alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky Related Activity (GET)"; flow:established,to_server; http.request_line; content:"GET|20|/?d="; fast_pattern; http.uri; pcre:"/^\/\?d=[a-f0-9]{16}$/"; http.header_names; to_lowercase; content:"|0d 0a|ua-cpu|0d 0a|accept-encoding|0d 0a|"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,447163d776b62bf0b1c652c996cc0586; reference:md5,7e041b101e1e574fb81f3f0cdf1c72b8; reference:url,twitter.com/Timele9527/status/1407610627011403779; classtype:trojan-activity; sid:2033196; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_06_25, deployment Perimeter, malware_family Kimsuky, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_25;)