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Windows 7: MalwareBytes and Avast ?


18 May 2011   #1

Windows 7 64bit
 
 
MalwareBytes and Avast ?

Hello,

Have a few questions regarding the AV I use, Avast Free:

I did a full system scan, boy, it takes a long time, and it found two
instances of win32:vitro.

Questions:

a. How come it did not prevent this viruse from entering ny system in the
first place ?
I do have all of their "Shields" turned on.

b. I have both instances that it found quaranteed in their "Chest".
It describes this as being a perfectly safe to leave them.
Is it ?

Apparently, there is no option for totally removing it that I can find.
Is there a way to get it out of the Chest, and totally removed ?
Assuming there is somew way, is this better than just leaving in their Chest ? Why ?

c. I also did a Boot scan. How is this different from their Full System Scan ?

d. Their are 2 Users on the PC.
Is it necessary to do the Full System Scan, and the Boot Scan, separately for each User, or it scans everything on the PC, irrespective of which User is logged in ?

Much thanks,
appreciate the help,
Bob

My System SpecsSystem Spec
.

18 May 2011   #2

Windows 7 Ultimate x64
 
 

Hi Bob,

Quote:
How come it did not prevent this viruse from entering ny system in the
first place ?
That's a tough question to answer. It depends on how you got the infection in the first place.

Quote:
Is there a way to get it out of the Chest, and totally removed ?
Assuming there is somew way, is this better than just leaving in their Chest ? Why ?
In the chest it's essentially harmless. There should be an option to delete the quarantined files but there's no reason to if you don't want to.

Quote:
c. I also did a Boot scan. How is this different from their Full System Scan ?
Basically it will perform a scan before the malware has a chance to load.

Quote:
Is it necessary to do the Full System Scan, and the Boot Scan, separately for each User, or it scans everything on the PC, irrespective of which User is logged in ?
Avast scans all user profiles when doing a full system scan
My System SpecsSystem Spec
18 May 2011   #3
Microsoft MVP

 

Now run Full Scan with Malwarebytes
My System SpecsSystem Spec
.


19 May 2011   #4

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x64 SP1
 
 

You can open quarantine and right click the entries, there will be a delete choice. A Guy
My System SpecsSystem Spec
19 May 2011   #5

Windows 7 Ultimate 64 bit
 
 

Quote:
a. How come it did not prevent this viruse from entering ny system in the
first place ?
I do have all of their "Shields" turned on.
It may have entered your system before Avast added it to their virus definitions.
My System SpecsSystem Spec
20 May 2011   #6

Windows 7 64bit
 
 
MalWare Bytes ?

Hello,

Would appreciate your advice as to whether I should purchase the $25
version of MalWare Bytes. It's not the $, it's that I don't want another
"protection" software running and installed if it won't likely do me any good.

History.

I have Avast Free for my AV protection now.
Apparently the virus win32:vitro got into my system.
Avast, therefore, did Not stop it.

I did a full scan with Malware Bytes, and it did Not find the virus.

A Full scan with Avast Did find it, which is somewhat surprising as it did not stop it from entering in the first place; hard to understand.

Any thoughts on ?
Should I purchase and install Malware Bythes ?
How come it missed it when I scanned with it ?

Much thanks for help and opinions; appreciate it.

Bob
My System SpecsSystem Spec
20 May 2011   #7

Windows 7 Ultimate x64
 
 

malwarebytes scans for malware/spyware type stuff, not viruses.

As to how the file got around avast in the first place...perhaps it was on the box when Avast was installed and this was the very first full scan.
My System SpecsSystem Spec
20 May 2011   #8

Windows 7 Ultimate 32bit
 
 

Sorry to disagree but I think you will find that Malwarebytes scans for all types of infections as the name would suggest. "Malware" is a generic term used for all types of malicious code.
My System SpecsSystem Spec
20 May 2011   #9

Windows 7 Ultimate x64
 
 

While malwarebytes does scan for various things, and can find some viruses, that's not what it's intended for, and the malwarebytes site will tell you that you also need to run an AV program as well as their software.

See 2nd post in this thread;
Malwarebyte's Detection - Malwarebytes Forum
My System SpecsSystem Spec
20 May 2011   #10

Windows 7 & Windows Vista Ultimate
 
 

This is the second post I've seen today about Avast detecting win32:vitro. It is either coincidence or a f/p.

If truly infected with win32:vitro another name is Virut. The only safe recovery is backing up your data, format and reinstall the operating system. See miekiemoes' Blog: Virut and other File infectors - Throwing in the Towel?.
My System SpecsSystem Spec
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