Authentication [3002] Class

Identity & Access Management Category

Authentication events report authentication session activities such as user attempts a logon or logoff, successfully or otherwise.
Note: a superscript "O" after a caption indicates attribute is an observable.
Name Caption Group Requirement Type Description
action Action primary Optional String The normalized caption of action_id.
ℹ️ This is the string sibling of enum attribute action_id.
action_id Action ID primary Recommended Integer The action taken by a control or other policy-based system leading to an outcome or disposition. An unknown action may still correspond to a known disposition. Refer to disposition_id for the outcome of the action.
0Unknown
The action was unknown. The disposition_id attribute may still be set to a non-unknown value, for example 'Custom Action', 'Challenge'.
1Allowed
The activity was allowed. The disposition_id attribute should be set to a value that conforms to this action, for example 'Allowed', 'Approved', 'Delayed', 'No Action', 'Count' etc.
2Denied
The attempted activity was denied. The disposition_id attribute should be set to a value that conforms to this action, for example 'Blocked', 'Rejected', 'Quarantined', 'Isolated', 'Dropped', 'Access Revoked, etc.
3Observed
The activity was observed, but neither explicitly allowed nor denied. This is common with IDS and EDR controls that report additional information on observed behavior such as TTPs. The disposition_id attribute should be set to a value that conforms to this action, for example 'Logged', 'Alert', 'Detected', 'Count', etc.
4Modified
The activity was modified, adjusted, or corrected. The disposition_id attribute should be set appropriately, for example 'Restored', 'Corrected', 'Delayed', 'Captcha', 'Tagged'.
99Other
The action is not mapped. See the action attribute which contains a data source specific value.
ℹ️ This is an enum attribute; its string sibling is action.
activity_id Activity ID classification Required Integer The normalized identifier of the activity that triggered the event.
0Unknown
The event activity is unknown.
1Logon
A new logon session was requested.
2Logoff
A logon session was terminated and no longer exists.
3Authentication Ticket
A Kerberos authentication ticket (TGT) was requested.
4Service Ticket Request
A Kerberos service ticket was requested.
5Service Ticket Renew
A Kerberos service ticket was renewed.
6Preauth
A preauthentication stage was engaged.
99Other
The event activity is not mapped. See the activity_name attribute, which contains a data source specific value.
ℹ️ This is an enum attribute; its string sibling is activity_name.
activity_name Activity classification Optional String The event activity name, as defined by the activity_id.
ℹ️ This is the string sibling of enum attribute activity_id.
actor Actor context Recommended Actor The actor object describes details about the user/role/process that was the source of the activity. Note that this is not the threat actor of a campaign but may be part of a campaign.
api API Details context Optional API Describes details about a typical API (Application Programming Interface) call.
attacks MITRE ATT&CK® Details primary Optional MITRE ATT&CK® Array An array of MITRE ATT&CK® objects describing identified tactics, techniques & sub-techniques.
auth_factors Authentication Factors context Optional Authentication Factor Array Describes a category of methods used for identity verification in an authentication attempt.
auth_protocol Auth Protocol primary Recommended String The authentication protocol as defined by the caption of auth_protocol_id. In the case of Other, it is defined by the event source.
ℹ️ This is the string sibling of enum attribute auth_protocol_id.
auth_protocol_id Auth Protocol ID primary Recommended Integer The normalized identifier of the authentication protocol used to create the user session.
0Unknown
The authentication protocol is unknown.
1NTLM
2Kerberos
3Digest
4OpenID
5SAML
6OAUTH 2.0
7PAP
8CHAP
9EAP
10RADIUS
11Basic Authentication
99Other
The authentication protocol is not mapped. See the auth_protocol attribute, which contains a data source specific value.
ℹ️ This is an enum attribute; its string sibling is auth_protocol.
authorizations Authorization Information primary Optional Authorization Result Array Provides details about an authorization, such as authorization outcome, and any associated policies related to the activity/event.
category_name Category classification Optional String The event category name, as defined by category_uid value: Identity & Access Management.
ℹ️ This is the string sibling of enum attribute category_uid.
category_uid Category ID classification Required Integer The category unique identifier of the event.
3Identity & Access Management
Identity & Access Management (IAM) events relate to the supervision of the system's authentication and access control model. Examples of such events are the success or failure of authentication, granting of authority, password change, entity change, privileged use etc.
ℹ️ This is an enum attribute; its string sibling is category_name.
certificate Certificate primary Recommended Digital Certificate The certificate associated with the authentication or pre-authentication (Kerberos).
class_name Class classification Optional String The event class name, as defined by class_uid value: Authentication.
ℹ️ This is the string sibling of enum attribute class_uid.
class_uid Class ID classification Required Integer The unique identifier of a class. A class describes the attributes available in an event.
3002Authentication
