Nope, one did make a virus. But was it hackteam ???
I think your are mistaking rumors for fact.
WPC also reported on HackingTeam's claims and this is how WPC wrapped up their article:
Again, these are claims being made by HackingTeam and could be completely bogus.
HackingTeam's website is all about marketing, and salesmen will always tell you their product can do anything. Considering that none of the secrity bulletins I follow have mentioned Galileo's ability to remotely infect a Windows Phone (that is the name of HackingTeam's offensive security product), I'll say this is complete BS. If you disagree I'd like to see any evidence to the contrary.
What I think Hackingteam is
actually advertising, is Galileo's ability to eavesdrop on encrypted Skype conversations. That requires that at least one participant uses a system which they can remotely infect. If Galileo can do that, it doesn't matter what the other participants are using. In that sense they can eavesdrop on a Skype conversation to a WP device, however, that doesn't constitute a successful attack against a WP device.