alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious User-Agent Containing .exe"; flow:established,to_server; http.uri; content:!"CTX_"; http.header; content:!"lnssatt.exe"; http.user_agent; content:".exe"; nocase; endswith; fast_pattern; content:!"|5C|Citrix|5C|ICA Client|5C|"; nocase; content:!"vsee.exe"; nocase; http.host; content:!"gfi.com"; content:!"pandasoftware.com"; classtype:trojan-activity; sid:2013224; rev:16; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2011_07_07, deployment Perimeter, confidence Medium, signature_severity Informational, tag User_Agent, updated_at 2020_09_14;)