alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE f0xy Checkin"; flow:established,to_server; urilen:10; http.method; content:"GET"; http.uri; content:"/hello.php"; fast_pattern; http.header_names; content:"|0d 0a|Host|0d 0a 0d 0a|"; startswith; endswith; reference:md5,160634d784c256d29563117554685c31; reference:url,community.websense.com/blogs/securitylabs/archive/2015/01/29/new-f0xy-malware-employs-cunning-stealth-amp-trickery.aspx; classtype:command-and-control; sid:2020339; rev:8; metadata:created_at 2015_01_30, signature_severity Major, updated_at 2024_04_14;)