alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE APT LuckyMouse Polpo Malware CnC"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".cgi/?SSID="; fast_pattern; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; http.header_names; content:!"User-Agent"; content:!"Referer"; reference:url,decoded.avast.io/luigicamastra/apt-group-targeting-governmental-agencies-in-east-asia/; classtype:command-and-control; sid:2031314; rev:2; metadata:attack_target Client_Endpoint, created_at 2020_12_09, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_12_10;)