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Botnet: Cutwail Returns; Overall Spam Increasing

According to M86 Security, the infamous Cutwail botnet (aka PandexMutant and Pushdo) appears to have been reactivated. The security specialists say that in the past few weeks they have registered several waves of HTML emails that were infected with malicious JavaScript and probably originated from Cutwail-infected PCs.

Cutwail had its heyday about five years ago, when it led the botnet activity list with 1.6 million infected computers. However, it lost its top position in the market after hackers intruded into the system and disclosed the names of customers and affiliates.

How a botnet works: 1. A botnet operator sends...

Image via Wikipedia

According to M86 Security, the volume of infected emails was 50 times higher between 23 and 25 January, and three further waves from 6 February were found to be as much as 200 times higher.

Infected emails had subject lines such as “FDIC Suspended Bank Account”, “End of August Statement” and “Scan from Xerox WorkCentre”.

Read More Here: Cutwail botnet back in action

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