Got a call today, came up as Comcast, I checked the number and it is from Comcast business (we just have an Xfinity residential account with them) saying someone was trying to use our account to access a porn site and thinks our security has been compromised. They had our CLSID number, and had me verify it. They sent me an email to confirm and it was from Xfinity.email@example.com Everything was sounding legit, but when they tried to get me to go to fastsupport.net to help set up a block on the email they said was trying to be hacked my alarms went off and I hung up. (By the way, the email they said was trying to be used was an old prodigy.net email we were trying to phase out). I called Comcast myself, but they were of little help. I am pretty certain this was a scam, again sounded so legit at first with all the info they had on us. Be careful folks. If anyone has any experience with something similar please post.
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@amandita5 wrote: ... I am pretty certain this was a scam ...
It certainly sounds like a "tech support" phone call scam-- see https://www.consumer.ftc.gov/articles/0346-tech-support-scams. Keep in mind that it's easy for scammers to fake their caller ID phone numbers. Windows systems use lots of CLSIDs and it's easy for a scammer to pick one that will be present on any Windows system. Comcast doesn't send email from "@mail.com" addresses. Fastsupport looks to be software used to take over your computer remotely, which is another common step in these cold call "tech support" scams.
For samples of recent scam activity, see https://internetsecurity.xfinity.com/help/alerts/.