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https://issues.apache.org/jira/browse/METRON-686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15861664#comment-15861664
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ASF GitHub Bot commented on METRON-686:
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Github user cestella commented on the issue:
https://github.com/apache/incubator-metron/pull/438
I think the only thing that's concerning me here is that we have avoided
complex types in values in the past. I believe it had to do with ES
performance and the fact that not all indexes (i.e. Solr) support it.
I'd suggest flattening that `threat.triage.level` map into
* `threat.triage.level.score`
* `threat.triage.level.name`
* `threat.triage.level.comment`
* `threat.triage.level.reason`
Or, alternatively, just drop the level and make it `threat.triage.score`,
etc.
> Record Rule Set that Fired During Threat Triage
> -----------------------------------------------
>
> Key: METRON-686
> URL: https://issues.apache.org/jira/browse/METRON-686
> Project: Metron
> Issue Type: Improvement
> Reporter: Nick Allen
> Assignee: Nick Allen
>
> h3. Problem
> There is little transparency into the Threat Triage process itself. When
> Threat Triage runs, all I get is a score. I don't know how that score was
> arrived at, which rules were triggered, and the specific values that caused a
> rule to trigger.
> More specifically, there is no way to generate a message that looks like "The
> host 'powned.svr.bank.com' has '230' inbound flows, exceeding the threshold
> of '202'". This makes it difficult for an analyst to action the alert.
> h3. Proposed Solution
> To improve the transparency of the Threat Triage process, I am proposing
> these enhancements.
> (1) Threat Triage should attach to each message all of the rules that fired
> in addition to the total calculated threat triage score.
> (2) Threat Triage should allow a custom message to be generated for each
> rule. The custom message would allow for some form of string interpolation
> so that I can add specific values from each message to the generated alert.
> We could allow this in one or both of the new fields that Casey just added,
> name and comment.
> (3) The specific method of string interpolation will be implemented under a
> separate issue.
> h3. Example
> (1) In this example, we have a telemetry message with a field called 'value'
> that we need to monitor. In Enrichment, I calculate some sort of value
> threshold, over which an alert should be generated.
> (2) In Threat Triage, I use the calculated value threshold to alert on any
> message that has a value exceeding this threshold.
> (3) By leveraging a new field called 'reason', I can embed values from the
> message, like the hostname, value, and value threshold, into the alert
> produced by Threat Triage.
> {code}
> "triageConfig" : {
> "riskLevelRules" : [ {
> "name" : "Abnormal DNS Port",
> "rule" : "source.type == 'bro' and protocol == 'dns' and ip_dst_port
> != 53",
> "score" : 10.0,
> "reason" : "FORMAT('Abnormal DNS Port: expected: 53, found: %s:%d',
> ip_dst_addr, ip_dst_port)"
> } ],
> "aggregator" : "MAX",
> "aggregationConfig" : { }
> }
> {code}
> (4) The Threat Triage process today would add only the total calculated score.
> {code}
> "threat.triage.level": 10.0
> {code}
> With this proposal, Threat Triage would add the following to the message.
> {code}
> "threat.triage.level":{
> "score":10.0,
> "rules":[
> {
> "name":"Abnormal DNS Port",
> "comment":null
> "score":10.0,
> "reason":"Abnormal DNS Port: expected: 53, found: 224.0.0.251:5353",
> }
> ]
> }
> {code}
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