alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Unknown Keylogger checkin"; flow:established,to_server; http.method; content:"GET"; nocase; http.uri; content:"?mail="; content:"subject=Keylogger"; fast_pattern; content:"&body="; http.user_agent; content:"Mozilla/4.0 (compatible|3b| MSIE 6.0|3b| Windows NT 5.1|3b| SV1)"; startswith; classtype:command-and-control; sid:2008368; rev:8; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_19;)