Variants of the Stratio worm, also known as Stration or Warezov, entered the top 10 malware threats for the first time in October, security experts have revealed.
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October figures from security firm Sophos showed that although Netsky-P was once again the most prevalent malware in circulation, Stratio is on the rise, with several hundred variants on the loose.
Sophos senior security consultant Carole Theriault said, “This is like a new dog employing old tricks. Stratio has made it into the top 10 because it used numerous social engineering tactics and has been aggressively spammed out.”
On some days in October, Stratio variants accounted for more than half of all reported malware, Sophos said. The security firm said the proportion of infected e-mail was still low, at just one in 300, but 3,076 new threats had been identified during October.
Sophos figures showed Netsky-P topping the malware charts, accounting for 15.2% of reports, followed by Mytob-AS with 12.2%. The most prevalent Stratio variant – Stratio-Zip – came in third with 5.7%. But Stratio-AY accounted for another 4.3% of reports.