alert http $EXTERNAL_NET 26800 -> $HOME_NET any (msg:"ET MALWARE ABCbot CnC Instruction (syn)"; flow:established,to_client; http.content_type; content:"text/plain"; http.response_line; content:"HTTP/1.0 200 OK"; http.header; content:"Connection|3a 20|close"; http.response_body; content:"73796e|7c|"; fast_pattern; startswith; reference:url,blog.netlab.360.com/abcbot_an_evolving_botnet_en; classtype:trojan-activity; sid:2034484; rev:3; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2021_11_17, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_10;)