alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Dridex DL Pattern Feb 18 2016"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".exe?."; fast_pattern; pcre:"/\.exe\?\.\d+$/"; http.user_agent; content:"MSIE 7.0|3b 20|Windows NT"; http.header_names; content:!"Referer|0d 0a|"; classtype:trojan-activity; sid:2022549; rev:6; metadata:created_at 2016_02_19, signature_severity Major, updated_at 2020_10_13;)