alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky Operation Blue Estimate CnC Activity"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"|22 3b 20|filename=|22|"; content:"_log.txt|22 0d 0a|Content-Type|3a 20|application/octet-stream|0d 0a 0d 0a|0010::20"; fast_pattern; distance:12; within:62; reference:url,blog.alyac.co.kr/2645; classtype:command-and-control; sid:2029222; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_01_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Kimsuky, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_01_02;)