Multiple Sources Affected by the Same TI Destination
Id | 4644baf7-3464-45dd-bd9d-e07687e25f81 |
Rulename | Multiple Sources Affected by the Same TI Destination |
Description | Identifies multiple machines trying to reach out to the same destination blocked by TI in Azure Firewall. This can indicate attack on the organization by the same attack group. Configurable Parameters: - Minimum affected threshold - alert only if more than this number of hosts affected. Default is set to 5. - Recommendation is to use the new resource specific logs. If you are using both, the TiTraffic Count will be duplicated. |
Severity | Medium |
Tactics | Exfiltration CommandAndControl |
Required data connectors | AzureFirewall |
Kind | Scheduled |
Query frequency | 1d |
Query period | 1d |
Trigger threshold | 1 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Firewall/Analytic Rules/Azure Firewall - Multiple Sources Affected by the Same TI Destination.yaml |
Version | 1.1.2 |
Arm template | 4644baf7-3464-45dd-bd9d-e07687e25f81.json |
let RunTime = 1d;
let StartRunTime = 1d;
let EndRunTime = StartRunTime - RunTime;
let MinAffectedThreshold = 5;
union isfuzzy=true
(AzureDiagnostics
| where TimeGenerated between (ago(StartRunTime) .. ago(EndRunTime))
| where OperationName == "AzureFirewallThreatIntelLog"
| parse msg_s with * "from " SourceIp ":" SourcePort:int " to " Fqdn ":" DestinationPort:int "." * "Action: Deny. " ThreatDescription),
(AZFWThreatIntel
| where TimeGenerated between (ago(StartRunTime) .. ago(EndRunTime)))
| summarize TiTrafficCount = count(), dCountSourceIps = dcount(SourceIp), AffectedIps = make_set(SourceIp, 10000) by Fqdn, ThreatDescription
| where array_length(AffectedIps) > MinAffectedThreshold
| mv-expand SourceIp = AffectedIps
| order by TiTrafficCount desc, Fqdn asc, parse_ipv4(tostring(SourceIp)) asc
severity: Medium
relevantTechniques: []
queryFrequency: 1d
kind: Scheduled
version: 1.1.2
name: Multiple Sources Affected by the Same TI Destination
triggerOperator: gt
description: |
'Identifies multiple machines trying to reach out to the same destination blocked by TI in Azure Firewall. This can indicate attack on the organization by the same attack group.
Configurable Parameters:
- Minimum affected threshold - alert only if more than this number of hosts affected. Default is set to 5.
- Recommendation is to use the new resource specific logs. If you are using both, the TiTraffic Count will be duplicated.'
queryPeriod: 1d
query: |
let RunTime = 1d;
let StartRunTime = 1d;
let EndRunTime = StartRunTime - RunTime;
let MinAffectedThreshold = 5;
union isfuzzy=true
(AzureDiagnostics
| where TimeGenerated between (ago(StartRunTime) .. ago(EndRunTime))
| where OperationName == "AzureFirewallThreatIntelLog"
| parse msg_s with * "from " SourceIp ":" SourcePort:int " to " Fqdn ":" DestinationPort:int "." * "Action: Deny. " ThreatDescription),
(AZFWThreatIntel
| where TimeGenerated between (ago(StartRunTime) .. ago(EndRunTime)))
| summarize TiTrafficCount = count(), dCountSourceIps = dcount(SourceIp), AffectedIps = make_set(SourceIp, 10000) by Fqdn, ThreatDescription
| where array_length(AffectedIps) > MinAffectedThreshold
| mv-expand SourceIp = AffectedIps
| order by TiTrafficCount desc, Fqdn asc, parse_ipv4(tostring(SourceIp)) asc
entityMappings:
- entityType: IP
fieldMappings:
- columnName: SourceIp
identifier: Address
- entityType: URL
fieldMappings:
- columnName: Fqdn
identifier: Url
tactics:
- Exfiltration
- CommandAndControl
status: Available
triggerThreshold: 1
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Firewall/Analytic Rules/Azure Firewall - Multiple Sources Affected by the Same TI Destination.yaml
id: 4644baf7-3464-45dd-bd9d-e07687e25f81
requiredDataConnectors:
- dataTypes:
- AzureDiagnostics
- AZFWThreatIntel
connectorId: AzureFirewall
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2023-02-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/4644baf7-3464-45dd-bd9d-e07687e25f81')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4644baf7-3464-45dd-bd9d-e07687e25f81')]",
"properties": {
"alertRuleTemplateName": "4644baf7-3464-45dd-bd9d-e07687e25f81",
"customDetails": null,
"description": "'Identifies multiple machines trying to reach out to the same destination blocked by TI in Azure Firewall. This can indicate attack on the organization by the same attack group.\n\nConfigurable Parameters:\n\n- Minimum affected threshold - alert only if more than this number of hosts affected. Default is set to 5.\n- Recommendation is to use the new resource specific logs. If you are using both, the TiTraffic Count will be duplicated.'\n",
"displayName": "Multiple Sources Affected by the Same TI Destination",
"enabled": true,
"entityMappings": [
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "SourceIp",
"identifier": "Address"
}
]
},
{
"entityType": "URL",
"fieldMappings": [
{
"columnName": "Fqdn",
"identifier": "Url"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Firewall/Analytic Rules/Azure Firewall - Multiple Sources Affected by the Same TI Destination.yaml",
"query": "let RunTime = 1d; \nlet StartRunTime = 1d; \nlet EndRunTime = StartRunTime - RunTime; \nlet MinAffectedThreshold = 5;\nunion isfuzzy=true\n(AzureDiagnostics \n| where TimeGenerated between (ago(StartRunTime) .. ago(EndRunTime))\n| where OperationName == \"AzureFirewallThreatIntelLog\"\n| parse msg_s with * \"from \" SourceIp \":\" SourcePort:int \" to \" Fqdn \":\" DestinationPort:int \".\" * \"Action: Deny. \" ThreatDescription),\n(AZFWThreatIntel\n| where TimeGenerated between (ago(StartRunTime) .. ago(EndRunTime)))\n| summarize TiTrafficCount = count(), dCountSourceIps = dcount(SourceIp), AffectedIps = make_set(SourceIp, 10000) by Fqdn, ThreatDescription\n| where array_length(AffectedIps) > MinAffectedThreshold\n| mv-expand SourceIp = AffectedIps\n| order by TiTrafficCount desc, Fqdn asc, parse_ipv4(tostring(SourceIp)) asc\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"severity": "Medium",
"status": "Available",
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CommandAndControl",
"Exfiltration"
],
"techniques": [],
"templateVersion": "1.1.2",
"triggerOperator": "GreaterThan",
"triggerThreshold": 1
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}