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Add Strelka YARA matches as alerts

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This commit is contained in:
Wes Lambert
2020-10-06 12:19:44 +00:00
parent e2a787095c
commit 019bec992d
2 changed files with 27 additions and 2 deletions
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26
salt/elasticsearch/files/ingest/strelka.file
View File

@@ -6,7 +6,8 @@
{ "rename": { "field": "message2.scan", "target_field": "scan", "ignore_missing": true } },
{ "rename": { "field": "message2.request", "target_field": "request", "ignore_missing": true } },
{ "rename": { "field": "scan.hash", "target_field": "hash", "ignore_missing": true } },
{ "grok": { "field": "request.attributes.filename", "patterns": ["-%{WORD:log.id.fuid}-"] } },
{ "grok": { "if": "ctx.request.attributes.filename != null", "field": "request.attributes.filename", "patterns": ["-%{WORD:log.id.fuid}-"], "ignore_failure": true } },
{ "foreach":
{
"if": "ctx.scan?.exiftool?.keys !=null",
@@ -19,8 +20,29 @@
}
}
},
{ "foreach":
{
"if": "ctx.scan?.yara?.meta !=null",
"field": "scan.yara.meta",
"processor":{
"set": {
"field": "rule.{{_ingest._value.identifier}}",
"value": "{{_ingest._value.value}}"
}
}
}
},
{ "set": { "if": "ctx.scan.yara.matches != null", "field": "rule.name", "value": "{{scan.yara.matches.0}}" }},
{ "set": { "if": "ctx.scan.yara.matches != null", "field": "dataset", "value": "alert", "override": true }},
{ "rename": { "field": "scan.hash", "target_field": "", "ignore_missing": true } },
{ "set": { "if": "ctx.rule.name != null && ctx.rule.score == null", "field": "event.severity", "value": 3, "override": true } },
{ "convert" : { "if": "ctx.rule.score != null", "field" : "rule.score","type": "integer"}},
{ "set": { "if": "ctx.rule.score != null && ctx.rule.score >= 0 && ctx.rule.score <= 49", "field": "event.severity", "value": 1, "override": true } },
{ "set": { "if": "ctx.rule.score != null && ctx.rule.score >= 50 && ctx.rule.score <=69", "field": "event.severity", "value": 2, "override": true } },
{ "set": { "if": "ctx.rule != null && ctx.rule.score >= 70 && ctx.rule.score <=89", "field": "event.severity", "value": 3, "override": true } },
{ "set": { "if": "ctx.rule != null && ctx.rule.score >= 90", "field": "event.severity", "value": 4, "override": true } },
{ "set": { "field": "observer.name", "value": "{{agent.name}}" }},
{ "remove": { "field": ["host", "path", "message", "scan.exiftool.keys"], "ignore_missing": true } },
{ "remove": { "field": ["host", "path", "message", "scan.exiftool.keys", "scan.yara.meta"], "ignore_missing": true } },
{ "pipeline": { "name": "common" } }
]
}

3
salt/elasticsearch/templates/so/so-common-template.json
View File

@@ -353,6 +353,9 @@
"type":"object",
"dynamic":true,
"properties":{
"score":{
"type":"long"
},
"uuid":{
"type":"keyword"
}