Detection rules › Kusto

Cisco WSA - Suspected protocol abuse

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

'Detects possible protocol abuse.'

MITRE ATT&CK coverage

Rule body

id: 6f756792-4888-48a5-97cf-40d9430dc932
name: Cisco WSA - Suspected protocol abuse
description: |
  'Detects possible protocol abuse.'
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: SyslogAma
    datatypes:
      - Syslog
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Exfiltration
relevantTechniques:
  - T1048
query: |
  CiscoWSAEvent
  | where DstPortNumber !in ('80', '443')
  | where NetworkApplicationProtocol in~ ('HTTP', 'HTTPs')
  | extend IPCustomEntity = SrcIpAddr, AccountCustomEntity = SrcUserName
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPCustomEntity
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: AccountCustomEntity
version: 1.0.2
kind: Scheduled

Stages and Predicates

Stage 1: source

CiscoWSAEvent

Stage 2: where

| where DstPortNumber !in ('80', '443')

Stage 3: where

| where NetworkApplicationProtocol in~ ('HTTP', 'HTTPs')

Stage 4: extend

| extend IPCustomEntity = SrcIpAddr, AccountCustomEntity = SrcUserName

Exclusions

The rule actively suppresses these predicates.

Indicators

These rows show field, operator, and value matches.

Output fields

These fields are emitted when the rule matches.

FieldSource
AccountCustomEntityextend
IPCustomEntityextend