What do you think "viral news" is?
By definition, "viral news" would be news that has "gone viral" -- that is, it's being shared by thousands of people via social media.
So if you want to find
"viral news," all you have to do is monitor various social media channels to discover trending news topics. That will be your "viral news."
If, on the other hand, you're asking how to create
viral news -- that is, to post something that "goes viral," I'm afraid there's no formula or "how to" that anybody can give you. (There are some who claim they can, but -- to put it as gently as I can -- they're lying.)
What "goes viral" depends on what captures the attention of a critical mass of people. Once enough people find and like something enough to share it with their contacts, some of their contact will share with others, who in turn will share with their
friends, and so on and so forth. That's what "going viral" means.
You can maximize your chances by creating content that's funny, topical, useful, thought-provoking, inspirational, or clever (or, preferably, all or most of these things at once). Then you have to promote it so that enough people see it to get the ball rolling.
But that's no guarantee. Unless enough of the right
people see and share your content, it won't "go viral" even if it's the best content the world has ever seen. (And who the "right people" are varies according to the type of content you've created, the topic and the people you want to reach.) You can increase your chances by promoting higher-quality content, but there's still a large element of luck involved.