TI map IP entity to Web Session Events ASIM Web Session schema
Id | e2559891-383c-4caf-ae67-55a008b9f89e |
Rulename | TI map IP entity to Web Session Events (ASIM Web Session schema) |
Description | This rule identifies Web Sessions for which the source IP address is a known IoC. This rule uses the Advanced Security Information Model (ASIM) and supports any web session source that complies with ASIM. |
Severity | Medium |
Tactics | CommandAndControl |
Techniques | T1071 |
Required data connectors | MicrosoftDefenderThreatIntelligence SquidProxy ThreatIntelligence ThreatIntelligenceTaxii 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/Threat Intelligence/Analytic Rules/IPEntity_imWebSession.yaml |
Version | 1.2.5 |
Arm template | e2559891-383c-4caf-ae67-55a008b9f89e.json |
let HAS_ANY_MAX = 10000;
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let IP_TI = ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
// As there is potentially more than 1 indicator type for matching IP, taking NetworkIP first, then others if that is empty.
// Taking the first non-empty value based on potential IOC match availability
| extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, "NO_IP")
// Picking up only IOC's that contain the entities we want
| where TI_ipEntity != "NO_IP"
// Exclude local addresses, using the ipv4_is_private operator
| where ipv4_is_private(TI_ipEntity) == false and TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127."
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now();
let IP_TI_list = toscalar(IP_TI
| summarize NIoCs = dcount(TI_ipEntity), IoCs = make_set(TI_ipEntity)
| project IoCs = iff(NIoCs > HAS_ANY_MAX, dynamic([]), IoCs));
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_WebSession (starttime = ago(dt_lookBack), srcipaddr_has_any_prefix = IP_TI_list)
| where isnotempty(SrcIpAddr)
// renaming time column so it is clear the log this came from
| extend imNWS_TimeGenerated = TimeGenerated
)
on $left.TI_ipEntity == $right.SrcIpAddr
| where imNWS_TimeGenerated < ExpirationDateTime
| summarize imNWS_TimeGenerated = arg_max(imNWS_TimeGenerated, *) by IndicatorId, DstIpAddr
| project imNWS_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore,
TI_ipEntity, Dvc, SrcIpAddr, DstIpAddr, Url, Type
name: TI map IP entity to Web Session Events (ASIM Web Session schema)
alertDetailsOverride:
alertDisplayNameFormat: The IP {{SrcIpAddr}} of the web request matches an IP IoC
alertDescriptionFormat: The source address {{SrcIpAddr}} of the web request for the URL {{Url}} matches a known indicator of compromise of {{ThreatType}}. Consult the threat intelligence feed for more information about the indicator.
severity: Medium
queryFrequency: 1h
triggerOperator: gt
customDetails:
EventTime: imNWS_TimeGenerated
IoCConfidenceScore: ConfidenceScore
ThreatType: ThreatType
IoCExpirationTime: ExpirationDateTime
IoCDescription: Description
ActivityGroupNames: ActivityGroupNames
IndicatorId: IndicatorId
relevantTechniques:
- T1071
version: 1.2.5
description: |
This rule identifies Web Sessions for which the source IP address is a known IoC. This rule uses the [Advanced Security Information Model (ASIM)](https://aka.ms/AboutASIM) and supports any web session source that complies with ASIM.
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_imWebSession.yaml
requiredDataConnectors:
- connectorId: SquidProxy
dataTypes:
- SquidProxy_CL
- connectorId: Zscaler
dataTypes:
- CommonSecurityLog
- connectorId: ThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: MicrosoftDefenderThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
entityMappings:
- fieldMappings:
- identifier: Address
columnName: DstIpAddr
entityType: IP
tactics:
- CommandAndControl
queryPeriod: 14d
query: |
let HAS_ANY_MAX = 10000;
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let IP_TI = ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
// As there is potentially more than 1 indicator type for matching IP, taking NetworkIP first, then others if that is empty.
// Taking the first non-empty value based on potential IOC match availability
| extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, "NO_IP")
// Picking up only IOC's that contain the entities we want
| where TI_ipEntity != "NO_IP"
// Exclude local addresses, using the ipv4_is_private operator
| where ipv4_is_private(TI_ipEntity) == false and TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127."
