Cyber Security Lab
IT Security & IT Forensics Examples

Web Forensics

JavaScript Downloader

This exercise is about starting a download with JavaScript. This allows a file to be started for download without logging a request to the server.


Analyse the first task (Exercise A). To do this, evaluate the communication with the server. How is the download started? What are the differences in the tracks compared to normal downloads?

The file of the second task (Exercise B) uses a special signature. What is it about?

Then go through the next trainings. Which method is used to obfuscate the downloads?

Exercise F: Spam Downloads

Solution of the exercise

Download the file "test.txt" without an additional connection to the server. The function is called in an endless loop.