how to Block porn, ads, commercial pubs in web browsers of mac book and windows

Hi,

In our company we do have macbook pro, windows clients. Very often users compliant about porn, commercial ads, popping in web browsers suchs ( internet explorer, firefox, google chrome ). When i provide the computers to them everything is good no such kind of popups.
But suddenly where they comes from. I m also using same computer, i don't have these popups.

Someone could explain the reason for these pops appears ? how the users clients get infected ?
And also if some one provide freeware exists to clean these popups and prevent in WINDOWS clients and MACBOOK pro ?
kriiisAsked:
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JohnConnect With a Mentor Business Consultant (Owner)Commented:
The reason for that kind of pop up is that people click on questionable links. I do not get these pop ups either (like you).

I use Internet Explorer and I can turn pop ups OFF and I do turn them off. I think any browser (Chrome, Safari) can do the same.

So in the browser settings, turn off pop ups.

How to people get viruses in their computers?  They click on questionable links. This provides a way for the virus to plant itself in the computer. For this, you need good, commercial antivirus, and good training for people to explain about safe browsing. For modern Windows systems, I use EMET from Microsoft to enhance overall security.

Remember, people are not the hapless victims.

... Thinkpads_User
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Danny ChildIT ManagerCommented:
to block it in a company, you need to look at your firewall and filtering options at the network level.

Here's a decent example.
http://www.netgear.co.uk/business/products/security/UTM-series/UTM9S.aspx

There's no point trying to install something to the PCs and Macs when you can control it at a single point - ie your internet gateway.  You'll have just one place to update, centralised logs, good reporting, and stable end users as well.  

Once installed, you might need to do some cleanup on the clients though....
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JohnBusiness Consultant (Owner)Commented:
While you can block some stuff centrally (and I agree with the above), that does not prevent silly people from clicking on "make my computer run faster" and hosing their computer. That is why you need PC defenses as well.

Also, ANY defense, however implemented, is a rear-guard action (closing the door after the horses have bolted) and so training is essential.

... Thinkpads_User
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COBOLdinosaurConnect With a Mentor Commented:
You can do a limited amount of perimeter filtering at the firewall, but the most dangerous attacks come behind the firewall and the serious hackers can always come through the best firewall.

It is absolutely essential that all local machines have a commercial grade AV a prefer Kaspersky, but there are others.  Without all machines protected by AV it is a 100% certainty that a some point a malicious piece of downloaded content will attack your network from inside.

BTW 80% of serioud network attacks are from inside the network, and initiated by authorized users.  The protection from that requires monitoring of user activity through detailed logging.

Cd&
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Mohammed KhawajaConnect With a Mentor Manager - Infrastructure:  Information TechnologyCommented:
Go to www.opendns.org and sign up.  Assign your IP to the OpenDNS site and then change your DNS servers on the PC to OpenDNS servers.  In OpenDNS you can select what kind of filtering to apply (i.e. block porn sites, etc.).
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jcimarronCommented:
kriiis--
Consider using your HOSTS file as another weapon to prevent infection of the PC's.  
http://www.mvps.org/winhelp2002/hosts.htm
Of course it will be hard to block all the sites that people in your company are accessing, but the hosts.zip file offered on that site will block many (hundreds) of undesirable sites with just a few clicks.
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kriiisAuthor Commented:
Hi guys thanks for your replies.

@jcimarron > i already tried mvps.org, but not really helpful. The pc still gives the pops, porn ads, comercial pubs, when we open the web browser.

Is there any free ware to clean up the infected clients ?
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jcimarronCommented:
kriiis--
Concerning freeware to clean up malware.
The most recommended is probably MalwareBytes.
http://www.malwarebytes.org/products/malwarebytes_free

But that is for home use you will have to pay for business use.

Another would be the antivirus app that should already be on your PC's.  Examples are AVG, Avira and Microsoft's own Security Essentials.  I think the latter is free for anyone.  I have not checked the policy of the others.

Going back to HOSTS, if the number of popups are finite, you can block each by right clicking on the popup, left clicking on Properties and putting the domain name shown in the Address line into the HOSTS file.
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JohnBusiness Consultant (Owner)Commented:
@kriiis - Thanks and I was happy to help you with this.
.... Thinkpads_User
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