alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Observed Meterpreter Style Request (GET)"; flow:established,to_server; urilen:>70; http.method; content:"GET"; http.header_names; bsize:25; content:"|0d 0a|Host|0d 0a|Cache-Control|0d 0a 0d 0a|"; fast_pattern; http.uri; content:!".php"; content:!".htm"; content:!".asp"; content:!"?"; content:!"&"; content:!"="; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; reference:md5,d765cf358376604b90eba4f5dccb4cea; classtype:bad-unknown; sid:2044228; rev:3; metadata:attack_target Client_Endpoint, created_at 2023_02_16, deployment Perimeter, deployment SSLDecrypt, performance_impact Significant, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03; target:src_ip;)