GreyNoise TI map IP entity to Network Session Events ASIM Network Session schema
Id | 536e8e5c-ce0e-575e-bcc9-aba8e7bf9316 |
Rulename | GreyNoise TI map IP entity to Network Session Events (ASIM Network Session schema) |
Description | This rule identifies a match Network Sessions for which the source or destination IP address is a known GreyNoise IoC. This analytic rule uses ASIM and supports any built-in or custom source that supports the ASIM NetworkSession schema |
Severity | Medium |
Tactics | CommandAndControl |
Techniques | T1071 |
Required data connectors | AIVectraStream AWSS3 AzureFirewall AzureMonitor(VMInsights) AzureNSG CheckPoint CiscoASA CiscoAsaAma CiscoMeraki Corelight Fortinet GreyNoise2SentinelAPI MicrosoftDefenderThreatIntelligence MicrosoftSysmonForLinux MicrosoftThreatProtection PaloAltoNetworks SecurityEvents WindowsForwardedEvents WindowsSecurityEvents Zscaler |
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_imNetworkSession.yaml |
Version | 1.0.3 |
Arm template | 536e8e5c-ce0e-575e-bcc9-aba8e7bf9316.json |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let IP_TI = materialize (
ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| where SourceSystem == 'GreyNoise'
| extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP,EmailSourceIpAddress,"NO_IP")
| where TI_ipEntity != "NO_IP"
);
IP_TI
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique
(
_Im_NetworkSession (starttime=ago(dt_lookBack))
| where isnotempty(SrcIpAddr)
| summarize imNWS_mintime=min(TimeGenerated), imNWS_maxtime=max(TimeGenerated) by SrcIpAddr, DstIpAddr, Dvc, EventProduct, EventVendor
| lookup (IP_TI | project TI_ipEntity, Active) on $left.SrcIpAddr == $right.TI_ipEntity
| project-rename SrcMatch = Active
| lookup (IP_TI | project TI_ipEntity, Active) on $left.DstIpAddr == $right.TI_ipEntity
| project-rename DstMatch = Active
| where SrcMatch or DstMatch
| extend
IoCIP = iff(SrcMatch, SrcIpAddr, DstIpAddr),
IoCDirection = iff(SrcMatch, "Source", "Destination")
)on $left.TI_ipEntity == $right.IoCIP
| where imNWS_mintime < ExpirationDateTime
| project imNWS_mintime, imNWS_maxtime, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, SrcIpAddr, DstIpAddr, IoCDirection, IoCIP, Dvc, EventVendor, EventProduct
customDetails:
IoCIPDirection: IoCDirection
EventStartTime: imNWS_mintime
IoCDescription: Description
IoCConfidenceScore: ConfidenceScore
EventEndTime: imNWS_maxtime
IndicatorId: IndicatorId
ThreatType: ThreatType
ActivityGroupNames: ActivityGroupNames
IoCExpirationTime: ExpirationDateTime
id: 536e8e5c-ce0e-575e-bcc9-aba8e7bf9316
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GreyNoiseThreatIntelligence/Analytic Rules/GreyNoise_IPEntity_imNetworkSession.yaml
requiredDataConnectors:
- dataTypes:
- AWSVPCFlow
connectorId: AWSS3
- dataTypes:
- DeviceNetworkEvents
connectorId: MicrosoftThreatProtection
- dataTypes:
- SecurityEvent
connectorId: SecurityEvents
- dataTypes:
- SecurityEvent
connectorId: WindowsSecurityEvents
- dataTypes:
- WindowsEvent
connectorId: WindowsForwardedEvents
- dataTypes:
- CommonSecurityLog
connectorId: Zscaler
- dataTypes:
- Syslog
connectorId: MicrosoftSysmonForLinux
- dataTypes:
- CommonSecurityLog
connectorId: PaloAltoNetworks
- dataTypes:
- VMConnection
connectorId: AzureMonitor(VMInsights)
- dataTypes:
- AzureDiagnostics
connectorId: AzureFirewall
- dataTypes:
- AzureDiagnostics
connectorId: AzureNSG
- dataTypes:
- CommonSecurityLog
connectorId: CiscoASA
- dataTypes:
- CommonSecurityLog
connectorId: CiscoAsaAma
- dataTypes:
- Corelight_CL
connectorId: Corelight
- dataTypes:
- VectraStream
connectorId: AIVectraStream
- dataTypes:
- CommonSecurityLog
connectorId: CheckPoint
- dataTypes:
- CommonSecurityLog
connectorId: Fortinet
- dataTypes:
- ThreatIntelligenceIndicator
connectorId: MicrosoftDefenderThreatIntelligence
- dataTypes:
- Syslog
- CiscoMerakiNativePoller
connectorId: CiscoMeraki
- dataTypes:
- ThreatIntelligenceIndicator
connectorId: GreyNoise2SentinelAPI
description: |
'This rule identifies a match Network Sessions for which the source or destination IP address is a known GreyNoise IoC.
