alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Cryptrun.B Connectivity check"; flow:from_client,established; http.method; content:"GET"; http.uri; content:"/search?qu="; fast_pattern; http.header; content:"Content-Length|3a 20|4|0D 0A|"; http.user_agent; content:"Firefox/2.0.0.2"; depth:15; endswith; http.host; content:"www.google.com"; distance:0; bsize:14; reference:url,blog.9bplus.com/kim-jong-il-pdf-malware; classtype:trojan-activity; sid:2014173; rev:5; metadata:created_at 2012_01_31, malware_family Win32_Cryptrun_B, signature_severity Major, updated_at 2020_10_13;)