alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Trojan-Ransom.Win32.Blocker.bjat"; flow:established,to_server; http.uri; content:"?&"; http.header_names; content:!"Accept|0d 0a|"; content:!"Referer|0d 0a|"; http.header; content:"User-Agent|3a 20|Update"; fast_pattern; classtype:trojan-activity; sid:2017281; rev:5; metadata:created_at 2013_08_06, signature_severity Unknown, updated_at 2022_03_02;)