alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky Related Host Data Exfil"; flow:established,to_server; http.uri.raw; content:"&p1="; pcre:"/^[a-z0-9]{12,14}(?:&p2=(?:[a-z0-9]([\._-])?){1,24}(?:_DROPPER)?)$/Ri"; content:"//?m="; fast_pattern; startswith; reference:url,blog.yoroi.company/research/the-north-korean-kimsuky-apt-keeps-threatening-south-korea-evolving-its-ttps/; classtype:trojan-activity; sid:2029576; rev:3; metadata:attack_target Client_Endpoint, created_at 2020_03_05, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_22;)