alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky Related CnC Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:!"naver.com"; content:"naver"; fast_pattern; pcre:"/\.php\?[a-z]{3}=(baby|child|adult)/i"; content:"&user="; http.header; content:"Connection|3a 20|Keep-Alive"; nocase; http.header_names; content:!"Referer"; reference:url,github.com/eset/malware-ioc/tree/master/kimsuky/hotdoge_donutcat_case; classtype:trojan-activity; sid:2034692; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_13, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_12_13;)