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM NetworkSession schema'
severity: Medium
queryPeriod: 14d
kind: Scheduled
tags:
- SchemaVersion: 0.2.4
Schema: ASIMNetworkSession
tactics:
- CommandAndControl
queryFrequency: 1h
query: |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let IP_TI = materialize (
ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| where SourceSystem == 'GreyNoise'
| extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP,EmailSourceIpAddress,"NO_IP")
| where TI_ipEntity != "NO_IP"
);
IP_TI
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique
(
_Im_NetworkSession (starttime=ago(dt_lookBack))
| where isnotempty(SrcIpAddr)
| summarize imNWS_mintime=min(TimeGenerated), imNWS_maxtime=max(TimeGenerated) by SrcIpAddr, DstIpAddr, Dvc, EventProduct, EventVendor
| lookup (IP_TI | project TI_ipEntity, Active) on $left.SrcIpAddr == $right.TI_ipEntity
| project-rename SrcMatch = Active
| lookup (IP_TI | project TI_ipEntity, Active) on $left.DstIpAddr == $right.TI_ipEntity
| project-rename DstMatch = Active
| where SrcMatch or DstMatch
| extend
IoCIP = iff(SrcMatch, SrcIpAddr, DstIpAddr),
IoCDirection = iff(SrcMatch, "Source", "Destination")
)on $left.TI_ipEntity == $right.IoCIP
| where imNWS_mintime < ExpirationDateTime
| project imNWS_mintime, imNWS_maxtime, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, SrcIpAddr, DstIpAddr, IoCDirection, IoCIP, Dvc, EventVendor, EventProduct
alertDetailsOverride:
alertDisplayNameFormat: A network session {{IoCDirection}} address {{IoCIP}} matched an IoC.
alertDescriptionFormat: The {{IoCDirection}} address {{IoCIP}} of a network session matched a known indicator of compromise of {{ThreatType}}. Consult the threat intelligence blead for more information on the indicator.
version: 1.0.3
triggerThreshold: 0
entityMappings:
- entityType: IP
fieldMappings:
- columnName: IoCIP
identifier: Address
status: Available
name: GreyNoise TI map IP entity to Network Session Events (ASIM Network Session schema)
relevantTechniques:
- T1071
{
"$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/536e8e5c-ce0e-575e-bcc9-aba8e7bf9316')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/536e8e5c-ce0e-575e-bcc9-aba8e7bf9316')]",
"properties": {
"alertDetailsOverride": {
"alertDescriptionFormat": "The {{IoCDirection}} address {{IoCIP}} of a network session matched a known indicator of compromise of {{ThreatType}}. Consult the threat intelligence blead for more information on the indicator.",
"alertDisplayNameFormat": "A network session {{IoCDirection}} address {{IoCIP}} matched an IoC."
},
"alertRuleTemplateName": "536e8e5c-ce0e-575e-bcc9-aba8e7bf9316",
"customDetails": {
"ActivityGroupNames": "ActivityGroupNames",
"EventEndTime": "imNWS_maxtime",
"EventStartTime": "imNWS_mintime",
"IndicatorId": "IndicatorId",
"IoCConfidenceScore": "ConfidenceScore",
"IoCDescription": "Description",
"IoCExpirationTime": "ExpirationDateTime",
"IoCIPDirection": "IoCDirection",
"ThreatType": "ThreatType"
},
"description": "'This rule identifies a match Network Sessions for which the source or destination IP address is a known GreyNoise IoC.\nThis analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM NetworkSession schema'\n",
"displayName": "GreyNoise TI map IP entity to Network Session Events (ASIM Network Session schema)",
"enabled": true,
"entityMappings": [
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IoCIP",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GreyNoiseThreatIntelligence/Analytic Rules/GreyNoise_IPEntity_imNetworkSession.yaml",
"query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet IP_TI = materialize (\nThreatIntelligenceIndicator\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 | extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP,EmailSourceIpAddress,\"NO_IP\")\n | where TI_ipEntity != \"NO_IP\"\n);\nIP_TI\n // using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated\n| join kind=innerunique \n(\n _Im_NetworkSession (starttime=ago(dt_lookBack))\n | where isnotempty(SrcIpAddr)\n | summarize imNWS_mintime=min(TimeGenerated), imNWS_maxtime=max(TimeGenerated) by SrcIpAddr, DstIpAddr, Dvc, EventProduct, EventVendor \n | lookup (IP_TI | project TI_ipEntity, Active) on $left.SrcIpAddr == $right.TI_ipEntity\n | project-rename SrcMatch = Active\n | lookup (IP_TI | project TI_ipEntity, Active) on $left.DstIpAddr == $right.TI_ipEntity\n | project-rename DstMatch = Active\n | where SrcMatch or DstMatch\n | extend \n IoCIP = iff(SrcMatch, SrcIpAddr, DstIpAddr),\n IoCDirection = iff(SrcMatch, \"Source\", \"Destination\")\n)on $left.TI_ipEntity == $right.IoCIP\n| where imNWS_mintime < ExpirationDateTime\n| project imNWS_mintime, imNWS_maxtime, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, SrcIpAddr, DstIpAddr, IoCDirection, IoCIP, Dvc, EventVendor, EventProduct\n",
"queryFrequency": "PT1H",
"queryPeriod": "P14D",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CommandAndControl"
],
"tags": [
{
"Schema": "ASIMNetworkSession",
"SchemaVersion": "0.2.4"
}
],
"techniques": [
"T1071"
],
"templateVersion": "1.0.3",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}