alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Possible MSXMLHTTP Request (no .exe)"; flow:established,to_server; flowbits:set,et.MS.XMLHTTP.no.exe.request; flowbits:noalert; http.uri; content:!".exe"; nocase; content:!".msi"; nocase; content:!".msp"; nocase; http.start; content:"HTTP/1.1|0d 0a|Accept|3a 20|*/*|0d 0a|Accept-Encoding|3a 20|gzip, deflate|0d 0a|User-Agent|3a 20|Mozilla/4.0 (compatible|3b 20|MSIE 7.0|3b 20|Windows NT"; fast_pattern; http.header_names; content:"|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|User-Agent|0d 0a|Host|0d 0a|"; startswith; content:!"Cookie|0d 0a|"; content:!"Referer|0d 0a|"; content:!"Accept-Language|0d 0a|"; content:!"UA-CPU|0d 0a|"; classtype:misc-activity; sid:2022049; rev:8; metadata:created_at 2015_11_09, performance_impact Moderate, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_14;)