alert dns $HOME_NET any -> any any (msg:"ET RETIRED CopyKittens Cobalt Strike DNS Lookup (cloudflare-analyse . com)"; threshold:type limit, track by_src, count 1, seconds 60; dns.query; content:"cloudflare.analyse.com"; depth:22; nocase; endswith; fast_pattern; reference:url,www.clearskysec.com/wp-content/uploads/2017/07/Operation_Wilted_Tulip.pdf; reference:md5,752240cddda5acb5e8d026cef82e2b54; classtype:targeted-activity; sid:2024497; rev:7; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_07_25, deployment Perimeter, former_category MALWARE, malware_family Cobalt_Strike, performance_impact Moderate, confidence Medium, signature_severity Major, updated_at 2024_09_16, reviewed_at 2024_09_16;)