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Email Activity (4009)

Email events report activities of emails.

  • Category: Network Activity
  • Extends: base_event
  • UID: 4009

Attributes

Section titled “Attributes”

Classification

Section titled “Classification”

category_uid

  • Type: integer_t
  • Requirement: required
  • Values:
    • 4 - Network Activity: Network Activity events.

The category unique identifier of the event.

class_uid

  • Type: integer_t
  • Requirement: required
  • Values:
    • 4009 - Email Activity: Email events report activities of emails.

The unique identifier of a class. A Class describes the attributes available in an event.

severity_id

  • Type: integer_t
  • Requirement: required
  • Values:
    • 0 - Unknown: The event/finding severity is unknown.
    • 1 - Informational: Informational message. No action required.
    • 2 - Low: The user decides if action is needed.
    • 3 - Medium: Action is required but the situation is not serious at this time.
    • 4 - High: Action is required immediately.
    • 5 - Critical: Action is required immediately and the scope is broad.
    • 6 - Fatal: An error occurred but it is too late to take remedial action.
    • 99 - Other: The event/finding severity is not mapped. See the severity attribute, which contains a data source specific value.

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.

type_uid

  • Type: long_t
  • Requirement: required
  • Values:
    • 400900 - Email Activity: Unknown
    • 400901 - Email Activity: Send
    • 400902 - Email Activity: Receive
    • 400903 - Email Activity: Scan: Email being scanned (example: security scanning)
    • 400999 - Email Activity: Other

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.

activity_id

  • Type: integer_t
  • Requirement: optional
  • Values:
    • 0 - Unknown: The event activity is unknown.
    • 1 - Send
    • 2 - Receive
    • 3 - Scan: Email being scanned (example: security scanning)
    • 99 - Other: The event activity is not mapped. See the activity_name attribute, which contains a data source specific value.

The normalized identifier of the activity that triggered the event.

activity_name

  • Type: string_t
  • Requirement: optional

The event activity name, as defined by the activity_id.

category_name

  • Type: string_t
  • Requirement: optional

The event category name, as defined by category_uid value: Network Activity.

class_name

  • Type: string_t
  • Requirement: optional

The event class name, as defined by class_uid value: Email Activity.

severity

  • Type: string_t
  • Requirement: optional

The event/finding severity, normalized to the caption of the severity_id value. In the case of ‘Other’, it is defined by the source.

type_name

  • Type: string_t
  • Requirement: optional

The event/finding type name, as defined by the type_uid.

Context

Section titled “Context”

direction_id

  • Type: integer_t
  • Requirement: required
  • Values:
    • 0 - Unknown: The email direction is unknown.
    • 1 - Inbound: Email Inbound, from the Internet or outside network destined for an entity inside network.
    • 2 - Outbound: Email Outbound, from inside the network destined for an entity outside network.
    • 3 - Internal: Email Internal, from inside the network destined for an entity inside network.
    • 99 - Other: The direction is not mapped. See the direction attribute, which contains a data source specific value.

The direction of the email relative to the scanning host or organization.Email scanned at an internet gateway might be characterized as inbound to the organization from the Internet, outbound from the organization to the Internet, or internal within the organization. Email scanned at a workstation might be characterized as inbound to, or outbound from the workstation.

metadata

The metadata associated with the event or a finding.

api cloud

  • Type: api
  • Requirement: optional

Describes details about a typical API (Application Programming Interface) call.

attempt

  • Type: integer_t
  • Requirement: optional

The attempt number for attempting to deliver the email.

banner

  • Type: string_t
  • Requirement: optional

The initial SMTP connection response that a messaging server receives after it connects to a email server.

direction

  • Type: string_t
  • Requirement: optional

The direction of the email, as defined by the direction_id value.

enrichments

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"}}]

raw_data

  • Type: string_t
  • Requirement: optional

The raw event/finding data as received from the source.

unmapped

  • Type: object
  • Requirement: optional

The attributes that are not mapped to the event schema. The names and values of those attributes are specific to the event source.

