Fuzzing HTTP request URl filenames and file extensions using Burp Suite Intruder

The payload marker is placed before the file extension to fuzz filenames (as we can see in the following screenshot):

The payload marker is placed after the filename to fuzz file extensions (as we can see in the following screenshot):

The cool thing about Wfuzz and Burp Suite Intruder is the ability to fuzz multiple payload locations using multiple fuzz vectors.