Authentication events report authentication session activities such as user attempts a logon or logoff, successfully or otherwise.
ℹ️ This is an enum attribute; its string sibling is class_name.
cloud Cloud primary Required Cloud Describes details about the Cloud environment where the event was originally created or logged.
confidence Confidence context Optional String The confidence, normalized to the caption of the confidence_id value. In the case of 'Other', it is defined by the event source.
ℹ️ This is the string sibling of enum attribute confidence_id.
confidence_id Confidence ID context Recommended Integer The normalized confidence refers to the accuracy of the rule that created the finding. A rule with a low confidence means that the finding scope is wide and may create finding reports that may not be malicious in nature.
0Unknown
The normalized confidence is unknown.
1Low
2Medium
3High
99Other
The confidence is not mapped to the defined enum values. See the confidence attribute, which contains a data source specific value.
ℹ️ This is an enum attribute; its string sibling is confidence.
confidence_score Confidence Score context Optional Integer The confidence score as reported by the event source.
count Count occurrence Optional Integer The number of times that events in the same logical group occurred during the event Start Time to End Time period.
device Device O primary Recommended Device An addressable device, computer system or host.
disposition Disposition primary Optional String The disposition name, normalized to the caption of the disposition_id value. In the case of 'Other', it is defined by the event source.
ℹ️ This is the string sibling of enum attribute disposition_id.
disposition_id Disposition ID primary Recommended Integer Describes the outcome or action taken by a security control, such as access control checks, malware detections or various types of policy violations.
0Unknown
The disposition is unknown.
1Allowed
Granted access or allowed the action to the protected resource.
2Blocked
Denied access or blocked the action to the protected resource.
3Quarantined
A suspicious file or other content was moved to a benign location.
4Isolated
A session was isolated on the network or within a browser.
5Deleted
A file or other content was deleted.
6Dropped
The request was detected as a threat and resulted in the connection being dropped.
7Custom Action
A custom action was executed such as running of a command script. Use the message attribute of the base class for details.
8Approved
A request or submission was approved. For example, when a form was properly filled out and submitted. This is distinct from 1 'Allowed'.
9Restored
A quarantined file or other content was restored to its original location.
10Exonerated
A suspicious or risky entity was deemed to no longer be suspicious (re-scored).
11Corrected
A corrupt file or configuration was corrected.
12Partially Corrected
A corrupt file or configuration was partially corrected.
13Uncorrected
A corrupt file or configuration was not corrected.
14Delayed
An operation was delayed, for example if a restart was required to finish the operation.
15Detected
Suspicious activity or a policy violation was detected without further action.
16No Action
The outcome of an operation had no action taken.
17Logged
The operation or action was logged without further action.
18Tagged
A file or other entity was marked with extended attributes.
19Alert
The request or activity was detected as a threat and resulted in a notification but request was not blocked.
20Count
Counted the request or activity but did not determine whether to allow it or block it.
21Reset
The request was detected as a threat and resulted in the connection being reset.
22Captcha
Required the end user to solve a CAPTCHA puzzle to prove that a human being is sending the request.
23Challenge
Ran a silent challenge that required the client session to verify that it's a browser, and not a bot.
24Access Revoked
The requestor's access has been revoked due to security policy enforcements. Note: use the Host profile if the User or Actor requestor is not present in the event class.
25Rejected
A request or submission was rejected. For example, when a form was improperly filled out and submitted. This is distinct from 2 'Blocked'.
26Unauthorized
An attempt to access a resource was denied due to an authorization check that failed. This is a more specific disposition than 2 'Blocked' and can be complemented with the authorizations attribute for more detail.
27Error
An error occurred during the processing of the activity or request. Use the message attribute of the base class for details.
99Other
The disposition is not mapped. See the disposition attribute, which contains a data source specific value.
ℹ️ This is an enum attribute; its string sibling is disposition.
dst_endpoint Destination Endpoint O primary Recommended (†) Network Endpoint The endpoint to which the authentication was targeted.
duration Duration Milliseconds occurrence Optional Long The event duration or aggregate time, the amount of time the event covers from start_time to end_time in milliseconds.
end_time End Time occurrence Optional Timestamp The end time of a time period, or the time of the most recent event included in the aggregate event.
end_time_dt End Time occurrence Optional Datetime The end time of a time period, or the time of the most recent event included in the aggregate event.
enrichments Enrichments context Optional Enrichment Array The additional information from an external data source, which is associated with the event or a finding. For example add location information for the IP address in the DNS answers:

[{"name": "answers.ip", "value": "92.24.47.250", "type": "location", "data": {"city": "Socotra", "continent": "Asia", "coordinates": [-25.4153, 17.0743], "country": "YE", "desc": "Yemen"}}]
firewall_rule Firewall Rule primary Optional Firewall Rule The firewall rule that pertains to the control that triggered the event, if applicable.
http_request HTTP Request context Optional HTTP Request Details about the underlying HTTP request.
http_response HTTP Response context Optional HTTP Response Details about the underlying HTTP response.
is_alert Alert primary Recommended Boolean Indicates that the event is considered to be an alertable signal. Should be set to true if disposition_id = Alert among other dispositions, and/or risk_level_id or severity_id of the event is elevated. Not all control events will be alertable, for example if disposition_id = Exonerated or disposition_id = Allowed.
is_cleartext Cleartext Credentials context Optional Boolean Indicates whether the credentials were passed in clear text.

Note: True if the credentials were passed in a clear text protocol such as FTP or TELNET, or if Windows detected that a user's logon password was passed to the authentication package in clear text.
is_mfa Multi Factor Authentication primary Recommended Boolean Indicates whether Multi Factor Authentication was used during authentication.
is_new_logon New Logon context Optional Boolean Indicates logon is from a device not seen before or a first time account logon.
is_remote Remote primary Recommended Boolean The attempted authentication is over a remote connection.
logon_process Logon Process O context Optional Process The trusted process that validated the authentication credentials.
logon_type Logon Type primary Recommended String The logon type, normalized to the caption of the logon_type_id value. In the case of 'Other', it is defined by the event source.
ℹ️ This is the string sibling of enum attribute logon_type_id.
logon_type_id Logon Type ID primary Recommended Integer The normalized logon type identifier.
0Unknown
The logon type is unknown.
1System
Used only by the System account, for example at system startup.
2Interactive
A local logon to device console.
3Network
A user or device logged onto this device from the network.
4Batch
A batch server logon, where processes may be executing on behalf of a user without their direct intervention.
5OS Service
A logon by a service or daemon that was started by the OS.
7Unlock
A user unlocked the device.
8Network Cleartext
A user logged on to this device from the network. The user's password in the authentication package was not hashed.
9New Credentials
A caller cloned its current token and specified new credentials for outbound connections. The new logon session has the same local identity, but uses different credentials for other network connections.
10Remote Interactive
A remote logon using Terminal Services or remote desktop application.
11Cached Interactive
A user logged on to this device with network credentials that were stored locally on the device and the domain controller was not contacted to verify the credentials.
12Cached Remote Interactive
Same as Remote Interactive. This is used for internal auditing.
13Cached Unlock
Workstation logon.
99Other
The logon type is not mapped. See the logon_type attribute, which contains a data source specific value.
ℹ️ This is an enum attribute; its string sibling is logon_type.
malware Malware primary Optional Malware Array A list of Malware objects, describing details about the identified malware.
message Message primary Recommended String The description of the event/finding, as defined by the source.
metadata Metadata context Required Metadata The metadata associated with the event or a finding.
observables Observables primary Recommended Observable Array The observables associated with the event or a finding.

References
OCSF Observables FAQ
osint OSINT primary Required OSINT Array The OSINT (Open Source Intelligence) object contains details related to an indicator such as the indicator itself, related indicators, geolocation, registrar information, subdomains, analyst commentary, and other contextual information. This information can be used to further enrich a detection or finding by providing decisioning support to other analysts and engineers.
policy Policy primary Optional Policy The policy that pertains to the control that triggered the event, if applicable. For example the name of an anti-malware policy or an access control policy.
raw_data Raw Data context Optional String The raw event/finding data as received from the source.
risk_details Risk Details context Optional String Describes the risk associated with the finding.
risk_level Risk Level context Optional String The risk level, normalized to the caption of the risk_level_id value.
ℹ️ This is the string sibling of enum attribute risk_level_id.
risk_level_id Risk Level ID context Optional Integer The normalized risk level id.
0Info
1Low
2Medium
3High
4Critical
99Other
The risk level is not mapped. See the risk_level attribute, which contains a data source specific value.
ℹ️ This is an enum attribute; its string sibling is risk_level.
risk_score Risk Score context Optional Integer The risk score as reported by the event source.
service Service primary Recommended (†) Service The service or gateway to which the user or process is being authenticated
session Session primary Recommended Session The authenticated user or service session.
severity Severity classification Optional String The event/finding severity, normalized to the caption of the severity_id value. In the case of 'Other', it is defined by the source.
ℹ️ This is the string sibling of enum attribute severity_id.
severity_id Severity ID classification Required Integer

