Fortinet has announced the top 10 most reported high-risk threats for November 2007. The report, compiled from all FortiGate multi-threat security systems in production worldwide, is a service of Fortinet's FortiGuard Global Security Research Team.

November 2007's top 10 threats, as determined by the degree of prevalence are:

Threat Type          % of Detections
· Mass mailer       10.87
· Exploit               8.21
· Trojan               6.60
· Exploit               5.14
· Mass mailer       3.11
· Mass mailer       2.42
· Mass mailer       2.25
· Worm                2.09
· Adware             1.86
· Adware             1.71


"Hacking legitimate site content to host malicious code has become very common. This month, many trusted Internet sites were unwittingly 'hosting' flash advertisements injected with encrypted redirects, forcing users to visit other sites once the ad was displayed. More determined efforts to conceal malware using trusted sources are likely to be made as we enter into the busy holiday season of December," said Derek Manky, security research engineer at Fortinet. "Examples of adware such as Clicker.AC illustrate the trend in what is becoming the blend between malware and grayware and further emphasizes the need for threat awareness, not only from the end user's perspective, but also for corporations and their affiliates."