alert http $EXTERNAL_NET [443,7080,8080,80] -> $HOME_NET any (msg:"ET MALWARE Emotet Post Drop C2 Comms M2"; flow:established,from_server; http.stat_code; content:"404"; http.header; content:"Content-Length|3a 20|148|0d 0a|"; fast_pattern; http.content_type; content:"text/html"; depth:9; file.data; content:!"<html"; nocase; pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/si"; reference:md5,dacdcd451204265ad6f44ef99db1f371; classtype:command-and-control; sid:2035049; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_09_19, deployment Perimeter, malware_family Emotet, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_09;)