Rule History

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) M3"; flow:established,to_server; http.method; content:"POST"; http.uri; content:!"."; content:!"&"; content:!"-"; content:"/"; endswith; 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 6.1|3b 20|"; depth:51; pcre:"/^(?:WOW64\x3b\s)?Trident\/[457]\.0\x3b\s*SLCC2\x3b\s\.NET\sCLR\s2\.0\.50727\x3b\s\.NET\sCLR\s3\.5\.30729\x3b\s(?:\x20\.NET\x20CLR\x203\.5\.30729\x3b\s)?\.NET\sCLR\s3\.0\.30729\x3b\sMedia\sCenter\sPC\s6\.0\x3b\s\.NET4\.0C\x3b\s\.NET4\.0E(?:\.NET4\.0E(?:\x3b\s)?)?(?:\x3b\sInfoPath\.3)?\)$/Rs"; http.request_body; content:!".zip"; content:!".png"; content:!".jp"; content:!".exe"; content:"%2B"; fast_pattern; http.content_len; byte_test:0,<,675,0,string,dec; byte_test:0,>,415,0,string,dec; http.start; pcre:"/^POST\s(?P<urivar>\/(?:[a-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}(?P=urivar)\r\n/"; content:"/|20|HTTP/1.1|0d 0a|Referer|3a 20|"; 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,bda5b754bb079eec4389a9f43d16c903; classtype:command-and-control; sid:2035058; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_03_27, deployment Perimeter, malware_family Emotet, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_09_17;)