alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Emotet Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/"; offset:1; content:"/"; distance:0; pcre:"/^\/[A-Za-z0-9]+\/[A-Za-z0-9]+\/$/"; http.header_names; content:!"Accept-"; content:!"Referer|0d 0a|"; http.user_agent; content:"MSIE 7.0|3b|"; fast_pattern; content:"Windows NT 6.0"; within:15; http.request_body; pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/"; reference:md5,3083b68cb5c2a345972a5f79e735c7b9; classtype:command-and-control; sid:2019693; rev:7; metadata:created_at 2014_11_12, performance_impact Significant, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_22;)