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Windows Credentials from Password Stores Chrome Extension Access

The following analytic detects non-Chrome processes attempting to access the Chrome extensions file. It leverages Windows Security Event logs, specifically event code 4663, to identify this behavior. This activity is significant because adversaries may exploit this file to extract sensitive information from the Chrome browser, posing a security risk. If confirmed malicious, this could lead to unauthorized access to stored credentials and other sensitive data, potentially compromising the security of the affected system and broader network.

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Detection Logic

`wineventlog_security`
EventCode=4663
object_file_path="*\\AppData\\Local\\Google\\Chrome\\User Data\\Default\\Local Extension Settings\\*"
NOT process_path IN (
    "*:\\Windows\\explorer.exe",
    "*\\AppData\\Local\\Google\\Chrome Beta\\Application\\chrome.exe",
    "*\\AppData\\Local\\Google\\Chrome Dev\\Application\\chrome.exe",
    "*\\AppData\\Local\\Google\\Chrome SxS\\Application\\chrome.exe",
    "*\\AppData\\Local\\Google\\Chrome Unstable\\Application\\chrome.exe",
    "*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe"
)
| stats count min(_time) as firstTime
              max(_time) as lastTime

  by object_file_name object_file_path
     process_name process_path
     process_id EventCode dest
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `windows_credentials_from_password_stores_chrome_extension_access_filter`

False Positives

⚠ The chrome uninstaller will access these set of files and folders. Filter as needed.

Field Validations

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