OpenWith.exe Executes Specified Binary

Status: test
Severity: high
Log source: category process_creation, product windows
Author: Beyu Denis, oscd.community (rule), @harr0ey (idea)
Source: github.com/SigmaHQ/sigma

The OpenWith.exe executes other binary

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1218` System Binary Proxy Execution

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation
Security-Auditing	Event ID 4688: A new process has been created.

Rule body

title: OpenWith.exe Executes Specified Binary
id: cec8e918-30f7-4e2d-9bfa-a59cc97ae60f
status: test
description: The OpenWith.exe executes other binary
references:
    - https://github.com/LOLBAS-Project/LOLBAS/blob/4db780e0f0b2e2bb8cb1fa13e09196da9b9f1834/yml/LOLUtilz/OSBinaries/Openwith.yml
    - https://twitter.com/harr0ey/status/991670870384021504
author: Beyu Denis, oscd.community (rule), @harr0ey (idea)
date: 2019-10-12
modified: 2021-11-27
tags:
    - attack.stealth
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\OpenWith.exe'
        CommandLine|contains: '/c'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    Image|endswith: '\OpenWith.exe'
    CommandLine|contains: '/c'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`/c` corpus 15 (sigma 13, splunk 2)	`field:"CommandLine" kind:match value:"/c"`
`Image`	ends_with	`\OpenWith.exe`	`field:"Image" kind:ends_with value:"\OpenWith.exe"`

OpenWith.exe Executes Specified Binary

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection

Indicators

Stage 0: `condition`

Stage 1: `selection`