Dr.Web

Dr.Web is a Russian anti-malware company, and the name of its flagship software suite. First released in 1992, it became the first anti-virus service in Russia.
The software also offers anti-spam solutions and is used by Yandex, Russia's biggest search provider, to scan e-mail attachments. There is also an add-on for Firefox which checks links with the online version of Dr. Web. Dr. Web discovered the Trojan BackDoor.Flashback variant that affected more than 600,000 Macs.