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50 lines
4.9 KiB
Plaintext
50 lines
4.9 KiB
Plaintext
# Author: Justin Henderson
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# SANS Instructor and author of SANS SEC555: SIEM and Tactical Analytics
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# Email: justin@hasecuritysolution.com
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# Last Update: 12/9/2016
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filter {
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if [type] == "dns" and "bro" not in [tags] {
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json {
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source => "message"
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}
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# strip whitespace from message field
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mutate {
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strip => "message"
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}
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# If the message is blank, drop the log
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if [Message] =~ /^$/ {
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drop { }
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} else {
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if [type] == "dns" {
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# This section is lookup for a match against the log and parsing out the fields
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grok {
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match => { "Message" => "(?<timestamp>%{DATE_US} %{TIME} (?:AM|PM))\s+%{DATA:thread_id}\s+%{WORD:dns_type}\s+ %{BASE16NUM:packet_id}\s+%{WORD:dns_protocol}\s+%{WORD:dns_direction}\s+%{IP:dns_ip}\s+ %{BASE16NUM:xid}\s+%{DATA:response}\s+%{WORD:dns_query_type}\s+\[%{BASE16NUM:hex_flags}\s+%{WORD:flags}\s+ %{WORD:rcode_name}\]\s+%{WORD:query_type_name}\s+%{GREEDYDATA:dns_domain}"}
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match => { "Message" => "(?<timestamp>%{DATE_US} %{TIME} (?:AM|PM))\s+%{DATA:thread_id}\s+%{WORD:dns_type}\s+ %{BASE16NUM:packet_id}\s+%{WORD:dns_protocol}\s+%{WORD:dns_direction}\s+%{IP:dns_ip}\s+ %{BASE16NUM:xid}\s+%{DATA:response}\s+%{WORD:dns_query_type}\s+\[%{BASE16NUM:hex_flags}\s+%{WORD:flags}\s+%{WORD:recursion}\s+%{WORD:rcode_name}\]\s+%{WORD:query_type_name}\s+%{GREEDYDATA:dns_domain}"}
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match => { "Message" => "(?<timestamp>%{DATE_US} %{TIME} (?:AM|PM))\s+%{DATA:thread_id}\s+%{WORD:dns_type}\s+ %{BASE16NUM:packet_id}\s+%{WORD:dns_protocol}\s+%{WORD:dns_direction}\s+%{IP:dns_ip}\s+ %{BASE16NUM:xid}\s+%{DATA:response}\s+%{WORD:dns_query_type}\s+\[%{BASE16NUM:hex_flags}\s+%{WORD:recursion}\s+%{WORD:rcode_name}\]\s+%{WORD:query_type_name}\s+%{GREEDYDATA:dns_domain}"}
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match => { "Message" => "(?<timestamp>%{DATE_US} %{TIME} (?:AM|PM))\s+%{DATA:thread_id}\s+%{WORD:dns_type}\s+ %{BASE16NUM:packet_id}\s+%{WORD:dns_protocol}\s+%{WORD:dns_direction}\s+%{IP:dns_ip}\s+ %{BASE16NUM:xid}\s+%{DATA:response}\s+%{WORD:dns_query_type}\s+\[%{BASE16NUM:hex_flags}\s+%{WORD:rcode_name}\]\s+%{WORD:query_type_name}\s+%{GREEDYDATA:dns_domain}"}
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match => { "Message" => "(?<timestamp>%{DATE_US} %{TIME} (?:AM|PM))\s+%{DATA:thread_id}\s+%{WORD:dns_type}\s+ %{BASE16NUM:packet_id}\s+%{WORD:dns_protocol}\s+%{WORD:dns_direction}\s+%{IP:dns_ip}\s+ %{BASE16NUM:xid}\s+%{WORD:dns_query_type}\s+\[%{BASE16NUM:hex_flags}\s+%{WORD:flags}\s+ %{WORD:rcode_name}\]\s+%{WORD:query_type_name}\s+%{GREEDYDATA:dns_domain}"}
