File Download Using Notepad++ GUP Utility

Description

Detects execution of the Notepad++ updater (gup) from a process other than Notepad++ to download files.

Query · sigma

selection_img:
- Image|endswith: \GUP.exe
- OriginalFileName: gup.exe
selection_cli:
  CommandLine|contains|all:
  - ' -unzipTo '
  - http
filter:
  ParentImage|endswith: \notepad++.exe
condition: all of selection* and not filter

Known false positives

  • Other parent processes other than notepad++ using GUP that are not currently identified
Raw source File Download Using Notepad++ GUP Utility · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: File Download Using Notepad++ GUP Utility
id: 44143844-0631-49ab-97a0-96387d6b2d7c
status: test
description: Detects execution of the Notepad++ updater (gup) from a process other than Notepad++ to download files.
references:
    - https://twitter.com/nas_bench/status/1535322182863179776
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-06-10
modified: 2023-03-02
tags:
    - attack.command-and-control
    - attack.t1105
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\GUP.exe'
        - OriginalFileName: 'gup.exe'
    selection_cli:
        CommandLine|contains|all:
            - ' -unzipTo '
            - 'http'
    filter:
        ParentImage|endswith: '\notepad++.exe'
    condition: all of selection* and not filter
falsepositives:
    - Other parent processes other than notepad++ using GUP that are not currently identified
level: high

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