Silverfort - Log4Shell Incident

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Id	d6abed70-4043-46da-9304-a98f3446fa5f
Rulename	Silverfort - Log4Shell Incident
Description	Vulnerability allows attackers to execute arbitrary code on affected systems by exploiting a flaw in the way Log4j handles log messages containing specially crafted strings
Severity	High
Tactics	InitialAccess
Techniques	T1190
Required data connectors	SilverfortAma
Kind	Scheduled
Query frequency	15m
Query period	15m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Silverfort/Analytic Rules/Log4Shell.yaml
Version	1.0.0
Arm template	d6abed70-4043-46da-9304-a98f3446fa5f.json

KQL

CommonSecurityLog 
| where DeviceVendor has 'Silverfort'
| where DeviceProduct has 'Admin Console'
| where DeviceEventClassID == "NewIncident"
| where Message has "Log4Shell"
| extend UserName = parse_json(replace('^""|""$', '', Message))['userName']

YAML

severity: High
queryFrequency: 15m
description: |
    'Vulnerability allows attackers to execute arbitrary code on affected systems by exploiting a flaw in the way Log4j handles log messages containing specially crafted strings'
query: |-
  CommonSecurityLog 
  | where DeviceVendor has 'Silverfort'
  | where DeviceProduct has 'Admin Console'
  | where DeviceEventClassID == "NewIncident"
  | where Message has "Log4Shell"
  | extend UserName = parse_json(replace('^""|""$', '', Message))['userName']  
triggerThreshold: 0
kind: Scheduled
name: Silverfort - Log4Shell Incident
relevantTechniques:
- T1190
requiredDataConnectors:
- connectorId: SilverfortAma
  dataTypes:
  - CommonSecurityLog
version: 1.0.0
id: d6abed70-4043-46da-9304-a98f3446fa5f
queryPeriod: 15m
triggerOperator: gt
entityMappings:
- fieldMappings:
  - columnName: UserName
    identifier: Name
  entityType: Account
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Silverfort/Analytic Rules/Log4Shell.yaml
tactics:
- InitialAccess

ARM