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# Server 2003 DNS logs do not include slashes or AM/PM in timestamp
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match => { "Message" => "(?<timestamp>%{YEAR}%{MONTHNUM}%{MONTHDAY} %{TIME})\s+%{DATA:thread_id}\s+%{WORD:dns_type}\s+ %{BASE16NUM:packet_id}\s+%{WORD:dns_protocol}\s+%{WORD:dns_direction}\s+%{IP:dns_ip}\s+ %{BASE16NUM:xid}\s+%{DATA:response}\s+%{WORD:dns_query_type}\s+\[%{BASE16NUM:hex_flags}\s+%{WORD:flags}\s+ %{WORD:rcode_name}\]\s+%{WORD:query_type_name}\s+%{GREEDYDATA:dns_domain}"}
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match => { "Message" => "(?<timestamp>%{YEAR}%{MONTHNUM}%{MONTHDAY} %{TIME})\s+%{DATA:thread_id}\s+%{WORD:dns_type}\s+ %{BASE16NUM:packet_id}\s+%{WORD:dns_protocol}\s+%{WORD:dns_direction}\s+%{IP:dns_ip}\s+ %{BASE16NUM:xid}\s+%{DATA:response}\s+%{WORD:dns_query_type}\s+\[%{BASE16NUM:hex_flags}\s+%{WORD:flags}\s+%{WORD:recursion}\s+%{WORD:rcode_name}\]\s+%{WORD:query_type_name}\s+%{GREEDYDATA:dns_domain}"}
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match => { "Message" => "(?<timestamp>%{YEAR}%{MONTHNUM}%{MONTHDAY} %{TIME})\s+%{DATA:thread_id}\s+%{WORD:dns_type}\s+ %{BASE16NUM:packet_id}\s+%{WORD:dns_protocol}\s+%{WORD:dns_direction}\s+%{IP:dns_ip}\s+ %{BASE16NUM:xid}\s+%{DATA:response}\s+%{WORD:dns_query_type}\s+\[%{BASE16NUM:hex_flags}\s+%{WORD:recursion}\s+%{WORD:rcode_name}\]\s+%{WORD:query_type_name}\s+%{GREEDYDATA:dns_domain}"}
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match => { "Message" => "(?<timestamp>%{YEAR}%{MONTHNUM}%{MONTHDAY} %{TIME})\s+%{DATA:thread_id}\s+%{WORD:dns_type}\s+ %{BASE16NUM:packet_id}\s+%{WORD:dns_protocol}\s+%{WORD:dns_direction}\s+%{IP:dns_ip}\s+ %{BASE16NUM:xid}\s+%{DATA:response}\s+%{WORD:dns_query_type}\s+\[%{BASE16NUM:hex_flags}\s+%{WORD:rcode_name}\]\s+%{WORD:query_type_name}\s+%{GREEDYDATA:dns_domain}"}
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match => { "Message" => "(?<timestamp>%{YEAR}%{MONTHNUM}%{MONTHDAY} %{TIME})\s+%{DATA:thread_id}\s+%{WORD:dns_type}\s+ %{BASE16NUM:packet_id}\s+%{WORD:dns_protocol}\s+%{WORD:dns_direction}\s+%{IP:dns_ip}\s+ %{BASE16NUM:xid}\s+%{WORD:dns_query_type}\s+\[%{BASE16NUM:hex_flags}\s+%{WORD:flags}\s+ %{WORD:rcode_name}\]\s+%{WORD:query_type_name}\s+%{GREEDYDATA:dns_domain}"}
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remove_field => [ "Message" ]
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}
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# This section attempts to convert the dns_domain into the traditional domain.com format
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mutate {
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gsub => [ "dns_domain", "(\(\d+\))", "." ]
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}
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grok {
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match => { "dns_domain" => "\.%{DATA:query}\.$" }
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remove_field => [ "dns_domain" ]
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}
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}
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}
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mutate {
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#add_tag => [ "conf_file_6301"]
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}
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}
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}
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