Detection rules › Kusto

Corelight - External Proxy Detected

Status
available
Severity
low
Time window
1h
Source
github.com/Azure/Azure-Sentinel

'Detects external proxy usage.'

MITRE ATT&CK coverage

TacticTechniques
Command & ControlT1090 Proxy

Rule body kusto

id: 05850746-9ae4-412f-838b-844f0903f4a9
name: Corelight - External Proxy Detected
description: |
  'Detects external proxy usage.'
severity: Low
status: Available
requiredDataConnectors:
  - connectorId: Corelight
    dataTypes:
      - Corelight_v2_http
      - corelight_http
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
  - DefenseEvasion
  - CommandAndControl
relevantTechniques:
  - T1090 
query: |
  corelight_http
  | where isnotempty(proxied)
  | where not(ipv4_is_private(id_orig_h))
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: id_orig_h
version: 2.1.0
kind: Scheduled

Stages and Predicates

Stage 1: source

corelight_http

Stage 2: where

| where isnotempty(proxied)

Stage 3: where

| where not(ipv4_is_private(id_orig_h))

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

FieldKindExcluded values
id_orig_hcidr_match10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 169.254.0.0/16, 127.0.0.0/8

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.

FieldKindValues
proxiedis_not_null
  • (no value, null check)