alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Win32/Valak - Stage 2 - Response - Plugin"; flow:established,to_client; http.stat_code; content:"200"; http.response_body; content:"|2d 2d|PLUGIN|2d 2d|"; startswith; content:"|2d 2d|PD94bWwg"; distance:0; reference:md5,c254b4f261a6f426c282ed8858a7bee0; reference:url,medium.com/@prsecurity_/casual-analysis-of-valak-c2-3497fdb79bf7; classtype:command-and-control; sid:2029196; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_12_22, deployment Perimeter, malware_family Win32_Valak, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_12_22;)