Detection rules › Kusto
Cisco Umbrella - Connection to non-corporate private network
'IP addresses of broadband links that usually indicates users attempting to access their home network, for example for a remote session to a home computer.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Command & Control | No specific technique |
| Exfiltration | No specific technique |
Rule body kusto
id: c9b6d281-b96b-4763-b728-9a04b9fe1246
name: Cisco Umbrella - Connection to non-corporate private network
description: |
'IP addresses of broadband links that usually indicates users attempting to access their home network, for example for a remote session to a home computer.'
severity: Medium
requiredDataConnectors:
- connectorId: CiscoUmbrellaDataConnector
dataTypes:
- Cisco_Umbrella_proxy_CL
queryFrequency: 10m
queryPeriod: 10m
triggerOperator: gt
triggerThreshold: 0
tactics:
- CommandAndControl
- Exfiltration
query: |
let lbtime = 10m;
Cisco_Umbrella
| where TimeGenerated > ago(lbtime)
| where EventType == 'proxylogs'
| where DvcAction =~ 'Allowed'
| where UrlCategory has_any ('Dynamic and Residential', 'Personal VPN')
| project TimeGenerated, SrcIpAddr, Identities
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: Identities
- entityType: IP
fieldMappings:
- identifier: Address
columnName: SrcIpAddr
version: 1.1.1
kind: Scheduled
Stages and Predicates
Parameters
let lbtime = 10m;
Stage 1: source
Cisco_Umbrella
Stage 2: where
| where TimeGenerated > ago(lbtime)
Stage 3: where
| where EventType == 'proxylogs'
Stage 4: where
| where DvcAction =~ 'Allowed'
Stage 5: where
| where UrlCategory has_any ('Dynamic and Residential', 'Personal VPN')
Stage 6: project
| project TimeGenerated, SrcIpAddr, Identities
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
DvcAction | eq |
|
EventType | eq |
|
UrlCategory | match |
|
Output fields
Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.
| Field | Source |
|---|---|
Identities | project |
SrcIpAddr | project |
TimeGenerated | project |