alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Nivdort Posting Data 1"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"post="; depth:5; fast_pattern; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})/R"; http.content_type; content:"application/x-www-form-urlencoded"; http.protocol; content:"HTTP/1.0"; http.header_names; content:!"User-Agent"; content:!"Accept-"; content:!"Referer"; reference:url,www.microsoft.com/security/portal/threat/encyclopedia/entry.aspx?Name=TrojanSpy%3AWin32/Nivdort; classtype:trojan-activity; sid:2022280; rev:5; metadata:created_at 2015_12_18, malware_family Win32_Nivdort, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_15;)