alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL.Zapchast Checkin"; flow:established,to_server; http.uri; bsize:10; content:"/files/def"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|accept|0d 0a|"; content:!"|0d 0a|referer|0d 0a|"; http.user_agent; content:"AutoIt"; startswith; reference:md5,63586aef2be494150a492d822147055a; classtype:command-and-control; sid:2018142; rev:8; metadata:created_at 2014_02_15, signature_severity Major, updated_at 2024_05_04;)