6 Replies Latest reply on Oct 10, 2008 9:19 AM by tonyb99

    VS 8.5i Exclusions for XP and Vista


      I'm working on a VirusScan 8.5i implementation, and I'm wondering what sort On Access exclusions you all are adding for Windows XP and Windows Vista clients. This is what I had in mind:

      On Access Scan Exclusions:
      - Windows file protection
      - C:\windows\softwaredistribution\datastore\datastore.edb
      - C:\windows\softwaredistribtion\datastore\logs\edb*.log
      - McAfee Common Management Agent logs:
      - C:\Documents and Settings\All Users\Application Data\McAfee\Common Framework\AgentEvents\*.evt
      - C:\Documents and Settings\All Users\Application Data\McAfee\Common Framework\AgentEvents\*.tmp
      - C:\Documents and Settings\All Users\Application Data\McAfee\Common Framework\AgentEvents\*.xml
      - C:\Documents and Settings\All Users\Application Data\McAfee\Common Framework\AgentEvents\*.txml
      - All .JAR files (we have had performance issues in the past scanning .jar files with VirusScan 8.0i)
      - Files within C:\Program Files\McAfee\Common Framework
      - Files were date modified of file > x days ago, where the on demand scanner runs every x days.
      - Do not scan inside of archives (besides zip, what else is considered an archive?)

      On Demand Scan Exclusions (not sure how often this should be run, currently, it is weekly):

      One of the concerns I have is the .jar file exclusion, but we've had some performance issues with these types of files in the past.

      Your thoughts would be appreciated. Thanks.
        • 1. RE: VS 8.5i Exclusions for XP and Vista
          We also had problems with jar files, dating way back to my predecessor and the 7.x days. Now at 8.5, we still exclude jar and js? basically because "its what we've always done". That reasoning bugs the heck out of me, but our corporate "culture" makes it extremely hard to change such a situation. (Its working, so leave it alone. Why don't you just test the changed settings? Oh, I'm way too busy to actually test my programs with your new settings. etc.etc. Sorry, end of rant:D)

          So, I'd be interested to hear if 8.5 has fared any better with jar files, too.
          • 2. RE: VS 8.5i Exclusions for XP and Vista
            The problem with .jar files is that they are encrypted and thus take a long time to scan even if your scan time out is low it will cause performance deterioration. My default process policy states not to scan archived files. This allieveated lots of performance issues. I find the risk is mitigated because once the file is unzipped and executed it will be scanned again and the malware would be discoverred.

            I dont exclude any folders.

            I exlude certain executables that were falsely being identified as Malware.

            With 8.5i and above you can exclude folders from scanning on read or write. I suggest if you must exclude a folder, then only exclude on read, that way you will catch anything that attempts to write/overwrite that folder.
            • 3. RE: VS 8.5i Exclusions for XP and Vista

              Thanks. In the VirusScan 8.5i course I took, the book does say that there are two ways of dealing with performance issues with .jar files. One to turn off on access scanning for archives (as you suggest), and the other is to exclude all .jar files. So if we turned off scanning archives, besides .JAR, .CAB, and .ZIP, what other archives would be excluded?

              The one thing that concerned me in the book was the statement that Sun and Microsoft Java Virtual Machines do NOT write files to disk when .JAR files are unpacked, so any virus infected Java files would not be caught by the On Access scanner. Is this really the case?
              • 4. RE: VS 8.5i Exclusions for XP and Vista
                Pretty much. If you say dont scan this... It wont, and without a scan it wont make a detection. We decided the risk was acceptable. Every ogranization will need to decide that for themselves. Aside from that java uses more than just .jar files. You will find even with .jar excluded applications that use java will continue to be slow with archive scanning enabled.

                If your company uses a lot of java apps. I would recommend disabling archive scanning. It also helps as you said with .cab etc for installing various windows componants including SMS.

                In my experience SMS is dog slow, even with the named componants being excluded.
                • 5. RE: VS 8.5i Exclusions for XP and Vista
                  I would at least keep archive scanning on in scheduled scans, its invaluable in picking up all those packed trojans from various torrents and keygen files
                  • 6. RE: VS 8.5i Exclusions for XP and Vista

                    Nope it hasn't.
                    I've been fighting developpers off my phone and office because compiling slows down to a crawl in some cases.

                    So I created specific subgroups for developpers and for those I don't scan JAR, EAR, .class and other files. But I do weekly scans including those...
                    For most cases, skipping scans on Read was enough but I've got a group of developpers who still get performance issues and for those I also excluded scans on writing the files.


                    Edit : here's a link to another thread where someone asked about specific exclusions for SERVERS, and I put a link to MSFT's KB