alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious BITS EXE DL From Dotted Quad"; flow:established,to_server; http.uri; content:".exe"; nocase; content:!".gvt1.com/"; http.user_agent; content:"Microsoft BITS/"; startswith; fast_pattern; http.host; content:!"download.windowsupdate.com"; content:!"download.adobe.com"; pcre:"/^(?:\d{1,3}\.){3}\d{1,3}(?:\x3a\d{1,5})?$/"; classtype:misc-activity; sid:2022858; rev:7; metadata:created_at 2016_06_03, confidence Medium, signature_severity Informational, updated_at 2024_04_13;)