Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WEB_SERVER WebShell - Generic - GIF Header With HTML Form"; flow:established,to_client; file_data; content:"GIF89a"; within:6; content:"<form "; nocase; fast_pattern; within:150; content:!"_VIEWSTATE"; classtype:trojan-activity; sid:2017134; rev:5; metadata:created_at 2013_07_12, confidence Medium, signature_severity Major, updated_at 2019_07_26;)