alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET CURRENT_EVENTS Possible Locky Payload DL Sept 26 2017 M3"; flow:established,to_server; urilen:>6; content:"MSIE"; http_user_agent; fast_pattern; pcre:"/^(?:\/(?:(?:af|p66)\/(?=(?:[a-zA-Z]{0,12}[0-9]|(?=[a-z0-9]{0,12}[A-Z])(?=[A-Z0-9]{0,12}[a-z])))[A-Za-z0-9]{6,13}|(?=(?:[a-zA-Z]{0,12}[0-9]|(?=[a-z0-9]{0,12}[A-Z])(?=[A-Z0-9]{0,12}[a-z])))[A-Za-z0-9]{6,13}\?*(?:(?P<var1>[^=&]+)=(?P=var1))?))$/U"; http_header_names; content:!"Referer"; content:!"Cookie"; http_start; content:"HTTP/1.1|0d 0a|Accept|3a 20|*/*|0d 0a|"; flowbits:set,ET.Locky; flowbits:noalert; classtype:trojan-activity; sid:2026461; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_10_03, deployment Perimeter, malware_family Locky, performance_impact Moderate, confidence Medium, signature_severity Major, updated_at 2019_08_15;)