@ Leen
It is simple
Please look:
https://www.virustotal.com/pl/file/d4bbd86eeb40e825fcbf02cafb1859adf7f90d18a095187740783dfc15364787/analysis/1377643223/
See:
Compilation timestamp 2013-06-05 21:25:24
Obviously malware can change timestamp
So, File such release date of the malware.
Let know, if it is what you mean