alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Storm/Waledac 3.0 Checkin 1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".htm"; endswith; fast_pattern; http.host; pcre:"/^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/"; http.content_len; byte_test:0,<,10,0,string,dec; classtype:command-and-control; sid:2012137; rev:6; metadata:created_at 2011_01_05, signature_severity Major, updated_at 2024_02_14;)