alert dns $HOME_NET any -> any any (msg:"ET RETIRED ISMAgent DNS Tunneling (microsoft-publisher . com)"; threshold:type limit, track by_src, count 1, seconds 60; dns.query; content:"microsoft-publisher.com"; depth:23; nocase; endswith; fast_pattern; reference:md5,a70a08a1e17b820c7dc8ee1247d6bfa2; reference:url,researchcenter.paloaltonetworks.com/2017/07/unit42-oilrig-uses-ismdoor-variant-possibly-linked-greenbug-threat-group/; classtype:trojan-activity; sid:2024504; rev:8; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_07_28, deployment Perimeter, former_category MALWARE, malware_family Ismdoor, performance_impact Moderate, signature_severity Major, updated_at 2024_09_16, reviewed_at 2024_09_16;)