Detection rules › Sigma
Suspicious Windows Update Agent Empty Cmdline
Detects suspicious Windows Update Agent activity in which a wuauclt.exe process command line doesn't contain any command line flags
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth | T1036 Masquerading |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
Rule body yaml
title: Suspicious Windows Update Agent Empty Cmdline
id: 52d097e2-063e-4c9c-8fbb-855c8948d135
status: test
description: |
Detects suspicious Windows Update Agent activity in which a wuauclt.exe process command line doesn't contain any command line flags
references:
- https://redcanary.com/blog/blackbyte-ransomware/
author: Florian Roth (Nextron Systems)
date: 2022-02-26
modified: 2023-11-11
tags:
- attack.stealth
- attack.t1036
logsource:
category: process_creation
product: windows
detection:
selection_img:
- Image|endswith: '\Wuauclt.exe'
- OriginalFileName: 'Wuauclt.exe'
selection_cli:
CommandLine|endswith:
- 'Wuauclt'
- 'Wuauclt.exe'
condition: all of selection*
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
all of selection*Stage 1: selection_img
selection_img:
- Image|endswith: '\Wuauclt.exe'
- OriginalFileName: 'Wuauclt.exe'
Stage 2: selection_cli
selection_cli:
CommandLine|endswith:
- 'Wuauclt'
- 'Wuauclt.exe'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
CommandLine | ends_with |
|
Image | ends_with |
|
OriginalFileName | eq |
|