Interesting reading.
For those interested here is the link to the BitDefender report with detail
[url=http://www.bitdefender.com/VIRUS-1000239-en--Trojan.Qhost.WU.html]http://www.bitdefender.com/VIRUS-1000239-en--Trojan.Qhost.WU.html
[/url]
Appears to affect Googles AdSense by placing a redirect in a users computers hosts file when they click on a infected ad on google or a regular website with Google AdSense ads.
You can check your hosts file by running this ping command from the command line in windows:
To check if you are affected, you should issue the following command (from the command line or from Start -> Run):
ping -t pagead2.googlesyndication.com
(use ctrl break to stop the ping or ctrl c to stop the ping and exit
The response should look similar to this:
Pinging pagead.l.google.com [6x.xxx.xxx.xxx] with 32 bytes of data:
where the x's represent digits. If you are not infected, the first digit will be a 6 (as in the example). If you are infected, the first digit will be a 9.
I think that google may have changed server ip addresses as I was getting 74.125.47.164 returned on the ping which is in a google server range of 74.125.0.0 - 74.125.255.255 according to a whois result.
You can check your hosts file for a redirect by opening the windows host file located in
C:\WINDOWS\system32\drivers\etc in a text editor.
If you see entries that you or Spybot S&D did not put there such as:

.

.

.

ebay.com
Where

.

.

.

is some set of four numbers, you should probably REMOVE this entry as spyware is trying to redirect your access from ebay.com to another website. The same would go for being redirected to any site from your hosts file, if it looks fishy then get rid of it.
A visual inspection on my hosts file showed just the localhost line.
Please make a backup of your hosts file before trying to edit it.
Spybot S&D if you use that can also lock your hosts file and if it is locked you may not be able to edit it until you unlock it.
This information was gathered from a number of sources and from my own computer. Your mileage may vary.
Sources of information:
Google search
http://www.news.com.au/technology/story/0,25642,22959118-5014111,00.html (News.com.au)
http://www.webpronews.com/topnews/2007/12/19/trojaned-google-ads-attacked (Web Pro News)
[url=http://www.bitdefender.com/VIRUS-1000239-en--Trojan.Qhost.WU.html[/urll] (BitDefender)
[url]http://whois.domaintools.com/74.125.47.165]http://www.bitdefender.com/VIRUS-1000239-en--Trojan.Qhost.WU.html[/urll] (BitDefender)
http://whois.domaintools.com/74.125.47.165 (Whois result for ip address returned by ping on my computer)
Windows path to hosts file C:\WINDOWS\system32\drivers\etc (Looked up on my computer Win XP system, may be different location on other versions of windows)
mijji, I just thought my previous posting came across a little rough in tone and did not want it taken the wrong way by anyone.
_________________
Phil D
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