Analytic rule catalog
Datazag - retro-hunt historical DNS against impersonation indicators
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| Id | 2d7b90c5-41ae-4f83-a6d2-9b1c5e3407fa |
| Rulename | Datazag - retro-hunt historical DNS against impersonation indicators |
| Description | Matches Datazag impersonation indicators against historical ASIM-normalized DNS to surface domains resolved inside the estate before the feed was connected. Adjust dns_lookback to your DNS retention. Requires ASIM DNS parsers. |
| Tactics | InitialAccess CommandAndControl |
| Techniques | T1566 T1071 |
| Required data connectors | ThreatIntelligenceTaxii |
| Kind | Hunting |
| Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Datazag/Hunting%20Queries/DatazagRetroHunt_DNS.yaml |
| Version | 1.0.0 |
| Arm template | 2d7b90c5-41ae-4f83-a6d2-9b1c5e3407fa.json |
let datazag_identity = "identity--55a5a448-c6f1-5128-bc71-4d85b719131e";
let dns_lookback = 90d;
let confidence_floor = 85;
let DatazagDomains =
ThreatIntelIndicators
| where tostring(Data.created_by_ref) == datazag_identity
| where ObservableKey == "domain-name:value"
| where isnotempty(ObservableValue)
| summarize arg_max(TimeGenerated, *) by Id
| where IsDeleted == false
| where tostring(Data.revoked) != "true"
| where Confidence >= confidence_floor
| extend IndicatorDomain = tolower(trim_end(@"\.", ObservableValue))
| project
IndicatorDomain,
DatazagAlertRef = tostring(Data.external_references[0].external_id),
Confidence,
IndicatorEvidence = tostring(Data.labels),
IndicatorFirstPublished = todatetime(Data.created);
let DnsActivity =
_Im_Dns
| where TimeGenerated >= ago(dns_lookback)
| where isnotempty(DnsQuery)
| extend IndicatorDomain = tolower(trim_end(@"\.", DnsQuery))
| project
DnsTime = TimeGenerated,
IndicatorDomain,
SrcIpAddr = column_ifexists("SrcIpAddr", ""),
SrcHostname = column_ifexists("SrcHostname", ""),
SrcUsername = column_ifexists("SrcUsername", ""),
SrcUsernameType = column_ifexists("SrcUsernameType", "");
DatazagDomains
| join kind=innerunique DnsActivity on IndicatorDomain
| summarize
FirstResolved = min(DnsTime),
LastResolved = max(DnsTime),
QueryCount = count(),
SourceIps = make_set(SrcIpAddr, 100),
SourceHosts = make_set(SrcHostname, 100),
Upns = make_set_if(SrcUsername, SrcUsernameType == "UPN", 100)
by IndicatorDomain, DatazagAlertRef, Confidence, IndicatorEvidence, IndicatorFirstPublished
| extend
SourceIp = tostring(SourceIps[0]),
SourceHost = tostring(SourceHosts[0]),
AccountUpn = tostring(Upns[0]),
HostsAffected = array_length(SourceHosts),
DaysBeforeIndicator = datetime_diff('day', IndicatorFirstPublished, FirstResolved)
| order by FirstResolved asc
id: 2d7b90c5-41ae-4f83-a6d2-9b1c5e3407fa
requiredDataConnectors:
- connectorId: ThreatIntelligenceTaxii
dataTypes:
- ThreatIntelIndicators
description: |
Matches Datazag impersonation indicators against historical ASIM-normalized DNS to surface domains resolved inside the estate before the feed was connected. Adjust dns_lookback to your DNS retention. Requires ASIM DNS parsers.
