alert dns $HOME_NET any -> any any (msg:"ET MALWARE Shuckworm CnC Domain (leonardis .ru) in DNS Lookup"; dns.query; bsize:12; content:"leonardis.ru"; nocase; reference:url,symantec-enterprise-blogs.security.com/blogs/threat-intelligence/russia-ukraine-shuckworm; classtype:domain-c2; sid:2038530; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2022_08_16, deployment Perimeter, malware_family Shuckworm, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_09_17, reviewed_at 2024_09_17;)