alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE BePush/Kilim Checkin"; flow:established,to_server; flowbits:set,ET.FB.troj; http.method; content:"GET"; http.uri; content:"/ok.txt"; endswith; http.user_agent; content:"AutoHotkey"; depth:10; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; content:!"Accept"; reference:url,seclists.org/fulldisclosure/2015/Jan/131; reference:md5,cdcc132fad2e819e7ab94e5e564e8968; classtype:command-and-control; sid:2020348; rev:5; metadata:created_at 2015_02_03, signature_severity Major, updated_at 2020_05_21;)