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 |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 1: Process creation |
Rule body
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
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
CommandLine | ends_with |
| field:"CommandLine" kind:ends_with |
Image | ends_with |
| field:"Image" kind:ends_with value:"\Wuauclt.exe" |
OriginalFileName | eq |
| field:"OriginalFileName" kind:eq value:"Wuauclt.exe" |