File Download Using Notepad++ GUP Utility

Title: File Download Using Notepad++ GUP Utility
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