That would be my guess. Perhaps it wanted to stay un-detected, and un-reverse engineered as long as possible? It just played the numbers game in terms of time until discovery, and gave Xcode users some respect? Hence deleting itself in the presence of anti-virus software as well?
Haha, yeah, I wrote the sentence as it appeared in my head, realized it was incomplete and would make no sense to anyone, then just kinda slid the rest in....