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now();
let IP_TI_list = toscalar(IP_TI
| summarize NIoCs = dcount(TI_ipEntity), IoCs = make_set(TI_ipEntity)
| project IoCs = iff(NIoCs > HAS_ANY_MAX, dynamic([]), IoCs));
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_WebSession (starttime = ago(dt_lookBack), srcipaddr_has_any_prefix = IP_TI_list)
| where isnotempty(SrcIpAddr)
// renaming time column so it is clear the log this came from
| extend imNWS_TimeGenerated = TimeGenerated
)
on $left.TI_ipEntity == $right.SrcIpAddr
| where imNWS_TimeGenerated < ExpirationDateTime
| summarize imNWS_TimeGenerated = arg_max(imNWS_TimeGenerated, *) by IndicatorId, DstIpAddr
| project imNWS_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore,
TI_ipEntity, Dvc, SrcIpAddr, DstIpAddr, Url, Type
kind: Scheduled
triggerThreshold: 0
id: e2559891-383c-4caf-ae67-55a008b9f89e
{
"$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/e2559891-383c-4caf-ae67-55a008b9f89e')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/e2559891-383c-4caf-ae67-55a008b9f89e')]",
"properties": {
"alertDetailsOverride": {
"alertDescriptionFormat": "The source address {{SrcIpAddr}} of the web request for the URL {{Url}} matches a known indicator of compromise of {{ThreatType}}. Consult the threat intelligence feed for more information about the indicator.",
"alertDisplayNameFormat": "The IP {{SrcIpAddr}} of the web request matches an IP IoC"
},
"alertRuleTemplateName": "e2559891-383c-4caf-ae67-55a008b9f89e",
"customDetails": {
"ActivityGroupNames": "ActivityGroupNames",
"EventTime": "imNWS_TimeGenerated",
"IndicatorId": "IndicatorId",
"IoCConfidenceScore": "ConfidenceScore",
"IoCDescription": "Description",
"IoCExpirationTime": "ExpirationDateTime",
"ThreatType": "ThreatType"
},
"description": "This rule identifies Web Sessions for which the source IP address is a known IoC. This rule uses the [Advanced Security Information Model (ASIM)](https://aka.ms/AboutASIM) and supports any web session source that complies with ASIM.\n",
"displayName": "TI map IP entity to Web Session Events (ASIM Web Session schema)",
"enabled": true,
"entityMappings": [
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "DstIpAddr",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_imWebSession.yaml",
"query": "let HAS_ANY_MAX = 10000;\nlet dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet IP_TI = ThreatIntelligenceIndicator\n | where TimeGenerated >= ago(ioc_lookBack)\n // As there is potentially more than 1 indicator type for matching IP, taking NetworkIP first, then others if that is empty.\n // Taking the first non-empty value based on potential IOC match availability\n | extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, \"NO_IP\")\n // Picking up only IOC's that contain the entities we want\n | where TI_ipEntity != \"NO_IP\"\n // Exclude local addresses, using the ipv4_is_private operator\n | where ipv4_is_private(TI_ipEntity) == false and TI_ipEntity !startswith \"fe80\" and TI_ipEntity !startswith \"::\" and TI_ipEntity !startswith \"127.\"\n | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n | where Active == true and ExpirationDateTime > now();\nlet IP_TI_list = toscalar(IP_TI\n | summarize NIoCs = dcount(TI_ipEntity), IoCs = make_set(TI_ipEntity)\n | project IoCs = iff(NIoCs > HAS_ANY_MAX, dynamic([]), IoCs));\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 _Im_WebSession (starttime = ago(dt_lookBack), srcipaddr_has_any_prefix = IP_TI_list)\n | where isnotempty(SrcIpAddr)\n // renaming time column so it is clear the log this came from\n | extend imNWS_TimeGenerated = TimeGenerated\n )\n on $left.TI_ipEntity == $right.SrcIpAddr\n| where imNWS_TimeGenerated < ExpirationDateTime\n| summarize imNWS_TimeGenerated = arg_max(imNWS_TimeGenerated, *) by IndicatorId, DstIpAddr\n| project imNWS_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore,\n TI_ipEntity, Dvc, SrcIpAddr, DstIpAddr, Url, Type\n",
"queryFrequency": "PT1H",
"queryPeriod": "P14D",
"severity": "Medium",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CommandAndControl"
],
"techniques": [
"T1071"
],
"templateVersion": "1.2.5",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}