alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Unknown Trojan Download"; flow:established,to_server; content:"/taskmgr.exe"; http_uri; fast_pattern; content:"Accept-Language|3a 20|zh-cn|0d 0a|User-Agent|3a 20|Mozilla/4.0 (compatible|3b| MSIE 6.0|3b| Windows NT 5.1|3b| SV1)|0d 0a|"; http_header; reference:md5,3a2c3b422a7ec78f88a939d20ed07615; classtype:trojan-activity; sid:2017659; rev:6; metadata:created_at 2013_11_04, signature_severity Unknown, updated_at 2019_07_26;)