68 строки
2.5 KiB
YAML
68 строки
2.5 KiB
YAML
id: 85aca4d1-5d15-4001-abd9-acb86ca1786a
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name: (Preview) TI map Domain entity to DnsEvent
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description: |
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'Identifies a match in DnsEvent table from any Domain IOC from TI'
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severity: Medium
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requiredDataConnectors:
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- connectorId: DNS
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dataTypes:
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- DnsEvents
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- connectorId: ThreatIntelligence
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dataTypes:
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- ThreatIntelligenceIndicator
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- connectorId: ThreatIntelligenceTaxii
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dataTypes:
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- ThreatIntelligenceIndicator
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queryFrequency: 1h
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queryPeriod: 14d
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triggerOperator: gt
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triggerThreshold: 0
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tactics:
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- Impact
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query: |
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let dt_lookBack = 1h;
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let ioc_lookBack = 14d;
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//Create a list of TLDs in our threat feed for later validation
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let list_tlds = ThreatIntelligenceIndicator
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| where TimeGenerated > ago(ioc_lookBack)
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| where isnotempty(DomainName)
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| extend parts = split(DomainName, '.')
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| extend tld = parts[(array_length(parts)-1)]
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| summarize count() by tostring(tld)
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| summarize make_list(tld);
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ThreatIntelligenceIndicator
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| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
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| where Active == true
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// Picking up only IOC's that contain the entities we want
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| where isnotempty(DomainName)
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| join (
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DnsEvents
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| where TimeGenerated > ago(dt_lookBack)
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//Extract domain patterns from syslog message
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| where isnotempty(Name)
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| extend parts = split(Name, '.')
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//Split out the TLD
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| extend tld = parts[(array_length(parts)-1)]
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//Validate parsed domain by checking if the TLD is in the list of TLDs in our threat feed
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| where tld in~ (list_tlds)
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| extend DNS_TimeGenerated = TimeGenerated
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) on $left.DomainName==$right.Name
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| where DNS_TimeGenerated >= TimeGenerated and DNS_TimeGenerated < ExpirationDateTime
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| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
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| project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, DNS_TimeGenerated, Computer, ClientIP, Name, QueryType
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| extend timestamp = DNS_TimeGenerated, HostCustomEntity = Computer, IPCustomEntity = ClientIP, URLCustomEntity = Url
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entityMappings:
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- entityType: Host
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fieldMappings:
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- identifier: FullName
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columnName: HostCustomEntity
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- entityType: IP
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fieldMappings:
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- identifier: Address
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columnName: IPCustomEntity
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- entityType: URL
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fieldMappings:
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- identifier: Url
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columnName: URLCustomEntity
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version: 1.0.0 |