The normalized identifier of the event/finding severity.

The normalized severity is a measurement the effort and expense required to manage and resolve an event or incident. Smaller numerical values represent lower impact events, and larger numerical values represent higher impact events.
0Unknown
The event/finding severity is unknown.
1Informational
Informational message. No action required.
2Low
The user decides if action is needed.
3Medium
Action is required but the situation is not serious at this time.
4High
Action is required immediately.
5Critical
Action is required immediately and the scope is broad.
6Fatal
An error occurred but it is too late to take remedial action.
99Other
The event/finding severity is not mapped. See the severity attribute, which contains a data source specific value.
ℹ️ This is an enum attribute; its string sibling is severity.
src_endpoint Source Endpoint O primary Recommended Network Endpoint Details about the source of the IAM activity.
start_time Start Time occurrence Optional Timestamp The start time of a time period, or the time of the least recent event included in the aggregate event.
start_time_dt Start Time occurrence Optional Datetime The start time of a time period, or the time of the least recent event included in the aggregate event.
status Status primary Recommended String The event status, normalized to the caption of the status_id value. In the case of 'Other', it is defined by the event source.
ℹ️ This is the string sibling of enum attribute status_id.
status_code Status Code primary Recommended String The event status code, as reported by the event source.

For example, in a Windows Failed Authentication event, this would be the value of 'Failure Code', e.g. 0x18.
status_detail Status Detail primary Recommended String The details about the authentication request. For example, possible details for Windows logon or logoff events are:
  • Success
    • LOGOFF_USER_INITIATED
    • LOGOFF_OTHER
  • Failure
    • USER_DOES_NOT_EXIST
    • INVALID_CREDENTIALS
    • ACCOUNT_DISABLED
    • ACCOUNT_LOCKED_OUT
    • PASSWORD_EXPIRED
status_id Status ID primary Recommended Integer The normalized identifier of the event status.
0Unknown
The status is unknown.
1Success
2Failure
99Other
The event status is not mapped. See the status attribute, which contains a data source specific value.
ℹ️ This is an enum attribute; its string sibling is status.
time Event Time occurrence Required Timestamp The normalized event occurrence time or the finding creation time.
time_dt Event Time occurrence Optional Datetime The normalized event occurrence time or the finding creation time.
timezone_offset Timezone Offset occurrence Recommended Integer The number of minutes that the reported event time is ahead or behind UTC, in the range -1,080 to +1,080.
type_name Type Name classification Optional String The event/finding type name, as defined by the type_uid.
ℹ️ This is the string sibling of enum attribute type_uid.
type_uid Type ID classification Required Long The event/finding type ID. It identifies the event's semantics and structure. The value is calculated by the logging system as: class_uid * 100 + activity_id.
300200Authentication: Unknown
300201Authentication: Logon
A new logon session was requested.
300202Authentication: Logoff
A logon session was terminated and no longer exists.
300203Authentication: Authentication Ticket
A Kerberos authentication ticket (TGT) was requested.
300204Authentication: Service Ticket Request
A Kerberos service ticket was requested.
300205Authentication: Service Ticket Renew
A Kerberos service ticket was renewed.
300206Authentication: Preauth
A preauthentication stage was engaged.
300299Authentication: Other
ℹ️ This is an enum attribute; its string sibling is type_name.
unmapped Unmapped Data context Optional Object The attributes that are not mapped to the event schema. The names and values of those attributes are specific to the event source.
user User O primary Required User The subject (user/role or account) to authenticate.
Constraints
† At least one of these attributes must be present: dst_endpoint, service
Profiles
Applicable profiles: Cloud, Date/Time, Host, OSINT, Security Control, Data Classification, Container, Linux Users.
Attribute Associations
actor.user: src_endpoint
src_endpoint: actor.user
dst_endpoint: user
user: dst_endpoint