Esentutl Steals Browser Information — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: medium. Source dates: 2022-02-13 / 2024-03-05.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: dc21b45d9947e210b4cfdf764549bb5563bfc9ec305b439d7ceb441855ce75c3

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Esentutl Steals Browser Information
id: 6a69f62d-ce75-4b57-8dce-6351eb55b362
status: test
description: One way Qbot steals sensitive information is by extracting browser data from Internet Explorer and Microsoft Edge by using the built-in utility esentutl.exe
references:
    - https://thedfirreport.com/2022/02/07/qbot-likes-to-move-it-move-it/
    - https://redcanary.com/threat-detection-report/threats/qbot/
    - https://thedfirreport.com/2022/10/31/follina-exploit-leads-to-domain-compromise/
author: frack113
date: 2022-02-13
modified: 2024-03-05
tags:
    - attack.collection
    - attack.t1005
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\esentutl.exe'
        - OriginalFileName: 'esentutl.exe'
    selection_flag:
        CommandLine|contains|windash: '-r'
    selection_webcache:
        CommandLine|contains: '\Windows\WebCache'
    condition: all of selection*
falsepositives:
    - Legitimate use
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate use

Source references

• https://thedfirreport.com/2022/02/07/qbot-likes-to-move-it-move-it/
• https://redcanary.com/threat-detection-report/threats/qbot/
• https://thedfirreport.com/2022/10/31/follina-exploit-leads-to-domain-compromise/