In its Top Ten E-Threats, BitDefender says that pole position during the month was taken by trojan.Clicker (10.98%), probably due to its regained popularity as an infection tool of choice among purveyors of compromised pirate software.

Second place in the September chart was Wimad trojan (9.58%), a generic detection for Autorun-using trojans, whilst in third place was the Clicker adware trojan (5.52%).

Interestingly, Conficker, in its various guises,was detected by BitDefender as Win32.Worm.Downadup.Gen (4.68%) and occupies the fourth spot in the September e-threats chart. Conficker is due for its first anniversary in November, Infosecurity notes.

Another exploit - Exploit.PDF-JS.Gen (4.09%) - this time using a vulnerability in the way some versions of the Adobe PDF reader parse embedded javascript - is gaining popularity again and can be found at number five.

At number six, BitDefender says that trojan.Exploit.JS.Y (3.44%) is a malicious piece of javascript, usually found on compromised or malicious websites.

A long-time veteran of BitDefender's top ten, Win32.Sality.OG (2.75%) dropped from fifth to seventh place in the September chart. This encrypted, polymorphic file infector seems set for a very long cybercrime, says the IT security vendor.

Two threats using the Autorun security loophole in older versions of Windows occupy the following two positions.

Interestingly enough, says BitDefender, the lower-spreading of the two threats is actually a downloader component used to spread the well-known Conficker worm.

And finally, in at number ten on BitDefender's Top Ten E-Threats list for September is trojan.Skintrim.HTML.A, a type of HTML page usually found associated with adware programmes such as Navipromo.