Windows Uncommon Processes Access Chromium Browser Cookie and History Files

title: Windows Uncommon Processes Access Chromium Browser Cookie and History Files
id: 57caa2f3-9fcf-410a-a66f-3707ca18e928
status: test
description: This rule flags file access to Chromium browser sensitive data paths, including Default Cookies, History, Network Cookies, and Web Data. Such access from uncommon applications can indicate attempts to steal or reuse browser-stored information. It relies on Windows file access telemetry (Microsoft-Windows-Kernel-File via ETW), matching the target file paths while excluding accesses by expected system and commonly benign application directories.
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