Overview

overview

10

Static

static

10

c76a9bd175...57.exe

windows10-2004-x64

10

c76a9bd175...57.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    04/08/2026, 09:09

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General

  • Target
    c76a9bd1751b33cef32c6e38c92198da7d70274330aaa3897e84131a5f332757.exe
  • Size 45KB
  • Sample260804-k4k9raweng
  • SHA256 c76a9bd1751b33cef32c6e38c92198da7d70274330aaa3897e84131a5f332757
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defaultdefense_evasiondiscoveryexecutionasyncratpersistencerat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 0.5.8

Botnet

  • Default

C2

  • sexybeam.me:80

  • sexybeam.me:22

  • sexybeam.me:8080

  • sexybeam.me:8880

  • sexybeam.me:2052

  • sexybeam.me:2082

  • sexybeam.me:2086

  • sexybeam.me:2095

  • sexybeam.me:443

  • sexybeam.me:2053

  • sexybeam.me:2083

  • sexybeam.me:2087

  • sexybeam.me:2096

  • sexybeam.me:8443

  • www.sexybeam.me:80

  • www.sexybeam.me:22

  • www.sexybeam.me:8080

  • www.sexybeam.me:8880

  • www.sexybeam.me:2052

  • www.sexybeam.me:2082

Mutex

  • 1TP1eKaEWUoQ

Attributes
  • delay

    0

  • install

    true

  • install_file

    bcolkd71.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
  • 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\c76a9bd1751b33cef32c6e38c92198da7d70274330aaa3897e84131a5f332757.exe
    "C:\Users\Admin\AppData\Local\Temp\c76a9bd1751b33cef32c6e38c92198da7d70274330aaa3897e84131a5f332757.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1028
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "bcolkd71" /tr '"C:\Users\Admin\AppData\Roaming\bcolkd71.exe"' & exit
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4508
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "bcolkd71" /tr '"C:\Users\Admin\AppData\Roaming\bcolkd71.exe"'
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:3448
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4784.tmp.bat""
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4760
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • System Location Discovery: System Language Discovery
        • Delays execution with timeout.exe
        PID:2680
      • C:\Users\Admin\AppData\Roaming\bcolkd71.exe
        "C:\Users\Admin\AppData\Roaming\bcolkd71.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        PID:4196
  • C:\Users\Admin\AppData\Roaming\bcolkd71.exe
    "C:\Users\Admin\AppData\Roaming\bcolkd71.exe"
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    PID:2416

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        tmp4784.tmp.bat
        • Path C:\Users\Admin\AppData\Local\Temp\tmp4784.tmp.bat
        • Size 152B
        • SHA256 7e92fd59065e3bf547405e9c2523b0e81c259047f51e02dfd1f3c10e090c3dfd
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        bcolkd71.exe
        • Path C:\Users\Admin\AppData\Roaming\bcolkd71.exe
        • Size 45KB
        • SHA256 c76a9bd1751b33cef32c6e38c92198da7d70274330aaa3897e84131a5f332757
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/1028-0-0x0000000000290000-0x00000000002A2000-memory.dmp
        Download

        memory/1028-1-0x0000000004CA0000-0x0000000004CB0000-memory.dmp
        Download

        memory/1028-2-0x0000000004CB0000-0x0000000004D4C000-memory.dmp
        Download

        memory/2416-10-0x0000000005800000-0x0000000005810000-memory.dmp
        Download

        memory/2416-13-0x0000000005800000-0x0000000005810000-memory.dmp
        Download