I've received an email from firstname.lastname@example.org with a warning about a device on my home network potentially having malware:
"Our reference: VMIS5-MALWARE-F008407148"
"To protect our customers, we work with a number of not-for-profit organisations that gather information about internet connections that appear to be at risk of things like malware infections. On11 September 2020, one detected that gumblar, a piece of malware, was present on a device using your internet connection."
To my understanding Gumblar is a trojan from 2009 which targets devices with older Windows OSs, i.e. pre-Windows 7. None of the devices on my network have these OSs, however despite this I have run checks on all Windows devices using both antivirus software and Malwarebytes, and all came up negative for Gumblar.
Is this email legitimate, and if so, could it be a false positive given that multiple anti-malware scans have turned up nothing? Could my works VPN have anything to do with it since those have been known to trigger false positives?
Adding another warning received post here rather than starting a new thread. I've just received the second warning about this issue, all devices are running Win 10 and have been swept with AV and Malware software and I've done a factory reset on the router. I am running the router in modem mode and using a Linksys router.