I often use commandline tools for malware analysis, like for the BASE64/XOR decoding I did in my last diary entry.
Of course, there are alternatives if you prefer to use a tool with a graphical user interface. Like the online tool CyberChef.
Here I’m illustrating how I use CyberChef to decode the obfuscated URL from last diary entry’s sample:
First I drag-and-drop the “From BASE64” operation to the recipe:
Then I provide the obfuscated URL (IDc1O2ltbFs9KCc9JjZbPi5DNSZiNicqbC00ITQsI0YiXCItXjo4V2gqSlY=) as input:
Finally I drag-and-drop the “XOR” operation to the recipe, and provide the key (HCAKSBC2PIUVCB2PI3GILUHGCIUGUYO2F3UC2UY3FO23OUYCF32OYUDHOYGU32FVYUO23GF) as UTF8 text:
Didier Stevens
Senior handler
Microsoft MVP
blog.DidierStevens.com DidierStevensLabs.com
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.