Conhost.exe CommandLine Path Traversal

Status: test
Severity: high
Log source: category process_creation, product windows
Author: Nasreddine Bencherchali (Nextron Systems)
Source: github.com/SigmaHQ/sigma

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

Known false positives

Unlikely

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059.003` Command and Scripting Interpreter: Windows Command Shell

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation

Rule body

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

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    ParentCommandLine|contains: 'conhost'
    CommandLine|contains: '/../../'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`/../../` corpus 2 (sigma 2)	`field:"CommandLine" kind:match value:"/../../"`
`ParentCommandLine`	match	`conhost`	`field:"ParentCommandLine" kind:match value:"conhost"`

Conhost.exe CommandLine Path Traversal

Known false positives

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection

Indicators

Stage 0: `condition`

Stage 1: `selection`