Enterprise password reused via Google Chrome outside corporate resources

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You need to search for scenarios where a user has reused their enterprise password outside corporate resources by using their password on a URL not included on a list of allowed enterprise login sites. Within Google Chrome, this is indicated by the event type passwordReuseEvent.

Required data

Ensure you are using the recommended Splunk Common Information Model (CIM) Data Loss Prevention data model. Content developed by the Splunk Security Research team requires the use of consistent, normalized data provided by the CIM. For information on installing and using the CIM, see the Common Information Model documentation.

Procedure

Use field mapping to correlate the fields:

Field	CIM alias
device_user	src_user
event	signature
device_name	dest
user_agent	-
result	action
url	-
reason	category
os_platform	-
browser_version	-
device_id	dvc
client_type	vendor_product
time	-
trigger_user	object
profile_user	user

3. Look for examples of activity, for example:

{
  "device_user": "test_user_4",
  "event": "passwordReuseEvent",
  "device_name": "Alices-gMacBookPro",
  "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36",
  "result": "WARNED",
  "url": "https://login.domain.com/request?s=up.domain.com:443/uberproxy/F7Vi6p8gOMFZhB/&d=https://prosper.domain.com/%3Futm_source%3Dgo%26utm_medium%3Dgo%26upxsrf%3DAO9zFu0_8tEdjdn22qpYZpI4UpLljTti3jMD2zrqzrjI1aXpng:1611683186843&maxAge=60&authLevel=2000000&keyIds=zRI,s8x,xSS,Caq",
  "reason": "PASSWORD_REUSED_UNAUTHORIZED_SITE",
  "os_platform": "Mac OS X 10.15",
  "browser_version": "87.0.4280.141",
  "device_id": "C02D9CTCMD6M",
  "client_type": "CHROME_BROWSER",
  "time": "1611665190",
  "trigger_user": "test_user_4@domain.test"
}

Next steps

Events that appear should be investigated further and assessed against your organizational policies in this area.

Finally, you might be interested in other processes associated with the Improving Google Chrome security use case.