Winter Vivern, believed to be a Belarus-aligned hacker, attacked European government entities and a think tank starting on Oct. 11, according to an Ars Technica report Wednesday.
Over the weekend, rumors circulated that Signal, one of the most trusted encrypted chat apps on the web, had a pretty bad zero-day vulnerability. The claims, which have now been all but debunked, swiftly caused a panic in the infosec community.