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Begin switch to ECS for Suricata

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This commit is contained in:
Wes Lambert
2020-03-02 19:07:40 +00:00
parent f40b23e4b2
commit 9eb5a9be3a
1 changed files with 109 additions and 165 deletions
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220
salt/logstash/pipelines/config/so/1033_preprocess_snort.conf
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@@ -1,124 +1,92 @@
# Author: Justin Henderson
# SANS Instructor and author of SANS SEC555: SIEM and Tactical Analytics
# Updated by: Doug Burks
# Last Update: 3/15/2018
filter { filter {
if [type] == "ids" {
# This is the initial parsing of the log
if [engine] == "suricata" { if [engine] == "suricata" {
json { json {
source => "message" source => "message"
} }
mutate { mutate {
rename => { "alert" => "orig_alert" } # Make this compatible with event.id as a string
rename => { "[orig_alert][gid]" => "gid" } convert => { "[flow_id]" => "string" }
rename => { "[orig_alert][signature_id]" => "sid" } rename => {
rename => { "[orig_alert][rev]" => "rev" } "proto" => "[network][transport]"
rename => { "[orig_alert][signature]" => "alert" } "event_type" => "[event][dataset]"
rename => { "[orig_alert][category]" => "classification" } "flow_id" => "[event][id]"
rename => { "[orig_alert][severity]" => "priority" } "community_id" => "[network][community_id]"
rename => { "[orig_alert][rule]" => "rule_signature" } }
rename => { "app_proto" => "application_protocol" } lowercase => [ "[network][transport]" ]
rename => { "dest_ip" => "destination_ip" } merge => {"[event][id]" => "[related][id]" }
rename => { "dest_port" => "destination_port" } add_field => {
rename => { "in_iface" => "interface" } "[related][domain]" => []
rename => { "proto" => "protocol" } "[related][ip]" => []
rename => { "src_ip" => "source_ip" } "[related][id]" => []
rename => { "src_port" => "source_port" } "[event][module]" => "suricata"
#rename => { "[fileinfo][filename]" => "filename" } "[event][created]" => "%{[@timestamp]}"
#rename => { "[fileinfo][gaps]" => "gaps" } "[event][version]" => "1.0.0"
#rename => { "[fileinfo][size]" => "size" } "[event][category]" => "network"
#rename => { "[fileinfo][state]" => "state" } }
#rename => { "[fileinfo][stored]" => "stored" } }
#rename => { "[fileinfo][tx_id]" => "tx_id" }
#rename => { "[flow][age]" => "duration" }
#rename => { "[flow][alerted]" => "flow_alerted" }
#rename => { "[flow][bytes_toclient]" => "bytes_to_client" }
#rename => { "[flow][bytes_toserver]" => "bytes_to_server" }
#rename => { "[flow][end]" => "flow_end" }
#rename => { "[flow][pkts_toclient]" => "packets_to_client" }
#rename => { "[flow][pkts_toserver]" => "packets_to_server" }
#rename => { "[flow][reason]" => "reason" }
#rename => { "[flow][start]" => "flow_start" }
#rename => { "[flow][state]" => "state" }
#rename => { "[netflow][age]" => "duration" }
#rename => { "[netflow][bytes]" => "bytes" }
#rename => { "[netflow][end]" => "netflow_end" }
#rename => { "[netflow][start]" => "netflow_start" }
#rename => { "[netflow][pkts]" => "packets" }
rename => { "[alert][action]" => "action" }
rename => { "[alert][category]" => "category" }
rename => { "[alert][gid]" => "gid" }
rename => { "[alert][rev]" => "rev" }
rename => { "[alert][severity]" => "severity" }
rename => { "[alert][signature]" => "signature" }
rename => { "[alert][signature_id]" => "sid" }
#rename => { "[dns][aa]" => "aa" }
#rename => { "[dns][flags]" => "flags" }
#rename => { "[dns][id]" => "id" }
#rename => { "[dns][qr]" => "qr" }
#rename => { "[dns][rcode]" => "rcode_name" }
#rename => { "[dns][rrname]" => "rrname" }
#rename => { "[dns][rrtype]" => "rrtype" }
#rename => { "[dns][tx_id]" => "tx_id" }
#rename => { "[dns][type]" => "record_type" }
