Rotating iframes

[James Lay <jlay () slave-tothe-box net>]

I'm not even sure what to call this:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS 
(msg:"INDICATOR-COMPROMISE Rotating iframe redirect"; 
flow:to_server,established; content:"GET"; http_method; 
pcre:"/\x02l[a-z]{4,16}\x3ff[a-z]{4,16}=[0-7]{7}/m"; metadata:policy 
balanced-ips drop, policy security-ips drop, service http; 
reference:url,http://blog.unmaskparasites.com/2013/05/11/rotating-iframe-urls-one-a-minute/; 
classtype:bad-unknown; sid:10000056; rev:1)

Is that pcre too expensive?

James

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