alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Chroject.B Retrieving encoded payload"; flow:established,to_server; http.method; content:"GET"; http.uri; content:!"."; content:"/en-us/"; depth:7; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)$/R"; content:!"/im/"; http.start; content:"=|20|HTTP/1.1|0d 0a|Accept|3a 20|*/*|0d 0a|"; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; reference:md5,6c8c988a8129ff31ad0e764e59b31200; classtype:trojan-activity; sid:2020746; rev:12; metadata:created_at 2015_03_25, performance_impact Significant, signature_severity Major, updated_at 2024_04_07;)