#rename => { "[dns][version]" => "version" }
rename => { "[http][hostname]" => "virtual_host" }
rename => { "[http][http_content_type]" => "content_type" }
rename => { "[http][http_port]" => "http_port" }
rename => { "[http][http_method]" => "method" }
rename => { "[http][http_user_agent]" => "useragent" }
#rename => { "[http][length]" => "payload_length" }
#rename => { "[http][protocol]" => "http_version" }
rename => { "[http][status]" => "status_message" }
rename => { "[http][url]" => "url" }
#rename => { "[metadata][flowbits]" => "flowbits" }
rename => { "[tls][fingerprint]" => "certificate_serial_number" }
rename => { "[tls][issuerdn]" => "issuer_distinguished_name" }
rename => { "[tls][notafter]" => "certificate_not_valid_after" }
rename => { "[tls][notbefore]" => "certificate_not_valid_before" }
rename => { "[tls][subject]" => "certificate_common_name" }
rename => { "[tls][version]" => "tls_version" }
rename => { "event_type" => "ids_event_type" }
remove_field => [ "offset", "orig_alert", "beat", "input", "prospector" ]
remove_tag => [ "beats_input_codec_plain_applied" ]
add_tag => [ "eve" ]
} # Set the timestamp from the event
} else {
grok {
match => ["message", "\[%{INT:gid}:%{INT:sid}:%{INT:rev}\]\s%{DATA:alert}\[Classification:\s+%{DATA:classification}\]\s+\[Priority:\s+%{INT:priority}\]:\s+<%{DATA:interface}>\s+{%{DATA:protocol}}\s+(?:%{IPV4:source_ip}|%{IPV6:source_ip}):%{INT:source_port}\s+->\s+(?:%{IPV4:destination_ip}|%{IPV6:destination_ip}):%{INT:destination_port}",
"message", "\[%{INT:gid}:%{INT:sid}:%{INT:rev}\]\s%{DATA:alert}\[Classification:\s+%{DATA:classification}\]\s+\[Priority:\s+%{INT:priority}\]:\s+<%{DATA:interface}>\s+{%{DATA:protocol}}\s(?:%{IPV4:source_ip}|%{IPV6:source_ip})\s+->\s+(?:%{IPV4:destination_ip}|%{IPV6:destination_ip})",
"message", "\[%{INT:gid}:%{INT:sid}:%{INT:rev}\]\s%{DATA:alert}\[Classification:\s+%{DATA:classification}\]\s+\[Priority:\s+%{INT:priority}\]:\s+{%{DATA:protocol}}\s+(?:%{IPV4:source_ip}|%{IPV6:source_ip}):%{INT:source_port}\s+->\s+%{IPV4:destination_ip}:%{INT:destination_port}",
"message", "\[%{INT:gid}:%{INT:sid}:%{INT:rev}\]\s%{DATA:alert}\[Classification:\s+%{DATA:classification}\]\s+\[Priority:\s+%{INT:priority}\]:\s+{%{DATA:protocol}}\s(?:%{IPV4:source_ip}|%{IPV6:source_ip})\s+->\s+(?:%{IPV4:destination_ip}|%{IPV6:destination_ip})",
"message", "\[%{INT:gid}:%{INT:sid}:%{INT:rev}\]\s%{DATA:alert}\[Classification:\s+%{DATA:classification}\]\s+\[Priority:\s+%{INT:priority}\]:\s+{%{DATA:protocol}}\s+(?:%{IPV4:source_ip}|%{IPV6:source_ip}):%{INT:source_port}\s+->\s+(?:%{IPV4:destination_ip}|%{IPV6:destination_ip}):%{INT:destination_port}",
"message", "\[%{INT:gid}:%{INT:sid}:%{INT:rev}\]\s%{DATA:alert}\[Classification:\s+%{DATA:classification}\]\s+\[Priority:\s+%{INT:priority}\]:\s+{%{DATA:protocol}}\s(?:%{IPV4:source_ip}|%{IPV6:source_ip})\s+->\s+(?:%{IPV4:source_ip}|%{IPV6:source_ip})",
"message", "\[%{INT:gid}:%{INT:sid}:%{INT:rev}\]\s%{DATA:alert}\[Classification:\s+%{DATA:classification}\]\s+\[Priority:\s+%{INT:priority}\]:\s+{%{DATA:protocol}}",
"message", "\A%{TIME} pid\(%{INT}\) Alert Received: %{INT} %{INT:priority} %{DATA:classification} %{DATA:interface} \{%{DATA:timestamp}} %{INT} %{INT} \{%{DATA:alert}} %{IP:source_ip} %{IP:destination_ip} %{INT:protocol} %{INT:source_port} %{INT:destination_port} %{INT:gid} %{INT:sid} %{INT:rev} %{INT} %{INT}\Z",
"message", "%{GREEDYDATA:alert}"]
}
}
if [timestamp] {
mutate {
add_field => { "logstash_timestamp" => "%{@timestamp}" }
}
mutate {
convert => { "logstash_timestamp" => "string" }
}
date { date {
match => [ "timestamp", "ISO8601" ] match => [ "timestamp", "ISO8601" ]
tag_on_failure => [ "_dateparsefailure", "_parsefailure", "_suricata_dateparsefailure" ]
remove_field => [ "timestamp" ]
} }
