Analysis

  • max time kernel
    149s
  • max time network
    147s
  • platform
    windows7_x64
  • resource
    win7-20240708-en
  • resource tags

    arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
  • submitted
    27/11/2024, 02:51

General

  • Target
    a1799891e1d46497c6aff689f8aacda09ef5e825dd700d6fce2aa3e4ddf638b6.js
  • Size 1.5MB
  • Sample241127-dcd8sstjfx
  • SHA256 a1799891e1d46497c6aff689f8aacda09ef5e825dd700d6fce2aa3e4ddf638b6
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • asyncrat

Version
  • 0.5.7B

Botnet
  • Default-NOV-24

C2
  • chongmei33.publicvm.com:2703

  • chongmei33.publicvm.com:7031

  • jinvestments.duckdns.org:2703

  • jinvestments.duckdns.org:7031

Mutex
  • AsyncMutex_6SI8OkPnk

Attributes
  • delay

    3

  • install

    true

  • install_file

    Windows Update.exe

  • install_folder

    %AppData%

aes.plain

Extracted

Family
  • wshrat

C2
  • http://chongmei33.publicvm.com:7044

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers written in C#.

  • Asyncrat family
  • WSHRAT

    WSHRAT is a variant of Houdini worm and has vbs and js variants.

  • Wshrat family
  • Blocklisted process makes network request 24 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 6 IoCs
  • Loads dropped DLL 5 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Command and Scripting Interpreter: JavaScript 1 TTPs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 12 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Delays execution with timeout.exe 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Script User-Agent 23 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious behavior: EnumeratesProcesses 23 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe C:\Users\Admin\AppData\Local\Temp\a1799891e1d46497c6aff689f8aacda09ef5e825dd700d6fce2aa3e4ddf638b6.js
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2640
    • C:\Windows\System32\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\adobe.js"
      2⤵
      • Drops startup file
      • Adds Run key to start application
      • Suspicious use of WriteProcessMemory
      PID:2472
      • C:\Windows\System32\wscript.exe
        "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\adobe.js"
        3⤵
        • Blocklisted process makes network request
        • Drops startup file
        • Adds Run key to start application
        PID:2808
    • C:\Windows\System32\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\svchost.js"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2744
      • C:\Users\Admin\AppData\Local\Temp\Ucopa.exe
        "C:\Users\Admin\AppData\Local\Temp\Ucopa.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2732
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\vDKSLmXZAli.exe"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:696
        • C:\Windows\SysWOW64\schtasks.exe
          "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\vDKSLmXZAli" /XML "C:\Users\Admin\AppData\Local\Temp\tmp3A9.tmp"
          4⤵
          • System Location Discovery: System Language Discovery
          • Scheduled Task/Job: Scheduled Task
          PID:1436
        • C:\Users\Admin\AppData\Local\Temp\Ucopa.exe
          "C:\Users\Admin\AppData\Local\Temp\Ucopa.exe"
          4⤵
          • Executes dropped EXE
          PID:2420
        • C:\Users\Admin\AppData\Local\Temp\Ucopa.exe
          "C:\Users\Admin\AppData\Local\Temp\Ucopa.exe"
          4⤵
          • Executes dropped EXE
          PID:1932
        • C:\Users\Admin\AppData\Local\Temp\Ucopa.exe
          "C:\Users\Admin\AppData\Local\Temp\Ucopa.exe"
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1632
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Windows Update" /tr '"C:\Users\Admin\AppData\Roaming\Windows Update.exe"' & exit
            5⤵
            • System Location Discovery: System Language Discovery
            • Suspicious use of WriteProcessMemory
            PID:1488
            • C:\Windows\SysWOW64\schtasks.exe
              schtasks /create /f /sc onlogon /rl highest /tn "Windows Update" /tr '"C:\Users\Admin\AppData\Roaming\Windows Update.exe"'
              6⤵
              • System Location Discovery: System Language Discovery
              • Scheduled Task/Job: Scheduled Task
              PID:1536
          • C:\Windows\SysWOW64\cmd.exe
            cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp145B.tmp.bat""
            5⤵
            • Loads dropped DLL
            • System Location Discovery: System Language Discovery
            • Suspicious use of WriteProcessMemory
            PID:412
            • C:\Windows\SysWOW64\timeout.exe
              timeout 3
              6⤵
              • System Location Discovery: System Language Discovery
              • Delays execution with timeout.exe
              PID:1948
            • C:\Users\Admin\AppData\Roaming\Windows Update.exe
              "C:\Users\Admin\AppData\Roaming\Windows Update.exe"
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Suspicious use of SetThreadContext
              • System Location Discovery: System Language Discovery
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              PID:944
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\vDKSLmXZAli.exe"
                7⤵
                • Command and Scripting Interpreter: PowerShell
                • System Location Discovery: System Language Discovery
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:3024
              • C:\Windows\SysWOW64\schtasks.exe
                "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\vDKSLmXZAli" /XML "C:\Users\Admin\AppData\Local\Temp\tmp80E3.tmp"
                7⤵
                • System Location Discovery: System Language Discovery
                • Scheduled Task/Job: Scheduled Task
                PID:3012
              • C:\Users\Admin\AppData\Roaming\Windows Update.exe
                "C:\Users\Admin\AppData\Roaming\Windows Update.exe"
                7⤵
                • Executes dropped EXE
                • System Location Discovery: System Language Discovery
                • Suspicious use of AdjustPrivilegeToken
                PID:1504

