alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Common Upatre Header Structure"; flow:established,to_server; http.method; content:"GET"; http.accept; bsize:21; content:"text|2f 2a 2c 20|application|2f 2a|"; fast_pattern; http.header_names; content:"|0d 0a|Accept|0d 0a|User-Agent|0d 0a|"; content:"|0d 0a|Host|0d 0a|"; distance:0; pcre:"/^(?:Pragma|Cache-Control)\x0d\x0a(?:Connection)?\x0d\x0a\x0d\x0a$/R"; http.user_agent; content:!"Mozilla"; within:7; content:!"Taitus"; content:!"Sling/"; classtype:trojan-activity; sid:2018394; rev:9; metadata:created_at 2014_04_16, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_01;)