Sigma rule: Esentutl Steals Browser Information

Rule

Title

Esentutl Steals Browser Information

Status

test

Level

medium

Author

frack113

Date

2022-02-13

Modified

2024-03-05

File

rules/windows/process_creation/proc_creation_win_esentutl_webcache.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

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

Log source

product

windows

category

process_creation

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*

False positives (as the rule lists them)

• Legitimate use

Tags

• attack.collection
• attack.t1005

MITRE ATT&CK ids this rule names

• T1005

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/

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_esentutl_webcache.yml