[SQLi]

Introduction
This is a file extension spoofer that I like to refer to as QuickSpoofer. This tool will enable you to spoof the extension of any file with ease. I threw this together at 5AM, so if you run into any errors, any at all, don't hesitate to report them on this thread. This has definitely been done before, but I just felt like I had to re-do it properly.

Things you may want to keep in mind is:

• Don't have the file you're spoofing open in any other program
  
• Don't write the true output extension manually, just select one
  

Screenshots

What it looks like when sent over Skype with settings (.pif, .mp4)

Download
Without further ado, the download link: http://mediafire.com/
And because somebody will eventually ask, and because it's required when releasing software: http://virustotal.com/

[Dismas]

So, basically it changes the filename? This can be done in Linux by simply typing "mv /folder/pdf_file.pdf /folder/pdf_file.gif," although a program might be nice for Windows.

[SQLi]

So, basically it changes the filename? This can be done in Linux by simply typing "mv /folder/pdf_file.pdf /folder/pdf_file.gif," although a program might be nice for Windows.

It has this neat little way of spoofing the extension. It doesn't just rename the file. Let me try to explain.

Okay, so Imagine [8238] representing a character code that makes any text after it appear reversed. I want the .exe extension to look like a normal .mp4 extension. The program inserts the charcter code, and reverses the mp4 extension text, so that it turns out normal, after being reversed twice.

Code:

C:\Path\To\File.exe => Spoof => C:\Path\To\File[8238]4pm.exe

It now looks like mp4 and exe switched position, and there's the final result.

Code:

C:\Path\To\Fileexe.mp4

Edit: and on top of this, you need to overwrite the original file with the new one, as it is impossible to perform a My.Computer.FileSystem.RenameFile() with the character code present in the string.

I hope I explained it clearly enough.

[zebra]

Works like a charm. UI is sleek. Everything is pretty self explanatory. (Y)

[ErroraBorealis]

This is nice, I'd imagine binding a file of the real extension to a virus and having them both run would be perfect.

[Ultimatum]

Don't mean to trash or anything; however, spooking extensions is quite old. :/ It doesn't prevent AV protection, and may make it worse, if used outside of a crypter, extra AV detection.

But good work nevertheless.

[SQLi]

Don't mean to trash or anything; however, spooking extensions is quite old. :/ It doesn't prevent AV protection, and may make it worse, if used outside of a crypter, extra AV detection.

But good work nevertheless.

Spooky extensions.

[Ultimatum]

Spooky extensions.

Das right, scare the AVs away.

[Cyanide and Cynicism]

It has this neat little way of spoofing the extension. It doesn't just rename the file. Let me try to explain.

Okay, so Imagine [8238] representing a character code that makes any text after it appear reversed. I want the .exe extension to look like a normal .mp4 extension. The program inserts the charcter code, and reverses the mp4 extension text, so that it turns out normal

ok, that's cool. except that it's completely fucking useless.

[ErroraBorealis]

ok, that's cool. except that it's completely fucking useless.

Because everybody would rather run an EXE than open a JPG or DOC. /sarcasm