Constant message "avast web shield has blocked a harmful webpage or file"

[REDACTED]

Every time I go online I keep getting between 10 and 20 messages from avast saying "avast web shield has blocked a harmful webpage or file". It's only started occurring in the last 3 days.

I have scanned my laptop with Avast and Malwarebytes Anti-malware. Malwarebytes showed me some potentially unwanted files which I have deleted, yet the problem still persists.

Does anybody know what the cause might be?

I am running:

 Avast Free Antivirus, program version 2015.10.2.2215

Malwarebytes Anti-Malware 2.1.6.1022 (Free), Database Version v2015.06.12.01

Any information would be greatly appreciated.

Thanks

[TwinHeadedEagle]

Hello,


Scan with Farbar Recovery Scan Tool

Please download Farbar Recovery Scan Tool and save it to your desktop.

Note: You need to run the version compatibale with your system. If you are not sure which version applies to your system download both of them and try to run them.
Only one of them will run on your system, that will be the right version.

• Double-click to run it. When the tool opens click Yes to disclaimer.
  
• Press Scan button.
  
• It will make a log (FRST.txt) in the same directory the tool is run. Please attach it to your reply.
  
• The first time the tool is run, it makes also another log (Addition.txt). Please attach it to your reply.

[REDACTED]

Thanks for your quick reply.

I have attached the requested files.

[TwinHeadedEagle]

Scan with ZOEK

Please download ZOEK by Smeenk and save it to your desktop (preferred version is the *.exe one)
Temporary disable your AntiVirus and AntiSpyware protection - instructions here.

• Right-click on icon and select Run as Administrator to start the tool.
  
• Wait patiently until the main console will appear, it may take a minute or two.
• In the main box please paste in the following script:

Code: [Select]

createsrpoint;
autoclean;
emptyalltemp;
ipconfig /flushdns;b

• Make sure that Scan All Users option is checked.
  
• Push Run Script and wait patiently. The scan may take a couple of minutes.
  
• When the scan completes, a zoek-results logfile should open in notepad.
  
• If a reboot is needed, it will be opened after it. You may also find it at your main drive (usually C:\ drive)

Post its content into your next reply.

[REDACTED]

Thanks for that.

I ran Zoek, but my computer failed to turn back on after restarting. It struggled a few times, one time it said it was preparing to repair automatically.

Once I got it started the log file was open. I came online and Avast blocked another handful of threats.

Anyway, thanks for your help with this. I've attached the log file for you.

[TwinHeadedEagle]

Scan with Farbar Recovery Scan Tool

Please re-run Farbar Recovery Scan Tool to give me a fresh look at your system.

• Right-click on icon and select Run as Administrator to start the tool.
  (XP users click run after receipt of Windows Security Warning - Open File).
  
• Make sure that Addition option is checked.
  
• Press Scan button and wait.
  
• The tool will produce two logfiles on your desktop: FRST.txt and Addition.txt.
  

Please include their content into your next reply.

[REDACTED]

Hey,

I've attached the two files.

Thanks

[TwinHeadedEagle]

Fix with Farbar Recovery Scan Tool

This fix was created for this user for use on that particular machine.
Running it on another one may cause damage and render the system unstable.

Download attached fixlist.txt file and save it to the Desktop:

Both files, FRST and fixlist.txt have to be in the same location or the fix will not work!

• Right-click on icon and select Run as Administrator to start the tool.
  (XP users click run after receipt of Windows Security Warning - Open File).
  
• Press the Fix button just once and wait.
  
• If for some reason the tool needs a restart, please make sure you let the system restart normally. After that let the tool complete its run.
• When finished FRST will generate a log on the Desktop, called Fixlog.txt.
  

Please attach it to your reply.

[REDACTED]

Here's the fixlog.txt

Really appreciate your help with this.

[TwinHeadedEagle]

Good. How is your PC behaving now?

[REDACTED]

It seems okay, I haven't had anymore alerts since I sent you the fixlog.

Any idea what it was/how it happened?

[TwinHeadedEagle]

There was some Adware that injects into Google Chrome preferences. After removing Adware and resetting preferences, problem stopped

Anything else I can help with?

[REDACTED]

No, that's great, I will keep my wits about me in the future.

Thank you very much for your time and knowledge, I really appreciate it.

[TwinHeadedEagle]

Cheers


• The following will implement some post-cleanup procedures:

=> Please download DelFix by Xplode to your Desktop.

Run the tool and check the following boxes below;
Remove disinfection tools
Create registry backup
Purge System Restore
Click Run button and wait a few seconds for the programme completes his work.
At this point all the tools we used here should be gone. Tool will create an report for you (C:\DelFix.txt)

The tool will also record healthy state of registry and make a backup using ERUNT program in %windir%\ERUNT\DelFix
Tool deletes old system restore points and create a fresh system restore point after cleaning.

[REDACTED]

Done.

Once again, thank you.

All the best.