Ransom Protect User Blocked

Back


Id	d5d4766b-e547-44da-9d85-48ff393db201
Rulename	Ransom Protect User Blocked
Description	Detects malicious users blocked by CTERA Ransom Protect AI engine.
Severity	High
Tactics	Impact
Techniques	T1486
Required data connectors	CTERA
Kind	NRT
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CTERA/Analytic Rules/RansomwareUserBlocked.yaml
Version	1.0.2
Arm template	d5d4766b-e547-44da-9d85-48ff393db201.json

KQL

Syslog
| where SyslogMessage contains "Ransom Protect mechanism blocked"
| extend 
    Portal = extract("portal:(\\w+)", 1, SyslogMessage),
    EdgeFiler = extract("Edge Filer:(\\w+-\\d+)", 1, SyslogMessage),
    IP = extract("IP:([0-9.]+)", 1, SyslogMessage),
    User = extract("user:(\\w+)", 1, SyslogMessage),
    BlockedTime = extract("at ([^ ]+)", 1, SyslogMessage)
| project TimeGenerated, Portal, EdgeFiler, IP, User, BlockedTime

YAML

entityMappings:
- fieldMappings:
  - columnName: User
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: IP
    identifier: Address
  entityType: IP
alertDetailsOverride:
  alertnameFormat: CTERA Ransom Protect User Blocked
  alertDescriptionFormat: CTERA Ransom Protect blocked a malicious user at {{TimeGenerated}}.
tactics:
- Impact
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    reopenClosedIncident: false
    matchingMethod: AllEntities
    lookbackDuration: PT5H
    enabled: false
suppressionDuration: PT5H
eventGroupingSettings:
  aggregationKind: SingleAlert
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CTERA/Analytic Rules/RansomwareUserBlocked.yaml
status: Available
version: 1.0.2
relevantTechniques:
- T1486
query: |
  Syslog
  | where SyslogMessage contains "Ransom Protect mechanism blocked"
  | extend 
      Portal = extract("portal:(\\w+)", 1, SyslogMessage),
      EdgeFiler = extract("Edge Filer:(\\w+-\\d+)", 1, SyslogMessage),
      IP = extract("IP:([0-9.]+)", 1, SyslogMessage),
      User = extract("user:(\\w+)", 1, SyslogMessage),
      BlockedTime = extract("at ([^ ]+)", 1, SyslogMessage)
  | project TimeGenerated, Portal, EdgeFiler, IP, User, BlockedTime  
severity: High
kind: NRT
name: Ransom Protect User Blocked
customDetails:
  EdgeFiler: EdgeFiler
id: d5d4766b-e547-44da-9d85-48ff393db201
description: Detects malicious users blocked by CTERA Ransom Protect AI engine.
suppressionEnabled: false
requiredDataConnectors:
- dataTypes:
  - Syslog
  connectorId: CTERA

ARM