HTML Smuggle with JavaScript

A great way to obtain an intial foothold when doing covert ops is HTML smuggling. The idea is to get the client side to click on an HTML file. This will automatically download a file of choice which will connect back to our C2 Channel.

I used msfvenom to create the payload in raw format then fed this to Sharpshooter which converts the payload to Javascript. I could have used DotNetToJScript do this, however this way is much quicker. Keep in mind from an Opsec perspective, Sharpshooter might be signatured in todays security tools.

I base64 encode our Javascript payload. Then place the payload into a JavaScript Blob into my dropper. This dropper has a base64 decryption routine embedded.