alert tcp any any -> any 4786 (msg:"ET INFO Cisco Smart Install Protocol Observed"; flow:established,only_stream; content:"|00 00 00 01 00 00 00 01|"; depth:8; reference:url,www.us-cert.gov/ncas/alerts/TA18-106A; classtype:misc-activity; sid:2025519; rev:1; metadata:attack_target Networking_Equipment, created_at 2018_04_20, deployment Perimeter, deployment Internal, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)