The July 2011 Symantec Intelligence Report from Symantec reveals a significant increase in activity related to what may be described as a aggressive and rapidly changing form of generic polymorphic malware. With one in 280.9 emails identified as malicious in July, the rise accounted for 23.7 percent of all email-borne malware intercepted in July; more than double the same figure six months ago, indicating a much more aggressive strategy on the part of the cyber criminals responsible.