Hi.
Few days ago, Avast Free Antivirus (version 6) detects two rootkit. I attached screenshot (it’s in spanish).
After detection i reboot PC, but nothing happens, and avast detects again.
I used TDSSKiller and Malwarebites and I do not find anything.
Is it a false warning?, Do I have to worry about?, How do I remove them?
Thank you.
follow this guide and attach the 4 log`s
http://forum.avast.com/index.php?topic=53253.0
Essexboy will then help you tomorrow…
I have done all process, and here is logs information:
Malwarebytes log
Malwarebytes’ Anti-Malware 1.51.2.1300
www.malwarebytes.org
Versión de la Base de Datos: 8192
Windows 6.1.7601 Service Pack 1
Internet Explorer 9.0.8112.16421
19/11/2011 15:24:50
mbam-log-2011-11-19 (15-24-50).txt
Tipos de Análisis: Análisis Rápido
Objetos examinados: 207607
Tiempo transcurrido: 5 minuto(s), 51 segundo(s)
Procesos en Memoria Infectados: 0
Módulos de Memoria Infectados: 0
Claves del Registro Infectadas: 0
Valores del Registro Infectados: 0
Elementos de Datos del Registro Infectados: 0
Carpetas Infectadas: 0
Archivos Infectados: 0
Procesos en Memoria Infectados:
(No se han detectado elementos maliciosos)
Módulos de Memoria Infectados:
(No se han detectado elementos maliciosos)
Claves del Registro Infectadas:
(No se han detectado elementos maliciosos)
Valores del Registro Infectados:
(No se han detectado elementos maliciosos)
Elementos de Datos del Registro Infectados:
(No se han detectado elementos maliciosos)
Carpetas Infectadas:
(No se han detectado elementos maliciosos)
Archivos Infectados:
(No se han detectado elementos maliciosos)
That definitely merits a deeper look I feel
Download and Install Combofix
Download ComboFix from one of the following locations:
Link 1
Link 2
VERY IMPORTANT !!! Save ComboFix.exe to your Desktop
[*]Double click on ComboFix.exe & follow the prompts.
[*]Accept the disclaimer and allow to update if it asks
http://img.photobucket.com/albums/v706/ried7/NSIS_disclaimer_ENG.png
http://img.photobucket.com/albums/v706/ried7/NSIS_extraction.png
[*]When finished, it shall produce a log for you.
[*]Please include the C:\ComboFix.txt in your next reply.
Notes:
Please make sure you include the combo fix log in your next reply as well as describe how your computer is running now
I have already run ComboFix and this is the log.
Service_COMSysAppThis is the one I was concerned about
Are you still gettting the detections ?
Thanks. The system is clean.
Subject to no further problems 
I will remove my tools now and give some recommendations, but, I would like you to run for 24 hours or so and come back if you have any problems
Now the best part of the day ----- Your log now appears clean 
A good workman always cleans up after himself so…The following will implement some cleanup procedures as well as reset System Restore points:
.
Run OTL
[*]Under the Custom Scans/Fixes box at the bottom, paste in the following
:Commands [resethosts] [emptytemp] [Reboot]
[*]Then click the Run Fix button at the top
[*]Let the program run unhindered, reboot the PC when it is done
.
Remove ComboFix
.
[*]Hold down the Windows key + R on your keyboard. This will display the Run dialogue box
[*]In the Run box, type in ComboFix /Uninstall (Notice the space between the “x” and “/”) then click OK
.
http://i1224.photobucket.com/albums/ee362/Essexboy3/Misc%20screen%20shots/CF_Uninstall-1.jpg
.
[]Follow the prompts on the screen
[]A message should appear confirming that ComboFix was uninstalled
.
Run OTL and hit the cleanup button. It will remove all the programmes we have used plus itself.
.
We will now confirm that your hidden files are set to that, as some of the tools I use will change that
[*]Click Start.
[*]Open My Computer.
[*]Select the Tools menu and click Folder Options.
[*]Select the View Tab.
[*]Under the Hidden files and folders heading select Do not show hidden files and folders.
[]Click Yes to confirm.
[]Click OK.
.
http://users.telenet.be/bluepatchy/miekiemoes/images/javaicon.gif
Your Java is out of date. Older versions have vulnerabilities that malware can use to infect your system.
Please follow these steps to remove older version of Java components and upgrade the application.
.
Upgrading Java:
[] Go to this site and click Do I have Java
[] It will check your current version and then offer to update to the latest version
.
SPRING CLEAN
.
To manually create a new Restore Point
[*]Go to Control Panel and select System
[*]Select System
[*]On the left select System Protection and accept the warning if you get one
[*]Select System Protection Tab
[*]Select Create at the bottom
[*]Type in a name i.e. Clean
[*]Select Create
.
Now we can purge the infected ones
[*]GoStart > All programs > Accessories > system tools
[*]Right click Disc cleanup and select run as administrator
[*]Select Your main drive and accept the warning if you get one
[*]For a few moments the system will make some calculations
[*]Select the More Options tab
[*]In the System Restore and Shadow Backups select Clean up
[*]Select Delete on the pop up
[]Select OK
[]Select Delete
.
Now that you are clean, to help protect your computer in the future I recommend that you get the following free programmes:
http://img233.imageshack.us/img233/7729/mbamicontw5.gif
Malwarebytes. Update and run weekly to keep your system clean
.
Download and install FileHippo update checker and run it monthly it will show you which programmes on your system need updating and give a download link
.
It is critical to have both a firewall and anti virus to protect your system and to keep them updated. To keep your operating system up to date visit
.
To learn more about how to protect yourself while on the internet read our little guide How did I get infected in the first place ?
Keep safe 
I have already followed all your advice and instructions.
Thank you again essexboy. 