I sign up for the MacKeeper security. Received confirmation from clever bridge/KROMTECH ALLICANCE CORP. Is this legitimate?

Uninstall it.

Follow its uninstallation instructions, which will remove it completely.

It's legitimate in the sense that the confirmation probably came from the developer of "MacKeeper," if that's what you're asking. It's not legitimate in the sense that "MacKeeper" is a fraud and the developer is a scam artist.

Don't have much else to add that hasn't already been mentioned but I would ask for a refund as well.

There are reasons why the MacKeeper perpetrators have been successfully sued and forced to pay refunds. MacKeeper will find "problems" on a brand new machine with a fresh OS.

There is a little more to the lawsuit mentioned in this Discussion. In the past, MacKeeper's distributor, in conjunction with its many marketing affiliates, made certain representations that were alleged to be fraudulent. That led to the basis of a settlement agreement. The company was never forced to do anything, and they explicitly denied any wrongdoing. The parties simply agreed to settle the case for an amount of money. Of course that's typical for such agreements.

MacKeeper's EULA always limited their maximum liability to the product's purchase price, without regard for lost time, data, frustration etc, and the settlement limits individual awards to that amount. In fact, given the number of users affected, it is more than likely they will receive a small fraction of their purchase price. The exact amount will depend on the number of claimants, which cannot be determined before November 30.

The settlement fund is considerably less than 1/10 of MacKeeper's total revenue in the United States alone, according to court filings. As much as one third of that is allocated to attorney's fees. The remainder — minus "administrative costs" — shall be distributed among the affected class members. That's justice.

It is just one example of many products claiming to find problems with your Mac that don't exist, and offering to solve them with the click of a button (plus money). The settlement amount in this case might be exiguous, but similar challenges for products and services exactly like it are possible. They remain extremely popular and lucrative. Not all of them have a business presence in the United States though.

If you purchased MacKeeper subsequent to July 8, 2015, you are not part of the Class, and not entitled to anything.