alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY Chisel SOCKS Proxy Startup Observed"; flow:established,from_server; http.stat_code; content:"101"; file.data; content:"SSH-chisel-v3-server"; offset:2; fast_pattern; classtype:policy-violation; sid:2033342; rev:1; metadata:created_at 2021_07_15, confidence High, signature_severity Informational, tag Proxy, tag Tunnel, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_15;)