GreyNoise TI Map IP Entity to DnsEvents
Id | ddf47b6f-870c-5712-a296-1383acb13c82 |
Rulename | GreyNoise TI Map IP Entity to DnsEvents |
Description | This query maps any IP indicators of compromise (IOCs) from GreyNoise Threat Intelligence (TI), by searching for matches in DnsEvents. |
Severity | Medium |
Tactics | CommandAndControl |
Techniques | T1071 |
Required data connectors | ASimDnsActivityLogs DNS GreyNoise2SentinelAPI ThreatIntelligence ThreatIntelligenceTaxii |
Kind | Scheduled |
Query frequency | 1h |
Query period | 14d |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GreyNoiseThreatIntelligence/Analytic Rules/GreyNoise_IPEntity_DnsEvents.yaml |
Version | 1.0.2 |
Arm template | ddf47b6f-870c-5712-a296-1383acb13c82.json |
let dt_lookBack = 1h; // Look back 1 hour for DNS events
let ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators
// Fetch threat intelligence indicators related to IP addresses
let IP_Indicators = ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| where SourceSystem == 'GreyNoise'
| where isnotempty(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
| extend TI_ipEntity = iff(isnotempty(NetworkIP), NetworkIP, NetworkDestinationIP)
| extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)
| extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)
| where ipv4_is_private(TI_ipEntity) == false and TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127.";
// Perform a join between IP indicators and DNS events
IP_Indicators
// Use innerunique to keep performance fast and result set low, as we only need one match to indicate potential malicious activity that needs investigation
| join kind=innerunique (
DnsEvents
| where TimeGenerated >= ago(dt_lookBack)
| where SubType =~ "LookupQuery" and isnotempty(IPAddresses)
| mv-expand SingleIP = split(IPAddresses, ", ") to typeof(string)
| extend DNS_TimeGenerated = TimeGenerated
)
on $left.TI_ipEntity == $right.SingleIP
// Filter out DNS events that occurred after the expiration of the corresponding indicator
| where DNS_TimeGenerated < ExpirationDateTime
// Group the results by IndicatorId and SingleIP, and keep the DNS event with the latest timestamp
| summarize DNS_TimeGenerated = arg_max(DNS_TimeGenerated, *) by IndicatorId, SingleIP
// Select the desired output fields
| project DNS_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, DomainName, ExpirationDateTime, ConfidenceScore,
TI_ipEntity, Computer, EventId, SubType, ClientIP, Name, IPAddresses, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type
| extend timestamp = DNS_TimeGenerated, HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))
queryFrequency: 1h
kind: Scheduled
severity: Medium
version: 1.0.2
relevantTechniques:
- T1071
name: GreyNoise TI Map IP Entity to DnsEvents
triggerThreshold: 0
query: |
let dt_lookBack = 1h; // Look back 1 hour for DNS events
let ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators
// Fetch threat intelligence indicators related to IP addresses
let IP_Indicators = ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| where SourceSystem == 'GreyNoise'
| where isnotempty(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
| extend TI_ipEntity = iff(isnotempty(NetworkIP), NetworkIP, NetworkDestinationIP)
| extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)
| extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)
| where ipv4_is_private(TI_ipEntity) == false and TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127.";
// Perform a join between IP indicators and DNS events
IP_Indicators
// Use innerunique to keep performance fast and result set low, as we only need one match to indicate potential malicious activity that needs investigation
| join kind=innerunique (
DnsEvents
| where TimeGenerated >= ago(dt_lookBack)
| where SubType =~ "LookupQuery" and isnotempty(IPAddresses)
| mv-expand SingleIP = split(IPAddresses, ", ") to typeof(string)
| extend DNS_TimeGenerated = TimeGenerated
)
on $left.TI_ipEntity == $right.SingleIP
// Filter out DNS events that occurred after the expiration of the corresponding indicator
| where DNS_TimeGenerated < ExpirationDateTime
// Group the results by IndicatorId and SingleIP, and keep the DNS event with the latest timestamp
| summarize DNS_TimeGenerated = arg_max(DNS_TimeGenerated, *) by IndicatorId, SingleIP
// Select the desired output fields
| project DNS_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, DomainName, ExpirationDateTime, ConfidenceScore,
TI_ipEntity, Computer, EventId, SubType, ClientIP, Name, IPAddresses, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type
| extend timestamp = DNS_TimeGenerated, HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GreyNoiseThreatIntelligence/Analytic Rules/GreyNoise_IPEntity_DnsEvents.yaml
requiredDataConnectors:
- connectorId: ThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: DNS
dataTypes:
- DnsEvents
- connectorId: ASimDnsActivityLogs
dataTypes:
- DnsEvents
- connectorId: GreyNoise2SentinelAPI
dataTypes:
- ThreatIntelligenceIndicator
description: |
This query maps any IP indicators of compromise (IOCs) from GreyNoise Threat Intelligence (TI), by searching for matches in DnsEvents.
