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Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Topic started by: we.are.d3d53c on June 07, 2019, 05:39:29 PM

Title: "Behavior Shield" is blocking most applications
Post by: we.are.d3d53c on June 07, 2019, 05:39:29 PM

Running AVAST free on Win 10 x64.
Launching most applications gives an error message reading "The application was unable to start correctly 0xc0000005."
Tried disabling all the shields and the same applications worked fine.
With a little bit of experimentation, I figured out it is the behavior shield causing issues.
Please help know whether it is a bug in the program itself or on my system, and if it is the latter, how I can fix it.
I have already tried uninstalling and reinstalling AVAST using the avastclear utility, but that achieved nothing.

Title: Re: "Behavior Shield" is blocking most applications
Post by: Asyn on June 08, 2019, 06:00:15 AM

- Which version of Avast Free..?
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

Title: Re: "Behavior Shield" is blocking most applications
Post by: we.are.d3d53c on June 20, 2019, 07:13:46 PM

Apologies for the late response. I'm running 19.5.2378 (build 19.5.4444.505) with Virus Definitions version 190620-2.
I got Malwarebytes running concurrently and the only security software I've used on this system is this combination: Avast (free) + Malwarebytes.
However, with trial and error, I've found out that MB is not causing the issue.

Title: Re: "Behavior Shield" is blocking most applications
Post by: schmidthouse on June 20, 2019, 08:16:29 PM

Quote from: we.are.d3d53c on June 20, 2019, 07:13:46 PM

Apologies for the late response. I'm running 19.5.2378 (build 19.5.4444.505) with Virus Definitions version 190620-2.
I got Malwarebytes running concurrently and the only security software I've used on this system is this combination: Avast (free) + Malwarebytes.
However, with trial and error, I've found out that MB is not causing the issue.

Curious, When you say 'trial and error' did that include completely uninstalling Mbam and using the "Malwarebytes Cleanup Utility" to see if there's any change in your issue?

Edit

Title: Re: "Behavior Shield" is blocking most applications
Post by: we.are.d3d53c on June 26, 2019, 02:46:28 AM

I admit it didn't include anything with MB because I started with Avast and turning off the behavior shield did fix the issue. "Trial and error" here really meant trying disabling random shields and seeing if it fixed the issue.
I will try the same with MB and get back.

Title: Re: "Behavior Shield" is blocking most applications
Post by: Asyn on June 26, 2019, 04:51:11 AM

Update to the latest version (19.6.2383): https://forum.avast.com/index.php?topic=228012.0

Title: Re: "Behavior Shield" is blocking most applications
Post by: we.are.d3d53c on June 27, 2019, 01:41:52 PM

Updated Avast; cleaned MB. Still the same.
Turning off the "Behavior Shield" still does fix the issue.

Title: Re: "Behavior Shield" is blocking most applications
Post by: bob3160 on June 27, 2019, 01:45:42 PM

Sounds like a Windows error and problem not Avast. See if this helps:https://blog.pcrisk.com/windows/12778-how-to-fix-application-error-0xc0000005 (https://blog.pcrisk.com/windows/12778-how-to-fix-application-error-0xc0000005)

Title: Re: "Behavior Shield" is blocking most applications
Post by: we.are.d3d53c on July 02, 2019, 05:39:41 AM

sfc /scannow - no errors
Malware scan - clean
Registries fixed (CCleaner)
Drivers updated.

The problem is still there.
Only turning off Avast Behavior Shield seems to resolve it (even if it's just a workaround).

Title: Re: "Behavior Shield" is blocking most applications
Post by: Asyn on July 02, 2019, 05:49:54 AM

Regarding Avast & Malwarebytes, see: https://forums.malwarebytes.com/topic/200324-exclusions-for-avast-users/

Title: Re: "Behavior Shield" is blocking most applications
Post by: we.are.d3d53c on July 02, 2019, 08:11:31 AM

Will try that after I reinstall Malwarebytes.
Currently, I had cleaned MB as instructed above (without reinstalling) and it didn't resolve the issue, so I don't think it's spectacularly likely.

Title: Re: "Behavior Shield" is blocking most applications
Post by: Asyn on July 02, 2019, 08:15:55 AM

Could you provide any examples - which apps get blocked..?

Title: Re: "Behavior Shield" is blocking most applications
Post by: we.are.d3d53c on July 04, 2019, 05:47:25 PM

Due to another bug (not related to Avast), I had to reset my PC, and apparently, the error was indeed related to a corruption in the OS files masquerading as an error with Avast.
The system is now back up and running with Avast & MB as usual.
Thank you to everyone for their time.

Title: Re: "Behavior Shield" is blocking most applications
Post by: Asyn on July 04, 2019, 06:02:42 PM

You're welcome. And thanks for the feedback.