Symantec tracked the decline of the Flashback botnet - from 600,000 Macs last week to 380,000 as of Tuesday to 270,000 yesterday - by using the same intelligence-gathering tactic as the one deployed by two Russian security companies who came up with separate estimates of the Flashback infection.įlashback includes a domain-generation algorithm that tells the malware where to look for commands each day, a common technique by bot makers. ![]() "I think what's probably contributing to the decrease in numbers is the awareness of the malware," said O Murchu, referring to the scores of news stories and blog posts that have run since April 4, when a Russian security company announced Flashback had infected more than half a million Macs.Įven so, O Murchu said Symantec had no definitive proof of why the botnet was shrinking, only suspicions.
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