alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious Purported MSIE 7 with terse HTTP Headers GET to PHP"; flow:established,to_server; http.uri; content:".php"; nocase; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 7.0|3b 20|Windows NT 5.1)"; depth:50; endswith; fast_pattern; http.protocol; content:"HTTP/1.1"; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|"; depth:20; content:"Cache-Control|0d 0a 0d 0a|"; distance:0; classtype:bad-unknown; sid:2012384; rev:7; metadata:created_at 2011_02_27, performance_impact Moderate, confidence Medium, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_10;)