And even without that it was pretty obvious who the attackers were given the released data: 1) Focus on US athletes 2) Bear mentioned in name of hackers 3) F

And even without that it was pretty obvious who the attackers were given the released data: 1) Focus on US athletes 2) Bear mentioned in name of hackers 3) Focus on sports doping (which Russia was recently found guilty of) Now I know that many hacks and hackers will obfuscate the trail to them as much as possible but this is a fairly basic attack with little in the way of real impact as a result of the releases. It was obvious even to a non-security professional that the most likely culprits were russian nationalist hackers.