Windows: Uncommon Process Access to Chromium User Data Cookies and History

title: "Windows: Uncommon Process Access to Chromium User Data Cookies and History"
id: 57caa2f3-9fcf-410a-a66f-3707ca18e928
status: test
description: This rule flags file access events where an unusual process reads Chromium browser sensitive user data files, including Cookies, History, Network Cookies, and Web Data. Such access can indicate attempts to steal or recover sensitive browser artifacts used for credential and session information. The detection relies on Windows file access telemetry (Kernel File ETW) that includes the accessed file path and the initiating process image.
references:
  - Internal Research
  - https://github.com/SigmaHQ/sigma/blob/master/rules-threat-hunting/windows/file/file_access/file_access_win_browsers_chromium_sensitive_files.yml
author: X__Junior (Nextron Systems), Huntrule Team
date: 2024-07-29
tags:
  - attack.t1003
  - attack.credential-access
  - detection.threat-hunting
logsource:
  category: file_access
  product: windows
  definition: "Requirements: Microsoft-Windows-Kernel-File ETW provider"
detection:
  selection:
    FileName|contains:
      - \User Data\Default\Cookies
      - \User Data\Default\History
      - \User Data\Default\Network\Cookies
      - \User Data\Default\Web Data
  filter_main_system:
    Image: System
  filter_main_generic:
    Image|startswith:
      - C:\Program Files (x86)\
      - C:\Program Files\
      - C:\Windows\system32\
      - C:\Windows\SysWOW64\
  filter_optional_defender:
    Image|startswith: C:\ProgramData\Microsoft\Windows Defender\
    Image|endswith:
      - \MpCopyAccelerator.exe
      - \MsMpEng.exe
  condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
  - Antivirus, Anti-Spyware, Anti-Malware Software
  - Backup software
  - Legitimate software installed on partitions other than "C:\"
  - Searching software such as "everything.exe"
level: low
license: DRL-1.1
related:
  - id: c5f37810-a85f-4186-81e9-33f23abb4141
    type: derived