alert dns $HOME_NET any -> any any (msg:"ET MALWARE Commonly Abused Domain in DNS Lookup (gk-stst .ru)"; dns.query; bsize:10; content:"gk-stst.ru"; nocase; reference:md5,20b00b5548df287cc721c9b1df50583c; reference:md5,f3100ed6ed9526289473ecd6af30061e; classtype:trojan-activity; sid:2047722; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_08_24, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_24, reviewed_at 2024_01_29; target:src_ip;)