alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE JS Sniffer Framework Sending to CnC"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?image_id="; fast_pattern; pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/Ri"; http.header_names; content:"Accept"; content:"Accept-"; content:!"Referer"; reference:url,www.volexity.com/blog/2018/07/19/js-sniffer-e-commerce-data-theft-made-easy/; classtype:command-and-control; sid:2025881; rev:2; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2018_07_23, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Stealer, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_25;)