alert dns $HOME_NET any -> any any (msg:"ET MALWARE Cobalt Strike Infrastructure CnC Domain in DNS Lookup"; dns.query; content:"arctiusa.com"; nocase; bsize:12; reference:url,twitter.com/MichalKoczwara/status/1424685098264301571; classtype:trojan-activity; sid:2033691; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_08_09, deployment Perimeter, deprecation_reason Relevance, malware_family Cobalt_Strike, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_06_26, reviewed_at 2024_06_26;)