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According to email and internet content security firm Marshal, almost half of spam traffic is generated by Srizbi botnet.

As per latest statistics by Marshal, Srizbi botnet sends 60 billion spam emails a day and has compromised almost a third of a million PCs worldwide. Currently it is the largest botnet and one of the main malware responsible for the global tide of spam, generating 46 percent of all spam traffic.

Srizbi has beaten Storm botnet which at one time was the leader by accounting for 20 per cent of spam. Bradley Anstis, vice president of products at Marshal said:

At its peak, the highly publicised Storm botnet only accounted for 20 per cent of spam. Srizbi now produces more spam than all the other botnets combined.

Srizbi sprang to fame in March when a Marshall report identified it as one of a small group of ’super-bots’ starting to monopolise global internet traffic.

Anstis pointed to the industry-wide success in repressing the Storm botnet, which appeared early last year, as a glimmer of hope in dealing with the new threat posed by Srizbi.

He said:

Microsoft recently announced its success in combating the Storm botnet with its Malicious Software Removal Tool. The challenge now is for the security industry to collectively turn its sights on Srizbi and the other major botnets. We look forward to seeing Microsoft target Srizbi in the near future.

Following are the latest botnet statistics from Marshal.

• Srizbi: 46.1%
• Mega-D: 17.1%
• Rustock: 12.3%
• Pushdo: 5.5%
• Bobax: 4.4%
• Grum: 1.1%
• Others: 13.5%