alert http $HOME_NET any -> $EXTERNAL_NET [7080,8080,443,80,4143,995,21,50000,20,8090,8443,990,22] (msg:"ET MALWARE Win32/Emotet CnC Activity (POST) M5"; flow:established,to_server; http.method; content:"POST"; http.uri; content:!"."; content:!"&"; content:!"-"; http.header; content:"DNT|3a 20|1|0d 0a|"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 7.0|3b 20|Windows NT 6."; startswith; http.request_body; content:!"."; content:"%2F"; fast_pattern; http.content_len; byte_test:0,<,800,0,string,dec; byte_test:0,>,300,0,string,dec; http.start; pcre:"/^POST\s(?P<urivar>\/(?:[A-Z0-9a-z]{2,25}){1,5})\sHTTP\/1\.1\r\nReferer\x3a\x20http\x3a\x2f\x2f[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}(?:\x3a[0-9]{2,5})?(?P=urivar)\r\n/"; http.header_names; content:"|0d 0a|Referer|0d 0a|Content-Type|0d 0a|DNT|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Connection|0d 0a|Cache-Control|0d 0a 0d 0a|"; depth:93; reference:md5,e5fecd3be1747f6a934f70e921399a10; classtype:command-and-control; sid:2029059; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_11_27, deployment Perimeter, malware_family Emotet, performance_impact Significant, confidence High, signature_severity Major, updated_at 2024_04_04;)