alert dns $HOME_NET any -> any any (msg:"ET MALWARE Lyceum Group Activity (DNS)"; threshold:type both, track by_src, count 3, seconds 5; dns.query; pcre:"/^[a-z0-9]{32}/"; content:".defenderlive.com"; endswith; reference:md5,e2919dea773eb0796e46e126dbce17b1; reference:url,securelist.com/lyceum-group-reborn/104586/; classtype:trojan-activity; sid:2033085; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_06_03, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_03;)