Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Emotet CnC Activity (POST) M11"; flow:established,to_server; http.method; content:"POST"; http.uri; content:!"."; content:!"&"; content:!"-"; http.user_agent; content:"Mozilla/4.0|20|(compatible|3b 20|MSIE|20|7.0|3b 20|Windows|20|NT|20|6"; startswith; http.request_body; content:!".zip"; content:!".png"; content:!".jp"; content:!".exe"; content:"--|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; fast_pattern; http.content_len; byte_test:0,<,8000,0,string,dec; byte_test:0,>,500,0,string,dec; http.header_names; content:"|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|DNT|0d 0a|Connection|0d 0a|"; startswith; content:"Referer|0d 0a|"; reference:md5,f4b00ffce71b197865071073dec5068d; classtype:trojan-activity; sid:2035077; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_10_14, deployment Perimeter, malware_family Win32_Emotet, performance_impact Significant, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_19;)