alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky Related Activity (down)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/"; bsize:1; http.request_body; content:"i=down"; startswith; fast_pattern; content:"&u="; distance:0; content:"&p="; distance:0; content:"&v="; distance:0; http.header_names; content:!"Referer"; reference:md5,447163d776b62bf0b1c652c996cc0586; reference:md5,7e041b101e1e574fb81f3f0cdf1c72b8; reference:url,twitter.com/Timele9527/status/1407610627011403779; classtype:trojan-activity; sid:2033194; rev:1; 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 2021_06_25;)