# Suricata uses top-level src/dest to track flow
if [src_ip] {
mutate { mutate {
rename => { "logstash_timestamp" => "timestamp" } rename => {
"[src_ip]" => "[source][ip]"
"[src_port]" => "[source][port]"
}
merge => { "[related][ip]" => "[source][ip]" }
}
}
if [dest_ip] {
mutate {
rename => {
"[dest_ip]" => "[destination][ip]"
"[dest_port]" => "[destination][port]"
}
merge => { "[related][ip]" => "[destination][ip]" }
} }
} }
if [vlan] {
mutate {
rename => { "[vlan]" => "[vlan][id]" }
}
}
if [app_proto] {
if [app_proto] == "failed" {
# delete failed detections to be consistent with zeek
mutate { rename => { "app_proto" => "[error][message]" } }
}
else {
mutate { rename => {"app_proto" => "[network][protocol]"}}
}
}
if [event_type] == "alert" {
if [alert][severity] == 1 {
mutate {
add_field => { "severity" => "High" }
}
}
if [alert][severity] == 2 {
mutate {
add_field => { "severity" => "Medium" }
}
}
if [alert][severity] == 3 {
mutate {
add_field => { "severity" => "Low" }
}
}
# If the alert is a Snort GPL alert break it apart for easier reading and categorization # If the alert is a Snort GPL alert break it apart for easier reading and categorization
if [alert] =~ "GPL " { if [alert][signature] =~ "GPL " {
# This will parse out the category type from the alert # This will parse out the category type from the alert
grok { grok {
match => { "alert" => "GPL\s+%{DATA:category}\s" } match => { "[alert][signature]" => "GPL\s+%{DATA:category}\s" }
} }
# This will store the category # This will store the category
mutate { mutate {
@@ -127,55 +95,31 @@ filter {
} }
} }
# If the alert is an Emerging Threat alert break it apart for easier reading and categorization # If the alert is an Emerging Threat alert break it apart for easier reading and categorization
if [alert] =~ "ET " { if [alert][signature] =~ "ET " {
# This will parse out the category type from the alert # This will parse out the category type from the alert
grok { grok {
match => { "alert" => "ET\s+%{DATA:category}\s" } match => { "[alert][signature]" => "ET\s+%{DATA:category}\s" }
} }
# This will store the category # This will store the category
mutate { mutate {
add_field => { "rule_type" => "Emerging Threats" } add_field => { "rule_type" => "Emerging Threats" }
lowercase => [ "category" ] lowercase => [ "category" ]
} }
}
# I recommend changing the field types below to integer so searches can do greater than or less than
# and also so math functions can be ran against them
mutate {
convert => [ "source_port", "integer" ]
convert => [ "destination_port", "integer" ]
convert => [ "gid", "integer" ]
convert => [ "sid", "integer" ]
# remove_field => [ "message"]
}
# This will translate the priority field into a severity field of either High, Medium, or Low
if [priority] == 1 {
mutate {
add_field => { "severity" => "High" }
}
}
if [priority] == 2 {
mutate {
add_field => { "severity" => "Medium" }
}
}
if [priority] == 3 {
mutate {
add_field => { "severity" => "Low" }
}
} }
# This section adds URLs to lookup information about a rule online # This section adds URLs to lookup information about a rule online
if [sid] and [sid] > 0 and [sid] < 1000000 { if [rule_type] == "Snort GPL" {
mutate { mutate {
add_field => [ "signature_info", "https://www.snort.org/search?query=%{gid}-%{sid}" ] add_field => [ "signature_info", "https://www.snort.org/search?query=%{[alert][gid]}-%{[alert][signature_id]}" ]
} }
} }
if [sid] and [sid] > 1999999 and [sid] < 2999999 { if [rule_type] == "Emerging Threats" {
mutate { mutate {
add_field => [ "signature_info", "http://doc.emergingthreats.net/%{sid}" ] add_field => [ "signature_info", "http://doc.emergingthreats.net/%{[alert][signature_id]}" ]
} }
} }
# mutate { }
#add_tag => [ "conf_file_1033"] mutate {
# } remove_field => [ "alert" ]
}
} }
} }