Nasreddine Bencherchali
2e689eca54
- Removed "Contains" modifier from "OriginalFileName" across all rules. - Added "Image" field back in the rules highlighted by Florian
43 lines
1.2 KiB
YAML
43 lines
1.2 KiB
YAML
title: NirCmd Tool Execution
|
|
id: 4e2ed651-1906-4a59-a78a-18220fca1b22
|
|
status: experimental
|
|
description: Detects the use of NirCmd tool for command execution, which could be the result of legitimate administrative activity
|
|
author: 'Florian Roth, Nasreddine Bencherchali @nas_bench'
|
|
date: 2022/01/24
|
|
modified: 2022/05/13
|
|
references:
|
|
- https://www.nirsoft.net/utils/nircmd.html
|
|
- https://www.winhelponline.com/blog/run-program-as-system-localsystem-account-windows/
|
|
- https://www.nirsoft.net/utils/nircmd2.html#using
|
|
tags:
|
|
- attack.execution
|
|
- attack.t1569.002
|
|
- attack.s0029
|
|
logsource:
|
|
category: process_creation
|
|
product: windows
|
|
detection:
|
|
selection_org:
|
|
OriginalFileName: 'NirCmd.exe'
|
|
combo_exec:
|
|
CommandLine|contains:
|
|
- ' exec '
|
|
- ' exec2 '
|
|
combo_exec_params:
|
|
CommandLine|contains:
|
|
- ' show '
|
|
- ' hide '
|
|
selection_cmd:
|
|
CommandLine|contains:
|
|
- ' execmd '
|
|
- '.exe script '
|
|
- '.exe shexec '
|
|
- ' runinteractive '
|
|
condition: (1 of selection*) or (combo_exec and combo_exec_params)
|
|
fields:
|
|
- CommandLine
|
|
- ParentCommandLine
|
|
falsepositives:
|
|
- Legitimate use by administrators
|
|
level: medium
|