alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE WSF/JS Downloader Jan 30 2017 M1"; flow:to_server,established; urilen:>65; http.uri; content:"/counter/?"; fast_pattern; depth:10; content:"a="; content:"i="; pcre:"/[&?]i=[A-Za-z0-9_-]{50,}(?:&|$)/"; pcre:"/[&?]a=(?:[a-zA-Z0-9_-]{25,}|(?:0\.)?\d+)(?:&|$)/"; http.user_agent; content:"MSIE 7.0"; http.header_names; content:!"Referer|0d 0a|"; content:!"Cookie|0d 0a|"; reference:md5,852cbd70766feb96923a79b210e94646; classtype:trojan-activity; sid:2023816; rev:4; metadata:created_at 2017_01_31, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_04;)