alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Possible WinHttpRequest (no .exe)"; flow:established,to_server; flowbits:set,et.MS.WinHttpRequest.no.exe.request; flowbits:noalert; http.uri; content:!".exe"; nocase; content:!".msi"; nocase; content:!".msp"; nocase; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; fast_pattern; http.header_names; to_lowercase; content:!"cookie|0d 0a|"; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|accept-language|0d 0a|"; content:!"ua-cpu|0d 0a|"; classtype:misc-activity; sid:2022652; rev:6; metadata:created_at 2016_03_24, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_28;)