name: Datazag - retro-hunt historical DNS against impersonation indicators
version: 1.0.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Datazag/Hunting%20Queries/DatazagRetroHunt_DNS.yaml
entityMappings:
- fieldMappings:
- identifier: DomainName
columnName: IndicatorDomain
entityType: DNS
- fieldMappings:
- identifier: Address
columnName: SourceIp
entityType: IP
- fieldMappings:
- identifier: HostName
columnName: SourceHost
entityType: Host
- fieldMappings:
- identifier: FullName
columnName: AccountUpn
entityType: Account
tactics:
- InitialAccess
- CommandAndControl
kind: Hunting
relevantTechniques:
- T1566
- T1071
query: |
let datazag_identity = "identity--55a5a448-c6f1-5128-bc71-4d85b719131e";
let dns_lookback = 90d;
let confidence_floor = 85;
let DatazagDomains =
ThreatIntelIndicators
| where tostring(Data.created_by_ref) == datazag_identity
| where ObservableKey == "domain-name:value"
| where isnotempty(ObservableValue)
| summarize arg_max(TimeGenerated, *) by Id
| where IsDeleted == false
| where tostring(Data.revoked) != "true"
| where Confidence >= confidence_floor
| extend IndicatorDomain = tolower(trim_end(@"\.", ObservableValue))
| project
IndicatorDomain,
DatazagAlertRef = tostring(Data.external_references[0].external_id),
Confidence,
IndicatorEvidence = tostring(Data.labels),
IndicatorFirstPublished = todatetime(Data.created);
let DnsActivity =
_Im_Dns
| where TimeGenerated >= ago(dns_lookback)
| where isnotempty(DnsQuery)
| extend IndicatorDomain = tolower(trim_end(@"\.", DnsQuery))
| project
DnsTime = TimeGenerated,
IndicatorDomain,
SrcIpAddr = column_ifexists("SrcIpAddr", ""),
SrcHostname = column_ifexists("SrcHostname", ""),
SrcUsername = column_ifexists("SrcUsername", ""),
SrcUsernameType = column_ifexists("SrcUsernameType", "");
DatazagDomains
| join kind=innerunique DnsActivity on IndicatorDomain
| summarize
FirstResolved = min(DnsTime),
LastResolved = max(DnsTime),
QueryCount = count(),
SourceIps = make_set(SrcIpAddr, 100),
SourceHosts = make_set(SrcHostname, 100),
Upns = make_set_if(SrcUsername, SrcUsernameType == "UPN", 100)
by IndicatorDomain, DatazagAlertRef, Confidence, IndicatorEvidence, IndicatorFirstPublished
| extend
SourceIp = tostring(SourceIps[0]),
SourceHost = tostring(SourceHosts[0]),
AccountUpn = tostring(Upns[0]),
HostsAffected = array_length(SourceHosts),
DaysBeforeIndicator = datetime_diff('day', IndicatorFirstPublished, FirstResolved)
| order by FirstResolved asc
{
"$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/2d7b90c5-41ae-4f83-a6d2-9b1c5e3407fa')]",
"kind": "Hunting",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/2d7b90c5-41ae-4f83-a6d2-9b1c5e3407fa')]",
"properties": {
"alertRuleTemplateName": "2d7b90c5-41ae-4f83-a6d2-9b1c5e3407fa",
"customDetails": null,
"description": "Matches Datazag impersonation indicators against historical ASIM-normalized DNS to surface domains resolved inside the estate before the feed was connected. Adjust dns_lookback to your DNS retention. Requires ASIM DNS parsers.\n",
"displayName": "Datazag - retro-hunt historical DNS against impersonation indicators",
"enabled": true,
"entityMappings": [
{
"entityType": "DNS",
"fieldMappings": [
{
"columnName": "IndicatorDomain",
"identifier": "DomainName"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "SourceIp",
"identifier": "Address"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "SourceHost",
"identifier": "HostName"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountUpn",
"identifier": "FullName"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Datazag/Hunting%20Queries/DatazagRetroHunt_DNS.yaml",
"query": "let datazag_identity = \"identity--55a5a448-c6f1-5128-bc71-4d85b719131e\";\nlet dns_lookback = 90d;\nlet confidence_floor = 85;\nlet DatazagDomains =\n ThreatIntelIndicators\n | where tostring(Data.created_by_ref) == datazag_identity\n | where ObservableKey == \"domain-name:value\"\n | where isnotempty(ObservableValue)\n | summarize arg_max(TimeGenerated, *) by Id\n | where IsDeleted == false\n | where tostring(Data.revoked) != \"true\"\n | where Confidence >= confidence_floor\n | extend IndicatorDomain = tolower(trim_end(@\"\\.\", ObservableValue))\n | project\n IndicatorDomain,\n DatazagAlertRef = tostring(Data.external_references[0].external_id),\n Confidence,\n IndicatorEvidence = tostring(Data.labels),\n IndicatorFirstPublished = todatetime(Data.created);\nlet DnsActivity =\n _Im_Dns\n | where TimeGenerated >= ago(dns_lookback)\n | where isnotempty(DnsQuery)\n | extend IndicatorDomain = tolower(trim_end(@\"\\.\", DnsQuery))\n | project\n DnsTime = TimeGenerated,\n IndicatorDomain,\n SrcIpAddr = column_ifexists(\"SrcIpAddr\", \"\"),\n SrcHostname = column_ifexists(\"SrcHostname\", \"\"),\n SrcUsername = column_ifexists(\"SrcUsername\", \"\"),\n SrcUsernameType = column_ifexists(\"SrcUsernameType\", \"\");\nDatazagDomains\n| join kind=innerunique DnsActivity on IndicatorDomain\n| summarize\n FirstResolved = min(DnsTime),\n LastResolved = max(DnsTime),\n QueryCount = count(),\n SourceIps = make_set(SrcIpAddr, 100),\n SourceHosts = make_set(SrcHostname, 100),\n Upns = make_set_if(SrcUsername, SrcUsernameType == \"UPN\", 100)\n by IndicatorDomain, DatazagAlertRef, Confidence, IndicatorEvidence, IndicatorFirstPublished\n| extend\n SourceIp = tostring(SourceIps[0]),\n SourceHost = tostring(SourceHosts[0]),\n AccountUpn = tostring(Upns[0]),\n HostsAffected = array_length(SourceHosts),\n DaysBeforeIndicator = datetime_diff('day', IndicatorFirstPublished, FirstResolved)\n| order by FirstResolved asc\n",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CommandAndControl",
"InitialAccess"
],
"techniques": [
"T1071",
"T1566"
],
"templateVersion": "1.0.0"
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}