alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Pyramid Framework Payload Request (base-clr.py)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/base-clr.py"; endswith; fast_pattern; http.user_agent; content:"Python-urllib"; startswith; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:"authorization|0d 0a|"; http.connection; content:"close"; reference:url,github.com/naksyn/Pyramid; classtype:trojan-activity; sid:2043409; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_01_19, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_28, reviewed_at 2025_10_24;)