alert dns $HOME_NET any -> any any (msg:"ET MALWARE LYCEUM CnC Domain in DNS Lookup"; dns.query; dotprefix; content:".micrsoftonline.net"; nocase; endswith; reference:url,www.accenture.com/us-en/blogs/cyber-defense/iran-based-lyceum-campaigns; classtype:domain-c2; sid:2034378; 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 LYCEUM, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_11_09;)