alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Dalexis Downloading EXE"; flow:established,to_server; http.uri; content:".jpg"; endswith; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 7.0|3b 20|Windows NT 6.0)"; fast_pattern; http.connection; content:"Close"; bsize:5; http.header_names; content:!"Accept"; content:!"Referer"; classtype:trojan-activity; sid:2021017; rev:3; metadata:created_at 2015_04_28, signature_severity Major, updated_at 2020_05_21;)