DNS events related to ToR proxies ASIM DNS Schema
Id | 3fe3c520-04f1-44b8-8398-782ed21435f8 |
Rulename | DNS events related to ToR proxies (ASIM DNS Schema) |
Description | Identifies IP addresses performing DNS lookups associated with common ToR proxies. This analytic rule uses ASIM and supports any built-in or custom source that supports the ASIM DNS schema |
Severity | Low |
Tactics | Exfiltration |
Techniques | T1048 |
Required data connectors | AzureFirewall CiscoUmbrellaDataConnector Corelight DNS GCPDNSDataConnector InfobloxNIOS NXLogDnsLogs Zscaler |
Kind | Scheduled |
Query frequency | 1d |
Query period | 1d |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimDNS/imDNS_TorProxies.yaml |
Version | 1.3.4 |
Arm template | 3fe3c520-04f1-44b8-8398-782ed21435f8.json |
let torProxies=dynamic(["tor2web.org", "tor2web.com", "torlink.co", "onion.to", "onion.ink", "onion.cab", "onion.nu", "onion.link",
"onion.it", "onion.city", "onion.direct", "onion.top", "onion.casa", "onion.plus", "onion.rip", "onion.dog", "tor2web.fi",
"tor2web.blutmagie.de", "onion.sh", "onion.lu", "onion.pet", "t2w.pw", "tor2web.ae.org", "tor2web.io", "tor2web.xyz", "onion.lt",
"s1.tor-gateways.de", "s2.tor-gateways.de", "s3.tor-gateways.de", "s4.tor-gateways.de", "s5.tor-gateways.de", "hiddenservice.net"]);
_Im_Dns(domain_has_any=torProxies)
| extend HostName = tostring(split(Dvc, ".")[0]), DomainIndex = toint(indexof(Dvc, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(Dvc, DomainIndex + 1), Dvc)
| project-away DomainIndex
name: DNS events related to ToR proxies (ASIM DNS Schema)
severity: Low
queryFrequency: 1d
triggerOperator: gt
tags:
- version: 1.0.0
ParentAlert: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/DnsEvents/DNS_TorProxies.yaml
- Schema: ASIMDns
SchemaVersion: 0.1.1
relevantTechniques:
- T1048
version: 1.3.4
description: |
'Identifies IP addresses performing DNS lookups associated with common ToR proxies.
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM DNS schema'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimDNS/imDNS_TorProxies.yaml
requiredDataConnectors:
- connectorId: DNS
dataTypes:
- DnsEvents
- connectorId: AzureFirewall
dataTypes:
- AzureDiagnostics
- connectorId: Zscaler
dataTypes:
- CommonSecurityLog
- connectorId: InfobloxNIOS
dataTypes:
- Syslog
- connectorId: GCPDNSDataConnector
dataTypes:
- GCP_DNS_CL
- connectorId: NXLogDnsLogs
dataTypes:
- NXLog_DNS_Server_CL
- connectorId: CiscoUmbrellaDataConnector
dataTypes:
- Cisco_Umbrella_dns_CL
- connectorId: Corelight
dataTypes:
- Corelight_CL
entityMappings:
- fieldMappings:
- identifier: FullName
columnName: Dvc
- identifier: HostName
columnName: HostName
- identifier: DnsDomain
columnName: HostNameDomain
entityType: Host
- fieldMappings:
- identifier: Address
columnName: SrcIpAddr
entityType: IP
tactics:
- Exfiltration
queryPeriod: 1d
query: |
let torProxies=dynamic(["tor2web.org", "tor2web.com", "torlink.co", "onion.to", "onion.ink", "onion.cab", "onion.nu", "onion.link",
"onion.it", "onion.city", "onion.direct", "onion.top", "onion.casa", "onion.plus", "onion.rip", "onion.dog", "tor2web.fi",
"tor2web.blutmagie.de", "onion.sh", "onion.lu", "onion.pet", "t2w.pw", "tor2web.ae.org", "tor2web.io", "tor2web.xyz", "onion.lt",
"s1.tor-gateways.de", "s2.tor-gateways.de", "s3.tor-gateways.de", "s4.tor-gateways.de", "s5.tor-gateways.de", "hiddenservice.net"]);
_Im_Dns(domain_has_any=torProxies)
| extend HostName = tostring(split(Dvc, ".")[0]), DomainIndex = toint(indexof(Dvc, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(Dvc, DomainIndex + 1), Dvc)
| project-away DomainIndex
kind: Scheduled
metadata:
support:
tier: Community
source:
kind: Community
categories:
domains:
- Security - Network
author:
name: Yaron Fruchtmann
triggerThreshold: 0
id: 3fe3c520-04f1-44b8-8398-782ed21435f8
{
"$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/3fe3c520-04f1-44b8-8398-782ed21435f8')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/3fe3c520-04f1-44b8-8398-782ed21435f8')]",
"properties": {
"alertRuleTemplateName": "3fe3c520-04f1-44b8-8398-782ed21435f8",
"customDetails": null,
"description": "'Identifies IP addresses performing DNS lookups associated with common ToR proxies.\nThis analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM DNS schema'\n",
"displayName": "DNS events related to ToR proxies (ASIM DNS Schema)",
"enabled": true,
"entityMappings": [
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "Dvc",
"identifier": "FullName"
},
{
"columnName": "HostName",
"identifier": "HostName"
},
{
"columnName": "HostNameDomain",
"identifier": "DnsDomain"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "SrcIpAddr",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimDNS/imDNS_TorProxies.yaml",
"query": "let torProxies=dynamic([\"tor2web.org\", \"tor2web.com\", \"torlink.co\", \"onion.to\", \"onion.ink\", \"onion.cab\", \"onion.nu\", \"onion.link\", \n\"onion.it\", \"onion.city\", \"onion.direct\", \"onion.top\", \"onion.casa\", \"onion.plus\", \"onion.rip\", \"onion.dog\", \"tor2web.fi\", \n\"tor2web.blutmagie.de\", \"onion.sh\", \"onion.lu\", \"onion.pet\", \"t2w.pw\", \"tor2web.ae.org\", \"tor2web.io\", \"tor2web.xyz\", \"onion.lt\", \n\"s1.tor-gateways.de\", \"s2.tor-gateways.de\", \"s3.tor-gateways.de\", \"s4.tor-gateways.de\", \"s5.tor-gateways.de\", \"hiddenservice.net\"]);\n_Im_Dns(domain_has_any=torProxies)\n| extend HostName = tostring(split(Dvc, \".\")[0]), DomainIndex = toint(indexof(Dvc, '.'))\n| extend HostNameDomain = iff(DomainIndex != -1, substring(Dvc, DomainIndex + 1), Dvc)\n| project-away DomainIndex\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"severity": "Low",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Exfiltration"
],
"tags": [
{
"ParentAlert": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/DnsEvents/DNS_TorProxies.yaml",
"version": "1.0.0"
},
{
"Schema": "ASIMDns",
"SchemaVersion": "0.1.1"
}
],
"techniques": [
"T1048"
],
"templateVersion": "1.3.4",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}