39 lines
1.2 KiB
YAML
39 lines
1.2 KiB
YAML
title: Indirect Command Execution
|
|
author: E.M. Anhaus (originally from Atomic Blue Detections, Endgame), oscd.community
|
|
date: 2019/10/24
|
|
description: Detect indirect command execution via Program Compatibility Assistant
|
|
(pcalua.exe or forfiles.exe).
|
|
detection:
|
|
SELECTION_1:
|
|
EventID: 1
|
|
SELECTION_2:
|
|
ParentImage: '*\pcalua.exe'
|
|
SELECTION_3:
|
|
ParentImage: '*\forfiles.exe'
|
|
condition: (SELECTION_1 and (SELECTION_2 or SELECTION_3))
|
|
falsepositives:
|
|
- Need to use extra processing with 'unique_count' / 'filter' to focus on outliers
|
|
as opposed to commonly seen artifacts.
|
|
- Legitimate usage of scripts.
|
|
fields:
|
|
- ComputerName
|
|
- User
|
|
- ParentCommandLine
|
|
- CommandLine
|
|
id: fa47597e-90e9-41cd-ab72-c3b74cfb0d02
|
|
level: low
|
|
logsource:
|
|
category: process_creation
|
|
product: windows
|
|
modified: 2019/11/11
|
|
references:
|
|
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1202/T1202.md
|
|
- https://eqllib.readthedocs.io/en/latest/analytics/884a7ccd-7305-4130-82d0-d4f90bc118b6.html
|
|
status: experimental
|
|
tags:
|
|
- attack.defense_evasion
|
|
- attack.t1202
|
|
yml_filename: win_indirect_cmd.yml
|
|
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation
|
|
|