The OS will be unsupported from next month or so anyway. If it were my Mac I'd be inclined to wipe it and start over. Do you need help removing them? Do any sound like contact list harvesters? Sorry you're getting such terrible answers but I don't think many posters here have much experience with Mac malware.

Also, all the mail accounts that are being spoofed as senders are on this particular Mac. The names used are specific to this contacts list, so I am 100% certain that it is this contacts list that is being used. So if santa claus is in the contacts with an email address of and a 'name' of whodjyamaflip then the mail account receives an email addressed to 'Whodjyamaflip' and apparently being sent from I have checked the headers and the ip addresses show that the sender isn't my customer, but some foreign outfit. Every contact in the contacts list is receiving emails from one or other of these mail accounts (eg is apparently sending emails out to everyone on the contacts list, using the first names as configured in the contacts list. There is right through to and am also a contact of this mail user.

They are all contacts in their own right of the various other accounts. The Mac has about 12 email accounts on there.

Viber desktop mac adware