alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Nivdort Posting Data 2"; flow:established,to_server; content:"|0d 0a 0d 0a|env="; fast_pattern; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; pcre:"/^env=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})/"; http.content_type; content:"application/x-www-form-urlencoded"; depth:33; endswith; http.protocol; content:"HTTP/1.0"; http.header_names; content:!"User-Agent|0d 0a|"; content:!"Accept-"; content:!"Referer|0d 0a|"; reference:url,www.microsoft.com/security/portal/threat/encyclopedia/entry.aspx?Name=TrojanSpy%3AWin32/Nivdort; classtype:trojan-activity; sid:2022281; rev:4; metadata:created_at 2015_12_18, malware_family Win32_Nivdort, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_05;)