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

entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
tactics:
- Execution
- DefenseEvasion
requiredDataConnectors:
- dataTypes:
  - CyberArkEPM
  connectorId: CyberArkEPM
id: 16b940d2-aaf8-4eaa-a5e1-05df5f5c3d43
severity: Medium
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  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CyberArkEPM/Analytic Rules/CyberArkEPMNewProcessStartetFromSystem.yaml
kind: Scheduled
queryPeriod: 14d
version: 1.0.0
name: CyberArkEPM - Uncommon Windows process started from System folder
queryFrequency: 1h
triggerThreshold: 0
relevantTechniques:
- T1204
- T1036
description: |
    'Detects when uncommon windows proccess is started from System folder.'
triggerOperator: gt

ARM