tactics:
- CommandAndControl
id: ddf47b6f-870c-5712-a296-1383acb13c82
queryPeriod: 14d
entityMappings:
- fieldMappings:
- columnName: HostName
identifier: HostName
- columnName: DnsDomain
identifier: DnsDomain
entityType: Host
- fieldMappings:
- columnName: ClientIP
identifier: Address
entityType: IP
- fieldMappings:
- columnName: Url
identifier: Url
entityType: URL
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/ddf47b6f-870c-5712-a296-1383acb13c82')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ddf47b6f-870c-5712-a296-1383acb13c82')]",
"properties": {
"alertRuleTemplateName": "ddf47b6f-870c-5712-a296-1383acb13c82",
"customDetails": null,
"description": "This query maps any IP indicators of compromise (IOCs) from GreyNoise Threat Intelligence (TI), by searching for matches in DnsEvents.\n",
"displayName": "GreyNoise TI Map IP Entity to DnsEvents",
"enabled": true,
"entityMappings": [
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "HostName",
"identifier": "HostName"
},
{
"columnName": "DnsDomain",
"identifier": "DnsDomain"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "ClientIP",
"identifier": "Address"
}
]
},
{
"entityType": "URL",
"fieldMappings": [
{
"columnName": "Url",
"identifier": "Url"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GreyNoiseThreatIntelligence/Analytic Rules/GreyNoise_IPEntity_DnsEvents.yaml",
"query": "let dt_lookBack = 1h; // Look back 1 hour for DNS events\nlet ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators\n// Fetch threat intelligence indicators related to IP addresses\nlet IP_Indicators = ThreatIntelligenceIndicator\n | where TimeGenerated >= ago(ioc_lookBack)\n | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n | where Active == true and ExpirationDateTime > now()\n | where SourceSystem == 'GreyNoise'\n | where isnotempty(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)\n | extend TI_ipEntity = iff(isnotempty(NetworkIP), NetworkIP, NetworkDestinationIP)\n | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)\n | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)\n | where ipv4_is_private(TI_ipEntity) == false and TI_ipEntity !startswith \"fe80\" and TI_ipEntity !startswith \"::\" and TI_ipEntity !startswith \"127.\";\n// Perform a join between IP indicators and DNS events\nIP_Indicators\n // Use innerunique to keep performance fast and result set low, as we only need one match to indicate potential malicious activity that needs investigation\n | join kind=innerunique (\n DnsEvents\n | where TimeGenerated >= ago(dt_lookBack)\n | where SubType =~ \"LookupQuery\" and isnotempty(IPAddresses)\n | mv-expand SingleIP = split(IPAddresses, \", \") to typeof(string)\n | extend DNS_TimeGenerated = TimeGenerated\n )\n on $left.TI_ipEntity == $right.SingleIP\n // Filter out DNS events that occurred after the expiration of the corresponding indicator\n | where DNS_TimeGenerated < ExpirationDateTime\n // Group the results by IndicatorId and SingleIP, and keep the DNS event with the latest timestamp\n | summarize DNS_TimeGenerated = arg_max(DNS_TimeGenerated, *) by IndicatorId, SingleIP\n // Select the desired output fields\n | project DNS_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, DomainName, ExpirationDateTime, ConfidenceScore,\n TI_ipEntity, Computer, EventId, SubType, ClientIP, Name, IPAddresses, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type\n | extend timestamp = DNS_TimeGenerated, HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))\n",
"queryFrequency": "PT1H",
"queryPeriod": "P14D",
"severity": "Medium",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CommandAndControl"
],
"techniques": [
"T1071"
],
"templateVersion": "1.0.2",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}