alert dns $HOME_NET any -> any any (msg:"ET MALWARE Anchor_DNS Trickbot DNS CnC Command - Sending Data"; content:"|00 00 00 00 00 00 3f 38 39|"; fast_pattern; dns.query; content:"89"; depth:2; pcre:"/^[a-fA-F0-9]{61}\.[a-fA-F0-9]{63}\.[a-fA-F0-9]{63}\./R"; reference:md5,130392209b8b1e4aa37fd5c8da8fa6d5; reference:url,technical.nttsecurity.com/post/102fsp2/trickbot-variant-anchor-dns-communicating-over-dns; classtype:command-and-control; sid:2028880; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_10_18, deployment Perimeter, malware_family TrickBot, confidence Medium, signature_severity Major, tag Trickbot, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_15;)