Suspicious Process Start Locations

Hunt Hypothesis

Detects suspicious process run from unusual locations

Detection Rule

Sigma (Original)

title: Suspicious Process Start Locations
id: 15b75071-74cc-47e0-b4c6-b43744a62a2b
status: test
description: Detects suspicious process run from unusual locations
references:
    - https://car.mitre.org/wiki/CAR-2013-05-002
author: juju4, Jonhnathan Ribeiro, oscd.community
date: 2019-01-16
modified: 2022-01-07
tags:
    - attack.stealth
    - attack.t1036
    - car.2013-05-002
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - Image|contains:
              - ':\RECYCLER\'
              - ':\SystemVolumeInformation\'
        - Image|startswith:
              - 'C:\Windows\Tasks\'
              - 'C:\Windows\debug\'
              - 'C:\Windows\fonts\'
              - 'C:\Windows\help\'
              - 'C:\Windows\drivers\'
              - 'C:\Windows\addins\'
              - 'C:\Windows\cursors\'
              - 'C:\Windows\system32\tasks\'
    condition: selection
falsepositives:
    - False positives depend on scripts and administrative tools used in the monitored environment
level: medium

KQL (Azure Sentinel)

imProcessCreate
| where (TargetProcessName contains ":\\RECYCLER\\" or TargetProcessName contains ":\\SystemVolumeInformation\\") or (TargetProcessName startswith "C:\\Windows\\Tasks\\" or TargetProcessName startswith "C:\\Windows\\debug\\" or TargetProcessName startswith "C:\\Windows\\fonts\\" or TargetProcessName startswith "C:\\Windows\\help\\" or TargetProcessName startswith "C:\\Windows\\drivers\\" or TargetProcessName startswith "C:\\Windows\\addins\\" or TargetProcessName startswith "C:\\Windows\\cursors\\" or TargetProcessName startswith "C:\\Windows\\system32\\tasks\\")

Required Data Sources

False Positive Guidance

• False positives depend on scripts and administrative tools used in the monitored environment

MITRE ATT&CK Context

• Technique: T1036 — T1036

References

• https://car.mitre.org/wiki/CAR-2013-05-002
• SigmaHQ Rule