alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible APT30 or Win32/Nuclear HTTP Framework"; flow:established,to_server; http.uri; pcre:"/\.(?:txt|gif|exe|bmp)$/i"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 6.0|3b 20|Win32|29|"; depth:41; http.header_names; content:!"Referer"; content:!"Accept"; content:"|0d 0a|User-Agent|0d 0a|HOST|0d 0a|"; depth:20; fast_pattern; reference:url,www2.fireeye.com/rs/fireye/images/rpt-apt30.pdf; classtype:targeted-activity; sid:2020897; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2015_04_13, deployment Perimeter, malware_family Nuclear, confidence Medium, signature_severity Critical, tag Exploit_Kit, tag Nuclear, updated_at 2020_10_20;)