Here are the top 10 email- and web-based malware threats for September, according to Sophos. You’ll notice that Netsky and the Pushdo trojan were the dominant email-based malware last month, and IFRAMEs were very popular as a web-based threat.

September 2007 email-based malware threats, according to Sophos:

1. W32/Netsky 29.9%
2. Troj/Pushdo 27.4%
3. W32/Mytob 9.2%
4. W32/Zafi 8.3%
5. Mal/Iframe 6.0%
6. Mal/Behav 4.6%
7. W32/MyDoom 4.1%
8. Mal/Basine 2.5%
9. W32/Bagle 1.4%
10. W32/Traxg 1.2%
Other 5.4%

September 2007 web-based malware threats, according to Sophos:

1. Mal/Iframe 59.5%
2. Mal/ObfJS 17.0%
3. Troj/Decdec 3.7%
4. Troj/Fujif 3.6%
5. Mal/EncPk 1.6%
6. Troj/Iffy 1.3%
7. Troj/Pintadd 1.3%
8. Troj/Psyme 1.0%
9. Mal/Packer 0.9%
10. Troj/Ifradv 0.8%
Other 9.3%