Cisco SE - Ransomware Activity

Status: available
Severity: high
Time window: 15m
Source: github.com/Azure/Azure-Sentinel

'This rule is triggered when possible ransomware activity is detected on host.'

MITRE ATT&CK coverage

Tactic	Techniques
Impact	`T1486` Data Encrypted for Impact

Rule body

id: c9629114-0f49-4b50-9f1b-345287b2eebf
name: Cisco SE - Ransomware Activity
description: |
  'This rule is triggered when possible ransomware activity is detected on host.'
severity: High
requiredDataConnectors:
  - connectorId: CiscoSecureEndpoint
    dataTypes:
      - CiscoSecureEndpoint
queryFrequency: 15m
queryPeriod: 15m
triggerOperator: gt
triggerThreshold: 0
status: Available
tactics:
  - Impact
relevantTechniques:
  - T1486
query: |
  CiscoSecureEndpoint
  | where EventMessage has 'Suspected ransomware'
  | extend HostCustomEntity = DstHostname, MalwareCustomEntity = ThreatName
entityMappings:
  - entityType: Host
    fieldMappings:
      - identifier: HostName
        columnName: HostCustomEntity
  - entityType: Malware
    fieldMappings:
      - identifier: Name
        columnName: MalwareCustomEntity
version: 1.0.0
kind: Scheduled

Stages and Predicates

Stage 1: `source`

CiscoSecureEndpoint

Stage 2: `where`

| where EventMessage has 'Suspected ransomware'

Stage 3: `extend`

| extend HostCustomEntity = DstHostname, MalwareCustomEntity = ThreatName

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`EventMessage`	match	`Suspected ransomware` transforms: `term`	`field:"EventMessage" kind:match value:"Suspected ransomware"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`HostCustomEntity`	`extend`
`MalwareCustomEntity`	`extend`

Cisco SE - Ransomware Activity

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: extend

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend`