block a file?

Is it possible to block requests for a file through a cisco pix?  We were told by our isp that we had machines requesting a particular file that is virus related.  Until I can get my av solution under control, I would like to block the request for that file in the firewall.  Is that possible?  the request is on port 80, and for osa.gif

so infected machines are looking for http://variousdomainname/osa.gif

If so, how is this done in a pix IOS 6.3

Thanks!
Scott
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scottman29Asked:
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killbradConnect With a Mentor Commented:
Not possible via PIX.  

Check out Squid proxy with DansGuardian content filtering.  Very useful stuff:

http://www.squid-cache.org/
http://dansguardian.org/
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Scott CSenior Systems EnginerCommented:
Why would you post a like to a potentially virus infected file?

Hopefully a moderator will remove the link immediately.
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scottman29Author Commented:
that's not a real link, that was an example.
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Scott CSenior Systems EnginerCommented:
Ooops.  Sorry.

I should have looked at your stats and realized you would have known better.

Guess I jumped the gun on that one.
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caddladyCommented:
can you resolve the domain name to an IP address and block all outbound to that IP address?
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caddladyCommented:
Something like this:

access-list outbound deny tcp any xxx.xxx.x.x 255.255.0.0 eq www

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scottman29Author Commented:
well, we do have a webfilter.  I blocked it in that.  The webfilter works with the pix...
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pseudocyberCommented:
No, not with the pix.  You can block layer 3 and 4 traffic.  File types is layer 6 & 7.
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