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        Ucopa.exe

        • Path C:\Users\Admin\AppData\Local\Temp\Ucopa.exe
        • Size 613KB
        • SHA256 7ac3a47cb8196aae573d5855ce43ac0498f18281e4b9ff626f53eaf220c1fdc5
        • MD5 SHA1 SHA512 SSDEEP

        adobe.js

        • Path C:\Users\Admin\AppData\Local\Temp\adobe.js
        • Size 305KB
        • SHA256 177fa36898fbdb539116997091efff95984ccbd64a8a2b022f0557424a6fd915
        • MD5 SHA1 SHA512 SSDEEP

        svchost.js

        • Path C:\Users\Admin\AppData\Local\Temp\svchost.js
        • Size 839KB
        • SHA256 a28853b5fb6657f6491856b90e64381c197a3f7aa40a0a09199a5e9d61502bd3
        • MD5 SHA1 SHA512 SSDEEP

        tmp145B.tmp.bat

        • Path C:\Users\Admin\AppData\Local\Temp\tmp145B.tmp.bat
        • Size 158B
        • SHA256 94dbf7a8d844d2a3708db224170eca62a86e6d9bba25e92333000a3dcb5702c5
        • MD5 SHA1 SHA512

        tmp3A9.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\tmp3A9.tmp
        • Size 1KB
        • SHA256 56af708495652f4932f20dfd3e88176a7d4e0acf12959cf7882f2a87b852849b
        • MD5 SHA1 SHA512

        d93f411851d7c929.customDestinations-ms

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms
        • Size 7KB
        • SHA256 f730820598ebf9b82122f665fa5f56bd4d54f1f9c34e39485e05bf9350fc0806
        • MD5 SHA1 SHA512 SSDEEP

        memory/944-65-0x00000000012C0000-0x000000000135C000-memory.dmp

        memory/1504-81-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/1504-84-0x0000000000400000-0x0000000000412000-memory.dmp

        memory/1504-85-0x0000000000400000-0x0000000000412000-memory.dmp

        memory/1632-47-0x0000000000400000-0x0000000000412000-memory.dmp

        memory/1632-46-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/1632-44-0x0000000000400000-0x0000000000412000-memory.dmp

        memory/1632-42-0x0000000000400000-0x0000000000412000-memory.dmp

        memory/1632-40-0x0000000000400000-0x0000000000412000-memory.dmp

        memory/1632-49-0x0000000000400000-0x0000000000412000-memory.dmp

        memory/1632-51-0x0000000000400000-0x0000000000412000-memory.dmp

        memory/1632-38-0x0000000000400000-0x0000000000412000-memory.dmp

        memory/2732-23-0x00000000046C0000-0x0000000004716000-memory.dmp

        memory/2732-21-0x0000000000710000-0x000000000072C000-memory.dmp

        memory/2732-20-0x00000000002D0000-0x000000000036C000-memory.dmp