alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User Agent (Microsoft Internet Explorer)"; flow:established,to_server; threshold:type limit, track by_src, count 2, seconds 360; http.user_agent; content:"Microsoft Internet Explorer"; depth:28; http.host; content:!"bbc.co.uk"; content:!"vmware.com"; content:!"rc.itsupport247.net"; content:!"msn.com"; content:!"msn.es"; content:!"live.com"; content:!"gocyberlink.com"; content:!"ultraedit.com"; content:!"windowsupdate.com"; content:!"cyberlink.com"; content:!"lenovo.com"; content:!"itsupport247.net"; content:!"msn.co.uk"; content:!"support.weixin.qq.com"; classtype:trojan-activity; sid:2002400; rev:37; metadata:created_at 2010_07_30, confidence High, signature_severity Major, updated_at 2020_08_31;)