alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed NimPlant Server Response (Inbound)"; flow:established,to_client; http.header; content:"|0d 0a|Server|3a 20|NimPlant C2 Server|0d 0a|"; nocase; fast_pattern; reference:url,github.com/chvancooten/NimPlant; classtype:trojan-activity; sid:2044340; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_02_24, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_24; target:dest_ip;)