alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS websocket-sharp User-Agent Observed"; flow:established,to_server; http.user_agent; content:"websocket-sharp/"; startswith; fast_pattern; reference:url,github.com/sta/websocket-sharp; classtype:bad-unknown; sid:2053849; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2022_02_01, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_06_25, former_sid 2851038; target:src_ip;)