alert dns $HOME_NET any -> any any (msg:"ET DELETED NOBELIUM (TA421) CnC Domain in DNS Lookup"; dns.query; dotprefix; content:".stonecrestnews.com"; nocase; endswith; reference:url,www.mandiant.com/resources/russian-targeting-gov-business; classtype:domain-c2; sid:2034622; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_07, deployment Perimeter, deprecation_reason Duplicate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_11_18;)