alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Netbounce User-Agent (Netbounce)"; flow:established,to_server; http.user_agent; content:"Netbounce/1.0"; bsize:13; fast_pattern; reference:url,www.fortinet.com/blog/threat-research/netbounce-threat-actor-tries-bold-approach-to-evade-detection; classtype:trojan-activity; sid:2032223; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_03_19, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_19;)