Esentutl Steals Browser Information

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

Query · sigma

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*

Known false positives

  • Legitimate use
Raw source Esentutl Steals Browser Information · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
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

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