Detection rules › Sigma
Cab File Extraction Via Wusa.EXE From Potentially Suspicious Paths
Detects the execution of the "wusa.exe" (Windows Update Standalone Installer) utility to extract ".cab" files using the "/extract" argument from potentially suspicious paths.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | No specific technique |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
title: Cab File Extraction Via Wusa.EXE From Potentially Suspicious Paths
id: c74c0390-3e20-41fd-a69a-128f0275a5ea
related:
- id: 59b39960-5f9d-4a49-9cef-1e4d2c1d0cb9
type: derived
status: test
description: |
Detects the execution of the "wusa.exe" (Windows Update Standalone Installer) utility to extract ".cab" files using the "/extract" argument from potentially suspicious paths.
references:
- https://web.archive.org/web/20180331144337/https://www.fireeye.com/blog/threat-research/2018/03/sanny-malware-delivery-method-updated-in-recently-observed-attacks.html
- https://www.echotrail.io/insights/search/wusa.exe/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-05
modified: 2023-11-28
tags:
- attack.execution
logsource:
category: process_creation
product: windows
detection:
selection_root:
Image|endswith: '\wusa.exe'
CommandLine|contains: '/extract:'
selection_paths:
CommandLine|contains:
- ':\PerfLogs\'
- ':\Users\Public\'
- ':\Windows\Temp\'
- '\Appdata\Local\Temp\'
# - '\Desktop\'
# - '\Downloads\'
condition: all of selection_*
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_root
selection_root:
Image|endswith: '\wusa.exe'
CommandLine|contains: '/extract:'
Stage 2: selection_paths
selection_paths:
CommandLine|contains:
- ':\PerfLogs\'
- ':\Users\Public\'
- ':\Windows\Temp\'
- '\Appdata\Local\Temp\'
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 | match |
|
Image | ends_with |
|