alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL.Zapchast Checkin"; flow:to_server,established; http.uri; content:"/files/def"; fast_pattern; endswith; http.header_names; content:!"Accept|0d 0a|"; content:!"Referer|0d 0a|"; http.user_agent; content:"AutoIt"; depth:6; reference:md5,63586aef2be494150a492d822147055a; classtype:command-and-control; sid:2018142; rev:4; metadata:created_at 2014_02_15, signature_severity Major, updated_at 2020_04_27;)