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Antivirus testing outfit: Microsoft Security Essentials makes the grade

Rivals ding the free antivirus software, but AV-Test.org says it's 'very good'

By Gregg Keizer
June 24, 2009 11:42 AM ET

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Computerworld - Microsoft's free security software passed a preliminary antivirus exam with flying colors, an independent testing company said today.

AV-Test GmbH tested Microsoft Security Essentials, the free software Microsoft launched yesterday in beta, on Windows XP, Vista and Windows 7, putting it up against nearly 3,200 common viruses, bot Trojans and worms, said Andreas Marx, one of the firm's two managers. The malware was culled from the most recent WildList, a list of threats actually actively attacking computers.

"All files were properly detected and treated by the product," said Marx in an e-mail. "That's good, as several other [antivirus] scanners are still not able to detect and kill all of these critters yet."

AV-Test also measured Security Essentials against a set of in-house false positives to see whether the software mistakenly fingers legitimate files, a nightmare for users, who can be left with a crippled computer, and a disaster to the reputation of a security company.

"None of the clean files were flagged as being malicious," noted Marx. "Very good."

AV-Test also examined the program's anti-rootkit skills and its ability to scrub a system of malware it finds with a limited number of samples and "found no reasons to complain," Marx said. "[Security Essentials] is able to remove found malware very well, …

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