OneLogin Application Password Revealed

Severity: high
Type: Alert
Time window: 1h
Match by: userid
Author: Google Cloud Security
Source: github.com/chronicle/detection-rules

Detects when a user revealed another user's application password.

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1552` Unsecured Credentials

References

https://onelogin.service-now.com/kb_view_customer.do?sysparm_article=KB0010598

Rule body

// Copyright 2024 Google LLC. Licensed under Apache-2.0.

 rule onelogin_application_password_revealed {

  meta:
    author = "Google Cloud Security"
    description = "Detects when a user revealed another user's application password."
    rule_id = "mr_785c2d0e-067e-4ad6-a27b-91d0af644718"
    rule_name = "OneLogin Application Password Revealed"
    reference = "https://onelogin.service-now.com/kb_view_customer.do?sysparm_article=KB0010598"
    mitre_attack_tactic = "Credential Access"
    mitre_attack_technique = "Unsecured Credentials"
    mitre_attack_url = "https://attack.mitre.org/techniques/T1552/"
    mitre_attack_version = "v15.1"
    type = "Alert"
    data_source = "OneLogin"
    severity = "High"
    priority = "High"

  events:
    $password.metadata.event_type = "USER_RESOURCE_ACCESS"
    $password.metadata.product_name = "ONELOGIN_SSO"
    $password.metadata.vendor_name = "ONELOGIN"
    $password.principal.user.userid != $password.target.user.userid //different users
    $password.metadata.product_event_type = "240" //actor_user revealed password to an app for user
    $password.principal.user.userid = $userid

  match:
    $userid over 1h

  outcome:
    $risk_score = max(75)
    $mitre_attack_tactic = "Credential Access"
    $mitre_attack_technique = "Unsecured Credentials"
    $principal_ip = array_distinct($password.principal.ip)
    $principal_ip_country = array_distinct($password.principal.ip_geo_artifact.location.country_or_region)
    $principal_ip_state = array_distinct($password.principal.ip_geo_artifact.location.state)
    $principal_user_userid = array_distinct($password.principal.user.userid)
    $principal_user_user_display_name = array_distinct($password.principal.user.user_display_name)
    $target_user_userid = array_distinct($password.target.user.userid)
    $target_user_user_display_name = array_distinct($password.target.user.user_display_name)
    $target_application = array_distinct($password.target.application)

  condition:
    $password
}

YARA-L rule structure

Condition

Fires when at least one $password event in the 1h window.

Events

`$password` `USER_RESOURCE_ACCESS`

metadata.product_event_type = "240"

Match and correlation

Joined on: $password.principal.user.userid != $password.target.user.userid
Match key: $userid (principal.user.userid)
Within: 1h

Outcome

Outcome variables add context to a detection. When the rule generates an alert, $risk_score is displayed with it.

Field	Expression
`risk_score`	`max(75)`
`principal_ip`	`array_distinct($password.principal.ip)`
`principal_ip_country`	`array_distinct($password.principal.ip_geo_artifact.location.country_or_region)`
`principal_ip_state`	`array_distinct($password.principal.ip_geo_artifact.location.state)`
`principal_user_userid`	`array_distinct($password.principal.user.userid)`
`principal_user_user_display_name`	`array_distinct($password.principal.user.user_display_name)`
`target_user_userid`	`array_distinct($password.target.user.userid)`
`target_user_user_display_name`	`array_distinct($password.target.user.user_display_name)`
`target_application`	`array_distinct($password.target.application)`