Possible Browser Hijak?

I have a user who's computer constantly tries to call out to www.ajaxcdn.org/swf.swf.  This is blocked by our firewall claiming that destination is a threat: "Threat (Mal/HTMLGen-A)".  This will also happen several times a minute at some points, then go for an hour or so where there are no calls at all.  

I've ran the typical scans, Malware Bytes, SAS, ADWCleaner, Norton, Spybot, and everything is coming back clean at this point.  Cleaned all of the browser(s) cache, deleted temp files of everything, but this still calls out.  Has anyone seen this before?  Is this caused by something normal or not normal?  It's only this one pc out of a couple hundred that do this.
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Have you looked at the Control Panel Add/Remove programs to see if there is a stranger lurking in there?

The security apps you ran are solid, but have you tried RogueKiller (RK) or ComboFix?
Detailed RK instructions here:

http://www.experts-exchange.com/A_4922.html Rogue-Killer-What-a-great-name

Please download ComboFix by sUBs:(and attach the resulting log)

Now STOP all your monitoring programs (Antivirus/Antispyware, Guards and
Shields) as they could easily interfere with ComboFix.
Double click combofix.exe & follow the prompts.
When finished, it will produce a log. Please save that log and attach it in your
next reply by pasting it in the "Code Snippet" or "Attach File" window.
Re-enable all the programs that were disabled during the running of ComboFix..

Do not mouse-click combofix's window while it is running. That may cause it to stall.
CF disconnects your machine from the internet. The connection is automatically
restored before CF completes its run. If CF runs into difficulty and terminates
prematurely, the connection can be manually restored by restarting your machine.
If needed, here's the Combofix tutorial which includes the installation of the Recovery Console:

*** NOTE
Please post the logs generated for ComboFix so that we can
review the results.
Just adding to younghv's good post.

I would try TDSSKiller from Kaspersky.  

Click on "How to disinfect a compromised system"
then on tdsskiller.exe

Download and run it.

If you try this on the infected computer it may not get to the site.  If that is the case, download it on a different computer and copy it over.

It is very quick to run and very good at finding certain hijackers.  It is NOT as thorough as what was recommended above but it is so quick that it is an excellent first step.

If it does find something, have it remove it, reboot, then run it again to make sure it is gone.  Don't stop there, though.  Follow up with younghv's suggestions to be more thorough.
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PostQAuthor Commented:
Yes I looked through the Control Panel, didn't find anything unusual.  TDSSKiller didn't find anything.  I will attach the ComboFix Log.  Didn't find any toolbars.
PostQAuthor Commented:
Here is a sample of the firewall log from this machine.  The first URL is the one that's being called to/blocked, the second one is the one it's calling from.  This seems to not matter what the website is, it will try calling from eBay, google, all sorts of places.  I purposefully put spaces in the blocked URL so that it won't be clickable.  Here's the sample:

9/11/2013 10:54:27 AM      DOMAIN\user      PCName       www .ajaxcdn. org/swf.swf       Block      Threat (Mal/HTMLGen-A)       www.ebay.com
Sudeep SharmaTechnical DesignerCommented:
Combofix has done may deletion and fixes. See below:

(((((((((((((((((((((((((((((((((((((((   Other Deletions   )))))))))))))))))))))))))))))))))))))))))))))))))
c:\program files (x86)\AutocompletePro
c:\program files (x86)\AutocompletePro\AcRemoteUpdate.exe
c:\program files (x86)\AutocompletePro\AutocompletePro.dll
c:\program files (x86)\AutocompletePro\InstTracker.exe
c:\program files (x86)\AutocompletePro\support@predictad.com\chrome.manifest
c:\program files (x86)\AutocompletePro\support@predictad.com\chrome\content\browserOverlay.xul
c:\program files (x86)\AutocompletePro\support@predictad.com\chrome\content\options.js
c:\program files (x86)\AutocompletePro\support@predictad.com\chrome\content\options.xul
c:\program files (x86)\AutocompletePro\support@predictad.com\chrome\content\utils.js
c:\program files (x86)\AutocompletePro\support@predictad.com\defaults\preferences\predictad.js
c:\program files (x86)\AutocompletePro\support@predictad.com\install.rdf
c:\program files (x86)\AutocompletePro\TaskScheduler.dll
c:\program files (x86)\AutocompletePro\unins000.dat
c:\program files (x86)\AutocompletePro\unins000.exe
c:\programdata\Microsoft\Windows\Start Menu\Programs\ccontineuetoSSaave
c:\programdata\Microsoft\Windows\Start Menu\Programs\ccontineuetoSSaave\ccontineuetoSSaave.lnk
c:\programdata\Microsoft\Windows\Start Menu\Programs\ccontineuetoSSaave\Uninstall.lnk
c:\programdata\Microsoft\Windows\Start Menu\Programs\ConetInUyetyOsaavvea
c:\programdata\Microsoft\Windows\Start Menu\Programs\ConetInUyetyOsaavvea\ConetInUyetyOsaavvea.lnk
c:\programdata\Microsoft\Windows\Start Menu\Programs\ConetInUyetyOsaavvea\Uninstall.lnk
(((((((((((((((((((((((((((((((((((((((   Other Deletions   )))))))))))))))))))))))))))))))))))))))))))))))))

And here:
- - - - ORPHANS REMOVED - - - -
Toolbar-10 - (no file)
Notify-SDWinLogon - SDWinLogon.dll
BHO-{C1ED9DA0-AFD0-4b90-AC6A-D3874F591014} - c:\progra~2\SEARCH~1\Datamngr\x64\BROWSE~1.DLL
Toolbar-10 - (no file)
HKLM-Run-SynTPEnh - c:\program files (x86)\Synaptics\SynTP\SynTPEnh.exe
AddRemove-AutocompletePro2_is1 - c:\program files (x86)\AutocompletePro\unins000.exe
.- - - - ORPHANS REMOVED - - - -

We would still need some work to do, before that I would recommend you to disable or uninstall the various anti-virus, anti-spyware that you have installed and running.

As per the Combofix logs you have:
AV: Sophos Anti-Virus *Enabled/Updated* {65FBD860-96D8-75EF-C7ED-7BE27E6C498A}
FW: Sophos Client Firewall *Enabled* {5DC05945-DCB7-74B7-ECB2-D2D780BF0EF1}
SP: Sophos Anti-Virus *Enabled/Updated* {DE9A3984-B0E2-7A61-FD5D-409005EB0337}
SP: Spybot - Search and Destroy *Enabled/Updated* {9BC38DF1-3CCA-732D-A930-C1CA5F20A4B0}
SP: Windows Defender *Enabled/Outdated* {D68DDC3A-831F-4fae-9E44-DA132C1ACF46}

Uninstall Spybot -Search and Destroy, stop the Windows Defender Services and stop the Sophos Anti-Virus Services.

Re-ran the Combofix and post the logs.

Sudeep Sharma
PostQAuthor Commented:
A combination of MalwareBytes, Sophos, and SAS seemed to do the trick, for now.

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PostQAuthor Commented:
No other person was able to solve the problem.
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