alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MontysThree HTTPTransport Module Activity"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?id="; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; http.header; content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|image|22 3b 20|filename=|22|image.jpg|22|"; fast_pattern; http.header_names; content:!"Referer"; reference:md5,1f0461dba1aefdd124f8333afe7f5982; reference:url,twitter.com/Int2e_/status/1314479575523446784; classtype:trojan-activity; sid:2030994; rev:2; metadata:attack_target Client_Endpoint, created_at 2020_10_09, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_12_10;)