How you manage your signatures

What you do with your signatures that are false positives and fire? Do you use event action filters or you turn off the signature? In some cases, I can see where it would be good to disable this signature. As if you have a DNS box which is patched and are not sensitive to a feat to get noticed by IPS - given that your system is patched and no other boxes are sensitive to the exploit so it seems logical to disable the signature, Yes? But the event action filters set up for signatures as GIS-3030, which, in most cases, it does raise that when the source is outside your network. I want just to make sure Im on the right track. Anyone know of a good site that treats of best practice, administration and policies IPS?

Also how much is will monitor your network internal?

Thank you

When I'm troubleshooting a new alert I can usually 'connect pair packages' if I can put more context autour the alert itself. Although they get correlated in MARCH I use CSM for tuning the sensors and signatures. I'll cross-launch to IDM to pull down of the packet capture, recording descriptive names a little in case I need to see again them later. I also use a large engine netflow (mazu networks) of reporting to see where the PC suspect that happened and then use the tools online as dnsstuff.com, spamhaus DROP lists, Dshield, to see if the IP address is on a block list. This tool (as well as Arbor Networks, Lancope, etc.) also make their own behavior analysis network non-based on signatures and sometimes (not always) something with correlate here also.

After that I get enough information I try to deal with the actions on the sensor itself. Sometimes it takes to fall back on a rule of drop of MARCH, just to rule out false positives or handle specific cases, but I think that its best to maintain the alert occurs first place. Having too many filters gets ugly fast.

You should also be left Cisco Intellishield's service; each sig IPS subscription gives you access to detailed information on the IPS sigs and vulnerabilities that have encouraged the GIS in the first place (for free). Excellent service. I was able to disable a bunch of sigs using it alone.

Good luck.

Tags: Cisco Security

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