alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Zbot download config - SET"; flow:established,to_server; flowbits:set,ET.zbot.dat; flowbits:noalert; http.method; content:"GET"; http.uri; content:".dat"; endswith; http.header_names; content:!"Content-Type|0d 0a|"; content:!"Referer"; classtype:trojan-activity; sid:2022317; rev:3; metadata:created_at 2015_12_30, signature_severity Major, updated_at 2020_06_17;)