@All,
like so many others, I have the following problem:
Everytime I start firefox and open a new tab avast pops up, stating it blocked a danger.
I already ran Malewarebytes and adwcleaner with no successful outcome. You help would be more than welcome :-).
Thanks in advance!
Cheers,
David
Attach your basic diagnostic logs. (MBAM, FRST and aswMBR)
Instructions: https://forum.avast.com/index.php?topic=53253
Thank you for the fast reply. Please find the logs attached.
OK, now you’ve to wait a bit…
Could you screen shot the alert please
McAfee is also running one of the AV’s must be uninstalled
I just uninstalled McAfee. Also find attached the avast alert.
Do you have the same alert with both Chrome and IE ?
CAUTION : This fix is only valid for this specific machine, using it on another may break your computer
Open notepad and copy/paste the text in the quotebox below into it:
CreateRestorePoint: 2016-05-10 18:15 - 2015-12-15 18:12 - 00000000 __SHD C:\Users\David\AppData\Local\EmieUserList 2016-05-10 18:15 - 2015-12-15 18:12 - 00000000 __SHD C:\Users\David\AppData\Local\EmieSiteList Reg: reg delete HKLM\SOFTWARE\Policies\Microsoft\Windows\IPSec\Policy\Local /f Reg: reg add HKLM\SOFTWARE\Policies\Microsoft\Windows\IPSec\Policy\Local /f RemoveProxy: EmptyTemp: CMD: bitsadmin /reset /allusers
Save this as fixlist.txt, in the same location as FRST.exe
https://dl.dropboxusercontent.com/u/73555776/FRSTfix.JPG
Run FRST and press Fix
On completion a log will be generated please post that
The alert just goes off in firefox. Should I still proceed with your suggestion?
Yes please, so Chrome and IE are unaffected ?
I never use IE and Chrome. I tried them, and they are unaffected. Please find attached the new logs.
OK next step then will be to test Firefox in safe mode
Switch Firefox to safe mode https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode and let me know if that stops the alerts
I just opened firefox in safemode (shift+clicking on firefox). the alerts are still coming, when I open a new tab.
OK that means that Firefox itself is infected
Follow the steps here please http://kb.mozillazine.org/Profile_folder_-_Firefox
I had no problem opening up the “Profile-Folder”. However, I don’t understand, what the next steps are.
Do I have to create a new profile?
“You can select a profile to use, create a new profile, and delete or rename an existing profile using the Profile Manager. Profiles can become corrupted, in which case you need to create a new profile then transfer your data and settings to the new profile. To safeguard your important data you should make a backup copy of up your profile.”
No basically you need to rename the profile folders then uninstall Firefox then re-install
Good morning,
I changed my profile name from “default - 1463050592716” to “default - 1463050592717”. Then I uninstalled and reinstalled Firefox. Avast still alerts with every tab-opening.
Ands still just firefox ? I will have a think on this
Well, that is strange. It stopped now. Absolutely no idea why.
Any tipps to prevent this from happening again?
Thank you very much!
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 
Remove tools
Download and run Delfix
Select the options as shown
https://dl.dropboxusercontent.com/u/73555776/delfix.JPG
: Keep Java Updated :
WARNING: Java is the #1 exploited program at this time. The Department of Homeland Security recommends that computer users disable Java
See this article
I would recommend that you completely uninstall Java unless you need it to run an important software.
In that instance I would recommend that you disable Java in your browsers until you need it for that software and then enable it. (See How to diasble Java in your web browser and How to unplug Java from the browser)
If you do need to keep Java then download JavaRa
Run the programme and select Remove Java Runtime. Uninstall all versions of Java present
Once done then run it again and select Update Java runtime > Download and install Latest version
https://dl.dropboxusercontent.com/u/73555776/javara.JPG
Now that you are clean, to help protect your computer in the future I recommend that you get the following free programmes:
CryptoPrevent install this programme to lock down and prevent crypto ransome ware
https://dl.dropboxusercontent.com/u/73555776/CryptoPrevent.JPG
Update and run weekly to keep your system clean
Click on the link above to be taken to Unchecky.com
click the very large Download button.
click Save
Click Open folder
Right click on the Unchecky_setup and choose to Run as Administrator
Once open click the Install button.
Then click on Finish
Unchecky is now installed and will help you keep unwanted check boxes unchecked, this is a fire and forget programme 
It is critical to have both a firewall and anti virus to protect your system and to keep them updated.
To learn more about how to protect yourself while on the internet read this little guide Best security practices Keep safe 