alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Linux/LuaBot CnC Beacon"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/bot?bid="; depth:9; http.header_names; content:!"User-Agent|0d 0a|"; content:!"Accept"; content:!"Referer|0d 0a|"; reference:url,blog.malwaremustdie.org/2016/09/mmd-0057-2016-new-elf-botnet-linuxluabot.html; classtype:command-and-control; sid:2023155; rev:3; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2016_09_06, deployment Perimeter, deployment Datacenter, malware_family Linux_LuaBot, signature_severity Major, tag c2, updated_at 2020_07_27, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)