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Many spyware / hijackers have their contact mail on one of both domains. Most of the yandex.ru and rambler.ru domains are not considered as valid domains to register on a forum.
And if hey had their mail contacts on hotmail? You'd also add whole hotmail.com? Those sites are most popular web-mail domains on runet, so obviously lots of "bad guys" will use them.
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Note it only takes a second to get them back in if I ever find out anything weird about them....
AFAIK, the only thing the domains could be blamed for is their counters (top100.rambler.ru and top.mail.ru), i never heard about any spyware/hijackers/etc spreaded by them.
Anyway, thanks for your consideration