Detection rules › Kusto
Ubiquiti - connection to non-corporate DNS server
'Detects connections to non-corporate DNS servers.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Command & Control | |
| Exfiltration |
Rule body
id: fe232837-9bdc-4e2b-8c08-cdac2610eed3
name: Ubiquiti - connection to non-corporate DNS server
description: |
'Detects connections to non-corporate DNS servers.'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: CustomLogsAma
dataTypes:
- Ubiquiti_CL
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- CommandAndControl
- Exfiltration
relevantTechniques:
- T1572
- T1041
query: |
let corp_dns = dynamic(['127.0.0.2']);
UbiquitiAuditEvent
| where DstPortNumber == '53'
| where DstIpAddr !in (corp_dns)
| extend IPCustomEntity = SrcIpAddr
entityMappings:
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPCustomEntity
version: 1.0.2
kind: Scheduled
Stages and Predicates
Parameters
let corp_dns = dynamic(['127.0.0.2']);
Stage 1: source
UbiquitiAuditEvent
Stage 2: where
| where DstPortNumber == '53'
Stage 3: where
| where DstIpAddr !in (corp_dns)
Stage 4: extend
| extend IPCustomEntity = SrcIpAddr
Exclusions
The rule actively suppresses these predicates.
| Field | Kind | Excluded values | Search |
|---|---|---|---|
DstIpAddr | eq | corp_dns | excludes:DstIpAddr field:"DstIpAddr" value:"corp_dns" |
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
DstPortNumber | eq |
| field:"DstPortNumber" kind:eq value:"53" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
IPCustomEntity | extend |