alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Hancitor/Tordal Document Request"; flow:established,to_server; flowbits:set,ET.Hancitor; flowbits:noalert; http.method; content:"GET"; http.uri; content:".php?d="; fast_pattern; pcre:"/\.php\?d=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/"; http.header_names; content:!"Referer|0d 0a|"; content:!"Cookie"; classtype:trojan-activity; sid:2024604; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_08_22, deployment Perimeter, malware_family Hancitor, malware_family Tordal, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_11_05;)