WARNING THIS IS A EXPERIMENTAL object

We have not been able to test, simulate, or build datasets for this object. Use at your own risk. This analytic is NOT supported.

Try in Splunk Security Cloud

Description

This search detects Okta login failures due to bad credentials for multiple users originating from the same ip address.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2020-07-21
  • Author: Rico Valdez, Splunk
  • ID: 19cba45f-cad3-4032-8911-0c09e0444552

Annotations

ATT&CK
ID Technique Tactic
T1078 Valid Accounts Defense Evasion, Initial Access, Persistence, Privilege Escalation
T1078.001 Default Accounts Defense Evasion, Initial Access, Persistence, Privilege Escalation
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 16
CVE
1
2
3
4
5
6
7
`okta` outcome.reason=INVALID_CREDENTIALS 
| rename client.geographicalContext.country as country, client.geographicalContext.state as state, client.geographicalContext.city as city 
| stats min(_time) as firstTime max(_time) as lastTime dc(user) as distinct_users values(user) as users by src_ip, displayMessage, outcome.reason, country, state, city  
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
|  search distinct_users > 5
| `multiple_okta_users_with_invalid_credentials_from_the_same_ip_filter` 

Macros

The SPL above uses the following Macros:

Note that multiple_okta_users_with_invalid_credentials_from_the_same_ip_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

  • _time
  • outcome.reason
  • client.geographicalContext.country
  • client.geographicalContext.state
  • client.geographicalContext.city
  • user
  • src_ip
  • displayMessage

How To Implement

This search is specific to Okta and requires Okta logs are being ingested in your Splunk deployment.

Known False Positives

A single public IP address servicing multiple legitmate users may trigger this search. In addition, the threshold of 5 distinct users may be too low for your needs. You may modify the included filter macro multiple_okta_users_with_invalid_credentials_from_the_same_ip_filter to raise the threshold or except specific IP adresses from triggering this search.

Associated Analytic story

RBA

Risk Score Impact Confidence Message
25.0 50 50 tbd

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 2