alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Suspicious Shellcode Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/shellcode/"; fast_pattern; startswith; content:".txt"; endswith; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.user_agent; content:"python-requests/"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,8f21b629ef0aa2558962644a4a1605ca; classtype:bad-unknown; sid:2033844; rev:4; metadata:attack_target Client_Endpoint, created_at 2021_08_30, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_26;)