alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Matanbuchus Loader CnC M1"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.content_type; content:"application/x-www-form-urlencoded"; http.request_body; content:"=eyIzQ0VrIjoi"; fast_pattern; pcre:"/(?:IiwiM2ZlMTEiOi|IsIjNmZTExIjoi|iLCIzZmUxMSI6I)/R"; reference:url,twitter.com/fr0s7_/status/1458823504925798408; classtype:command-and-control; sid:2034466; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_11_16, deployment Perimeter, malware_family Matanbuchus, confidence High, signature_severity Major, updated_at 2021_11_16, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)