alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky Related Maldoc Activity (HEAD)"; flow:established,to_server; http.method; content:"HEAD"; http.uri; content:".dotm?q=6"; endswith; fast_pattern; http.user_agent; content:"Office"; http.header_names; to_lowercase; content:!"|0d 0a|accept"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,a9b6cf8d8d0a67da4eea269dab16fe99; reference:url,mp.weixin.qq.com/s/og8mfnqoKZsHlOJdIDKYgQ; classtype:trojan-activity; sid:2033598; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_07_28, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_25;)