I just got the updates for Ultimatebet (it took a while, I haven't played in over a year!) and no viruses were reported.
Often a virus will run and attach itself to some other application. If a virus is attaching to a poker app, my guess is that it came from some type of poker site
or poker tool.
Also, I think Ultimatebet utilizes Internet Explorer. I don't know if that has any implications, but when I clicked on something in the Ultimatebet app, IE popped up and I *never* use IE, so I don't know what's up with that.
Good luck to you. Maybe contact Ultimatebet and find out if anyone else has had a problem. Maybe one of their advertising pages has been hacked and people are being infected through the use of IE.