puush on Twitter: "we've received reports of possible malware being sent in disguise of a puush update. for now we suggest closing the puush app (windows only)" If it asks you to update, don't, that and close it and uninstall it.
Title is a bit misleading, puush is not malicious software, it just happened that malware started being shipped with one of its updates. I'm sure the issue will be resolved soon and you can continue using it to your heart's content soon.
