alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Dyreza RAT Fake Server Header"; flow:established,to_client; http.protocol; content:"HTTP/1."; http.server; content:"Stalin"; fast_pattern; startswith; reference:md5,7e3e28320d209a586917668e3b8eac40; classtype:trojan-activity; sid:2018775; rev:6; metadata:created_at 2014_07_25, signature_severity Major, updated_at 2020_10_28;)