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Detection rules › Sigma

LPE InstallerFileTakeOver PoC CVE-2021-41379

Status
test
Severity
high
Log source
product windows, service application
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects PoC tool used to exploit LPE vulnerability CVE-2021-41379

Known false positives

  • Other MSI packages for which your admins have used that name

MITRE ATT&CK coverage

TacticTechniques
Initial Access

Telemetry coverage

ProviderRecord / event type
MsiInstallerEvent ID 1033: Windows Installer installed the product.

Rule body

title: LPE InstallerFileTakeOver PoC CVE-2021-41379
id: 7dbb86de-a0cc-494c-8aa8-b2996c9ef3c8
status: test
description: Detects PoC tool used to exploit LPE vulnerability CVE-2021-41379
references:
    - https://web.archive.org/web/20220421061949/https://github.com/klinix5/InstallerFileTakeOver
author: Florian Roth (Nextron Systems)
date: 2021-11-22
modified: 2022-07-12
tags:
    - attack.initial-access
    - attack.t1190
    - detection.emerging-threats
logsource:
    product: windows
    service: application
    # warning: The 'data' field used in the detection section is the container for the event data as a whole. You may have to adapt the rule for your backend accordingly
detection:
    selection:
        EventID: 1033
        Provider_Name: 'MsiInstaller'
        Data|contains: 'test pkg'
    condition: selection
falsepositives:
    - Other MSI packages for which your admins have used that name
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 1033
    Provider_Name: 'MsiInstaller'
    Data|contains: 'test pkg'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
Datamatch
  • test pkg
field:"Data" kind:match value:"test pkg"
Provider_Nameeq
  • MsiInstaller corpus 5 (sigma 5)
field:"Provider_Name" kind:eq value:"MsiInstaller"