CyberArkEPM - Uncommon Windows process started from System folder

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Id	16b940d2-aaf8-4eaa-a5e1-05df5f5c3d43
Rulename	CyberArkEPM - Uncommon Windows process started from System folder
Description	Detects when uncommon windows proccess is started from System folder.
Severity	Medium
Tactics	Execution DefenseEvasion
Techniques	T1204 T1036
Required data connectors	CyberArkEPM
Kind	Scheduled
Query frequency	1h
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CyberArkEPM/Analytic Rules/CyberArkEPMNewProcessStartetFromSystem.yaml
Version	1.0.0
Arm template	16b940d2-aaf8-4eaa-a5e1-05df5f5c3d43.json

KQL

let lb_period = 14d;
let q_time = 1h;
let sys_proc = CyberArkEPM
| where TimeGenerated between (ago(lb_period) .. ago(q_time))
| where EventSubType != 'AttackAttempt'
| where ActingProcessName has @'\'
| where ActingProcessName has_any ('System32', 'SysWOW64')
| summarize makeset(ActingProcessFileInternalName);
CyberArkEPM
| where TimeGenerated > ago(q_time)
| where EventSubType != 'AttackAttempt'
| where ActingProcessName has @'\'
| where ActingProcessName has_any ('System32', 'SysWOW64')
| where ActingProcessFileInternalName !in (sys_proc)
| extend AccountCustomEntity = ActorUsername

YAML

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CyberArkEPM/Analytic Rules/CyberArkEPMNewProcessStartetFromSystem.yaml
queryFrequency: 1h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
requiredDataConnectors:
- dataTypes:
  - CyberArkEPM
  connectorId: CyberArkEPM
description: |
    'Detects when uncommon windows proccess is started from System folder.'
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
tactics:
- Execution
- DefenseEvasion
relevantTechniques:
- T1204
- T1036
id: 16b940d2-aaf8-4eaa-a5e1-05df5f5c3d43
name: CyberArkEPM - Uncommon Windows process started from System folder
query: |
  let lb_period = 14d;
  let q_time = 1h;
  let sys_proc = CyberArkEPM
  | where TimeGenerated between (ago(lb_period) .. ago(q_time))
  | where EventSubType != 'AttackAttempt'
  | where ActingProcessName has @'\'
  | where ActingProcessName has_any ('System32', 'SysWOW64')
  | summarize makeset(ActingProcessFileInternalName);
  CyberArkEPM
  | where TimeGenerated > ago(q_time)
  | where EventSubType != 'AttackAttempt'
  | where ActingProcessName has @'\'
  | where ActingProcessName has_any ('System32', 'SysWOW64')
  | where ActingProcessFileInternalName !in (sys_proc)
  | extend AccountCustomEntity = ActorUsername  
version: 1.0.0
severity: Medium
kind: Scheduled

ARM