Rule History

alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Possible WEBC2-GREENCAT Response - Embedded CnC APT1 Related"; flow:established,from_server; file_data; content:"<!--|0d 0a|<img border="; pcre:"/^[0-4]\s*src=\x22[^\x22]+\x22\swidth=\d+\sheight=\d+>\r\n-->/R"; reference:url,www.mandiant.com/apt1; reference:md5,b5e9ce72771217680efaeecfafe3da3f; classtype:targeted-activity; sid:2016455; rev:3; metadata:created_at 2013_02_22, confidence Medium, signature_severity Major, updated_at 2019_07_26;)