alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Roficor.A (Darkhotel) Checkin 2"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/txt/read.php"; fast_pattern; pcre:"/\/txt\/read\.php$/"; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; reference:url,securelist.com/blog/research/66779/the-darkhotel-apt/; classtype:targeted-activity; sid:2019688; rev:4; metadata:created_at 2014_11_11, malware_family Win32_Roficor_A, signature_severity Major, updated_at 2020_09_28;)