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ComboFix fighting Trojan horse Agent_r.ATS

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#1 terrapin2012


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Posted 12 January 2012 - 12:58 AM

Hi, Many years ago I got a big help with "HijackThis" from this forum and killed a bad virus in my computer at the time. So thank you guys. Now I come back with a similar problem except this time it appear to be a very stubborn Trojan horse named "Trojan horse Agent_r.ATS". Here is what I have done so far:

AVG reported the "Trojan horse Agent_r.ATS" but can't do anything about it because the file infected C:\Windows\System32\drivers\cdrom.sys is white-listed (critical/system file that should not be removed).

I learned that ComboFix might be able to kill it so I tried. However, it didn't work out as I hoped. It started ok and then after a while it did a reboot. However, no combofix.txt file was produced. After reboot, I logged in and the ComboFix window started dancing: flashing and moving around on the screen every second, and there is no way to stop it. It appears to have entered an infinite loop. Finally I had to log out the account and boot into safe mode. In safe mode, I removed the Combofix directory and then boot into windows. Now the windows works but when I did a scan with AVG again, the "Trojan horse Agent_r.ATS" is still there in the C:\Windows\System32\drivers\cdrom.sys. Back to square one.

So I lost my battle for round 1 with ComboFix. Any suggestions?

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#2 terrapin2012

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Posted 12 January 2012 - 07:34 PM

Ok. Problem solved in round 2. I re-run ComboFix and it worked. It killed Trojan horse Agent_r.ATS and a bunch of other bad stuff. I lost the CDROM for a while and then got it back by upgrading the driver firmware from Sony. Everything works fine now.

I am positively surprised by what ComboFix can do and it now has my full vote of confidence, despite its appearance.

A few tips that might help others:

-backup all important files before running ComboFix.
-It puts out messages in Chinese (or is it just me,or multilingual?)
-Leave it alone once started (no way to stop it either), or any click may cause problems.
-It worked with AVG installed but I had to "Ignore" the AVG functions since AVG doesn't fully exit.
-ComboFix does a very thorough job cleaning. Thanks! :thumbsup:

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