This puzzle is the second part of story Ohh, NSA again?. Hope like this story. Here it is:
John got the target, it was Stack. Problem is, it can be Stack Overflow or Stack Exchange.
Another problem is that it doesn't concern NSA. Anyway, next day no attacks were detected on Stack Overflow or Stack Exchange.
Well, after that, John discovered that something strange was happening with NSA system.
This puzzle had multiple variants to solve.
Is the NSA being hacked? If so, how? And why Stack Overflow wasn't attacked?
NSA technicians used flash drives to scan Stack Overflow's servers. On their flash drives they had many tools that were very helpful at scanning. There were also newby's in that team.
Guys in that terrorist cell were joking about how strong the software is they(when they talked about target) used.
After some time John recaptured the terrorist and terrorist's phone was blocked. NSA technicians are trying to decrypt phone data.