

C2

  • sexviet.me:80

  • sexviet.me:22

  • sexviet.me:8080

  • sexviet.me:8880

  • sexviet.me:2052

  • sexviet.me:2082

  • sexviet.me:2086

  • sexviet.me:2095

  • sexviet.me:443

  • sexviet.me:2053

  • sexviet.me:2083

  • sexviet.me:2087

  • sexviet.me:2096

  • sexviet.me:8443

  • www.sexviet.me:80

  • www.sexviet.me:22

  • www.sexviet.me:8080

  • www.sexviet.me:8880

  • www.sexviet.me:2052

  • www.sexviet.me:2082

Mutex

  • pxpeLxUbyPxL

Attributes
  • delay

    0

  • install

    true

  • install_file

    4buhc.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 2 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).

  • 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\a4f821fd1a9340fad93620dcc2ca4c702a9b0ca37880a717a52b878103424354.exe
    "C:\Users\Admin\AppData\Local\Temp\a4f821fd1a9340fad93620dcc2ca4c702a9b0ca37880a717a52b878103424354.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:756
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "4buhc" /tr '"C:\Users\Admin\AppData\Roaming\4buhc.exe"' & exit
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2948
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "4buhc" /tr '"C:\Users\Admin\AppData\Roaming\4buhc.exe"'
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:4400
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpFA7D.tmp.bat""
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4368
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • System Location Discovery: System Language Discovery
        • Delays execution with timeout.exe
        PID:1828
      • C:\Users\Admin\AppData\Roaming\4buhc.exe
        "C:\Users\Admin\AppData\Roaming\4buhc.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        PID:2320
  • C:\Users\Admin\AppData\Roaming\4buhc.exe
    "C:\Users\Admin\AppData\Roaming\4buhc.exe"
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    PID:4992

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        tmpFA7D.tmp.bat
        • Path C:\Users\Admin\AppData\Local\Temp\tmpFA7D.tmp.bat
        • Size 149B
        • SHA256 2a73fddcac0d8c9d366201a3cd811649e7e000024a598d36fea6e0aa0129659f
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        4buhc.exe
        • Path C:\Users\Admin\AppData\Roaming\4buhc.exe
        • Size 45KB
        • SHA256 a4f821fd1a9340fad93620dcc2ca4c702a9b0ca37880a717a52b878103424354
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/756-0-0x0000000000E40000-0x0000000000E52000-memory.dmp
        Download

        memory/756-1-0x00000000058F0000-0x0000000005900000-memory.dmp
        Download

        memory/756-2-0x00000000057F0000-0x000000000588C000-memory.dmp
        Download

        memory/4992-10-0x0000000004C30000-0x0000000004C40000-memory.dmp
        Download

        memory/4992-13-0x0000000004C30000-0x0000000004C40000-memory.dmp
        Download