alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Lyceum Backdoor CnC Activity M2"; flow:established,to_server; http.uri; content:"/?kind="; startswith; fast_pattern; pcre:"/^[0-9]&(?:index|pi|serv)=/R"; reference:url,www.accenture.com/us-en/blogs/cyber-defense/iran-based-lyceum-campaigns; classtype:command-and-control; sid:2034371; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_11_09, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_11_09;)