HTML File Opened From Download Folder

experimentallow
Log-Quelle: windows · process_creationAutor Joseph KamauDatum 2025-12-05
01

Beschreibung

Was dies ist, in Kürze.

Detects web browser process opening an HTML file from a user's Downloads folder. This behavior is could be associated with phishing attacks where threat actors send HTML attachments to users. When a user opens such an attachment, it can lead to the execution of malicious scripts or the download of malware. During investigation, analyze the HTML file for embedded scripts or links, check for any subsequent downloads or process executions, and investigate the source of the email or message containing the attachment.

02

Tags

attack.t1598.002attack.t1566.001attack.initial-accessattack.reconnaissancedetection.threat-hunting
03

Regelquelle (YAML)

title: HTML File Opened From Download Folder
id: 538c5851-8c03-4724-8ec4-623bc7aadaea
status: experimental
description: |
    Detects web browser process opening an HTML file from a user's Downloads folder.
    This behavior is could be associated with phishing attacks where threat actors send HTML attachments to users.
    When a user opens such an attachment, it can lead to the execution of malicious scripts or the download of malware.
    During investigation, analyze the HTML file for embedded scripts or links, check for any subsequent downloads or process executions, and investigate the source of the email or message containing the attachment.
references:
    - https://app.any.run/tasks/ae3c4ded-fd6a-43ed-8215-ba0ba574ad33
    - https://app.any.run/tasks/8901e2d5-0c5a-48ba-a8e9-10b5ed7e06f4
author: Joseph Kamau
date: 2025-12-05
tags:
    - attack.t1598.002
    - attack.t1566.001
    - attack.initial-access
    - attack.reconnaissance
    - detection.threat-hunting
logsource:
    product: windows
    category: process_creation
detection:
    selection:
        Image|endswith:
            - '\brave.exe'
            - '\chrome.exe'
            - '\firefox.exe'
            - '\msedge.exe'
            - '\opera.exe'
            - '\vivaldi.exe'
        CommandLine|contains|all:
            - ':\users\'
            - '\Downloads\'
            - '.htm'
    condition: selection
falsepositives:
    - Opening any HTML file located in users directories via a browser process will trigger this.
level: low
04

erkennt Techniken (2)

ATT&CK-Techniken, die dies ermöglicht oder abbildet.

05

Referenzen

Externe Belege — Patches, Meldungen, Analysen.