alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Matanbuchus Loader CnC M4"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; http.request_body; content:"=eyIzbTd4Ijoi"; fast_pattern; pcre:"/(?:IiwiYXU1byI6I|IsImF1NW8iOi|iLCJhdTVvIjoi)/R"; threshold:type limit, track by_src, count 1, seconds 120; reference:url,twitter.com/fr0s7_/status/1458823504925798408; classtype:trojan-activity; sid:2034469; rev:1; metadata:created_at 2021_11_16, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_11_16;)