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Microsoft 'Surprised' by 0.1% Infection Rate

Microsoft have been collecting information from their Malicious Software Removal Tool (MSRT) and their Windows Defender initiative and a recent statistic has 'surprised' them. After adding support for some malware that had been circulating since the middle of last year (a six month delay in recognition), they discovered that 250,000 systems out of the 250 million that had the MSRT installed were infected. While 0.1% does not appear to be a large amount, the raw figures are large. This goes to show that a piece of malicious software does not need to hit a large percentage of vulnerable systems to be numerically successful. Of more interest is the news that CME-24 (Blackmal) is still causing enough infections for 40,000 systems to require cleaning by the tool.

10 April 2006

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