alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE FTCode Stealer CnC Activity"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"l=dj0"; depth:5; fast_pattern; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})/Rs"; http.header_names; content:!"Referer"; content:!"User-Agent"; reference:url,www.malware-traffic-analysis.net/2020/04/02/index.html; classtype:command-and-control; sid:2029803; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_03, deployment Perimeter, confidence High, signature_severity Major, updated_at 2020_11_19;)