Conhost.exe CommandLine Path Traversal

Hunt Hypothesis

detects the usage of path traversal in conhost.exe indicating possible command/argument confusion/hijacking

Detection Rule

Sigma (Original)

title: Conhost.exe CommandLine Path Traversal
id: ee5e119b-1f75-4b34-add8-3be976961e39
status: test
description: detects the usage of path traversal in conhost.exe indicating possible command/argument confusion/hijacking
references:
    - https://pentestlab.blog/2020/07/06/indirect-command-execution/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-06-14
tags:
    - attack.execution
    - attack.t1059.003
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentCommandLine|contains: 'conhost'
        CommandLine|contains: '/../../'
    condition: selection
falsepositives:
    - Unlikely
level: high

KQL (Azure Sentinel)

imProcessCreate
| where ActingProcessCommandLine contains "conhost" and TargetProcessCommandLine contains "/../../"

Required Data Sources

False Positive Guidance

• Unlikely

MITRE ATT&CK Context

• Tactic: Execution
• Technique: T1059.003 — T1059.003

References

• https://pentestlab.blog/2020/07/06/indirect-command-execution/
• SigmaHQ Rule