alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE BePush/Kilim Checkin response"; flow:established,to_client; flowbits:isset,ET.FB.troj; file.data; content:"Server_ok"; startswith; reference:url,seclists.org/fulldisclosure/2015/Jan/131; reference:md5,cdcc132fad2e819e7ab94e5e564e8968; classtype:command-and-control; sid:2020349; rev:5; metadata:created_at 2015_02_03, signature_severity Major, updated_at 2024_04_14;)