alert http1 $HOME_NET any -> $EXTERNAL_NET [443,7080,8080,80] (msg:"ET MALWARE W32/Emotet.v4 Checkin 3"; flow:established,to_server; http.request_line; content:"POST / HTTP/1."; fast_pattern; startswith; http.content_len; byte_test:0,<=,999,0,string,dec; byte_test:0,>,99,0,string,dec; http.user_agent; content:"|20|MSIE|20|"; http.host; pcre:"/^(?:\d{1,3}\.){3}\d{1,3}/"; http.header_names; content:!"|0d 0a|Accept"; content:!"|0d 0a|Referer|0d 0a|"; content:!"|0d 0a|Content-Type|0d 0a|"; content:!"|0d 0a|Cookie|0d 0a|"; content:!"|0d 0a|TagId|0d 0a|"; content:"|0d 0a|User-Agent|0d 0a|"; startswith; http.request_body; pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/s"; classtype:command-and-control; sid:2035050; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_09_19, deployment Perimeter, deprecation_reason False_Positive, malware_family Emotet, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_04;)