regarding malicious domains becoming inactive

["Bhatnagar, Mayank" <mbhatnagar () ipolicynetworks com>]

Hi,

Often we find while analyzing malwares that malicious domains become
inactive after some period of time.

They may be active during initial period of activity, malwares when
executed connecting to these domains, these domains then sending
malicious files....binaries etc.....but just as soon as this information
is being known or the behavior has been captured by IDS/IPS signatures
blocking this domain, soon the domain itself become inactive.

What do you feel should be the responsibility of IDS/IPS solution
providers? I feel keeping track of such domains (live or down) in an
automated manner may be one possibility, keeping a signature for some
time as a measure of protection another. Also maintaining blacklists of
these domains may be helpful.

How should one handle such cases? Any ideas?

Thanks & Regards,
Mayank


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