alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE DNSpionage Commands Embedded in Webpage Inbound"; flow:established,from_server; http.stat_code; content:"200"; file.data; content:"|3c 21 2d 2d|eyJjIjogI"; fast_pattern; content:"|3c 21 2d 2d|"; pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})/R"; reference:url,blog.talosintelligence.com/2018/11/dnspionage-campaign-targets-middle-east.html; classtype:targeted-activity; sid:2026672; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_11_28, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag DNSpionage, updated_at 2020_08_27;)