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)"; startswith; endswith; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|accept"; content:!"|0d 0a|pragma"; content:!"|0d 0a|referer|0d 0a|"; content:"|0d 0a|user-agent|0d 0a|"; startswith; content:"cache-control|0d 0a 0d 0a|"; endswith; classtype:bad-unknown; sid:2012384; rev:9; metadata:created_at 2011_02_27, performance_impact Moderate, confidence Medium, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_06;)