alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious Request for Doc to IP Address with Terse Headers"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".doc"; fast_pattern; nocase; endswith; http.host; pcre:"/^(?:\d{1,3}\.){3}\d{1,3}$/"; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; endswith; classtype:bad-unknown; sid:2025162; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_21, deployment Perimeter, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17;)