Okta User Rejected Multiple Push Notifications

Severity: medium
Type: Alert
Time window: 10m
Match by: userid
Author: Google Cloud Security
Source: github.com/chronicle/detection-rules

Detects when an Okta user rejects more than 2 Push notifications in a 10 minute window.

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1110` Brute Force

References

https://sec.okta.com/pushfatigueworkflows

Event coverage

Provider	Event
Okta-user	user.authentication.auth_via_mfa
Okta-user	user.mfa.okta_verify.deny_push

Rules detecting the same action

Other rules on this platform that filter on the same API call or operation.

First Occurrence of Okta User Session Started via Proxy (Elastic)
MFA Fatigue (OKTA) (Kusto)
Okta AiTM Phishing Attempt Blocked by FastPass (Panther)
Okta Fast Pass phishing Detection (Kusto)
Okta FastPass Phishing Detection (Sigma)
Okta FastPass Phishing Detection (Elastic)
Okta MFA Bruteforce Attack (YARA-L)
Okta Mismatch Between Source And Response For Verify Push Request (YARA-L)

Rule body yaral

/*
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

rule okta_user_rejected_multiple_push_notifications {

  meta:
    author = "Google Cloud Security"
    description = "Detects when an Okta user rejects more than 2 Push notifications in a 10 minute window."
    rule_id = "mr_4d8ac05a-0d73-4d81-a5a1-470d2bd7d725"
    rule_name = "Okta User Rejected Multiple Push Notifications"
    reference = "https://sec.okta.com/pushfatigueworkflows"
    mitre_attack_tactic = "Credential Access"
    mitre_attack_technique = "Brute Force"
    mitre_attack_url = "https://attack.mitre.org/techniques/T1110/"
    mitre_attack_version = "v13.1"
    type = "Alert"
    data_source = "Okta"
    severity = "Medium"
    priority = "Medium"

  events:
    $login.metadata.product_name = "Okta"
    $login.metadata.vendor_name = "Okta"
    $login.metadata.event_type = "USER_UNCATEGORIZED"
    ($login.metadata.product_event_type = "user.mfa.okta_verify.deny_push" and $login.security_result.summary = "User rejected Okta push verify") or
    ($login.metadata.product_event_type = "user.authentication.auth_via_mfa" and $login.security_result.detection_fields["factor"] = "OKTA_VERIFY_PUSH")
    $login.security_result.action = "BLOCK"
    $login.principal.user.userid = $userid

  match:
    $userid over 10m

  outcome:
    $risk_score = max(35)
    $mitre_attack_tactic = "Credential Access"
    $mitre_attack_technique = "Brute Force"
    $target_user_agent = array_distinct($login.network.http.user_agent)
    $principal_ip = array_distinct($login.principal.ip)
    $principal_ip_country = array_distinct($login.principal.ip_geo_artifact.location.country_or_region)
    $principal_ip_state = array_distinct($login.principal.ip_geo_artifact.location.state)
    $principal_ip_city = array_distinct($login.principal.location.city)
    $principal_user_email_addresses = array_distinct ($login.principal.user.email_addresses)
    $security_result_summary = array_distinct($login.security_result.summary)

  condition:
    #login >= 2
}

Detection logic

Fires when $login occurs at least 2 times in the 10m window.

Events

`$login` `USER_UNCATEGORIZED`

metadata.product_event_type = "user.mfa.okta_verify.deny_push"
security_result.summary = "User rejected Okta push verify"
metadata.product_event_type = "user.authentication.auth_via_mfa"
security_result.detection_fields["factor"] = "OKTA_VERIFY_PUSH"
security_result.action = "BLOCK"

Correlation

Match key: $userid (principal.user.userid)
Within: 10m

Outcome

Fields the detection emits on a match. $risk_score drives alerting; Chronicle surfaces the rest on the detection.

Field	Expression
`risk_score`	`max(35)`
`target_user_agent`	`array_distinct($login.network.http.user_agent)`
`principal_ip`	`array_distinct($login.principal.ip)`
`principal_ip_country`	`array_distinct($login.principal.ip_geo_artifact.location.country_or_region)`
`principal_ip_state`	`array_distinct($login.principal.ip_geo_artifact.location.state)`
`principal_ip_city`	`array_distinct($login.principal.location.city)`
`principal_user_email_addresses`	`array_distinct ($login.principal.user.email_addresses)`
`security_result_summary`	`array_distinct($login.security_result.summary)`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

Okta User Rejected Multiple Push Notifications

MITRE ATT&CK coverage

References

Event coverage

Rules detecting the same action

Rule body yaral

Detection logic

Events

`$login` `USER_UNCATEGORIZED`

Correlation

Outcome

Keyboard shortcuts

Search operators

Okta User Rejected Multiple Push Notifications

MITRE ATT&CK coverage

References

Event coverage

Rules detecting the same action

Rule body yaral

Detection logic

Events

$login USER_UNCATEGORIZED

Correlation

Outcome

`$login` `USER_UNCATEGORIZED`