Suppose we figured out that the target system was running Skype. Metasploit offers a great module to fetch Skype passwords using the skype module:
Gathering Skype passwords
Get Mastering Metasploit - Third Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.