alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Zeus Bot GET to Google checking Internet connectivity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/webhp"; nocase; http.connection; content:"close"; nocase; http.header_names; content:"|0d 0a|Accept|0d 0a|Connection|0d 0a|User-Agent|0d 0a|"; startswith; content:!"Referer"; reference:url,www.secureworks.com/research/threats/zeus/?threat=zeus; reference:url,lists.emergingthreats.net/pipermail/emerging-sigs/2010-October/009807.html; classtype:command-and-control; sid:2013076; rev:13; metadata:created_at 2011_06_22, signature_severity Major, updated_at 2024_04_14;)