Occurrence

Section titled “Occurrence”

time

  • Type: timestamp_t
  • Requirement: required

The normalized event occurrence time or the finding creation time.

timezone_offset

  • Type: integer_t
  • Requirement: recommended

The number of minutes that the reported event time is ahead or behind UTC, in the range -1,080 to +1,080.

count

  • Type: integer_t
  • Requirement: optional

The number of times that events in the same logical group occurred during the event Start Time to End Time period.

duration

  • Type: integer_t
  • Requirement: optional

The event duration or aggregate time, the amount of time the event covers from start_time to end_time in milliseconds.

end_time

  • Type: timestamp_t
  • Requirement: optional

The end time of a time period, or the time of the most recent event included in the aggregate event.

end_time_dt datetime

  • Type: datetime_t
  • Requirement: optional

The end time of a time period, or the time of the most recent event included in the aggregate event.

start_time

  • Type: timestamp_t
  • Requirement: optional

The start time of a time period, or the time of the least recent event included in the aggregate event.

start_time_dt datetime

  • Type: datetime_t
  • Requirement: optional

The start time of a time period, or the time of the least recent event included in the aggregate event.

time_dt datetime

  • Type: datetime_t
  • Requirement: optional

The normalized event occurrence time or the finding creation time.

Primary

Section titled “Primary”

action_id security_control

  • Type: integer_t
  • Requirement: required
  • Values:
    • 0 - Unknown: The action was unknown. The disposition_id attribute may still be set to a non-unknown value, for example ‘Count’, ‘Uncorrected’, ‘Isolated’, ‘Quarantined’ or ‘Exonerated’.
    • 1 - Allowed: 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.
    • 2 - Denied: 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.
    • 99 - Other: The action was not mapped. See the action attribute, which contains a data source specific value.

The action taken by a control or other policy-based system leading to an outcome or disposition. Dispositions conform to an action of 1 ‘Allowed’ or 2 ‘Denied’ in most cases. Note that 99 ‘Other’ is not an option. No action would equate to 1 ‘Allowed’. An unknown action may still correspond to a known disposition. Refer to disposition_id for the outcome of the action.

cloud cloud

  • Type: cloud
  • Requirement: required

Describes details about the Cloud environment where the event was originally created or logged.

email

  • Type: email
  • Requirement: required

The email object.

device host

  • Type: device
  • Requirement: recommended

An addressable device, computer system or host.

disposition_id security_control

  • Type: integer_t
  • Requirement: recommended
  • Values:
    • 0 - Unknown: The disposition was not known.
    • 1 - Allowed: Granted access or allowed the action to the protected resource.
    • 2 - Blocked: Denied access or blocked the action to the protected resource.
    • 3 - Quarantined: A suspicious file or other content was moved to a benign location.
    • 4 - Isolated: A session was isolated on the network or within a browser.
    • 5 - Deleted: A file or other content was deleted.
    • 6 - Dropped: The request was detected as a threat and resulted in the connection being dropped.
    • 7 - Custom Action: A custom action was executed such as running of a command script. Use the message attribute of the base class for details.
    • 8 - Approved: A request or submission was approved. For example, when a form was properly filled out and submitted. This is distinct from 1 ‘Allowed’.
    • 9 - Restored: A quarantined file or other content was restored to its original location.
    • 10 - Exonerated: A suspicious or risky entity was deemed to no longer be suspicious (re-scored).
    • 11 - Corrected: A corrupt file or configuration was corrected.
    • 12 - Partially Corrected: A corrupt file or configuration was partially corrected.
    • 13 - Uncorrected: A corrupt file or configuration was not corrected.
    • 14 - Delayed: An operation was delayed, for example if a restart was required to finish the operation.
    • 15 - Detected: Suspicious activity or a policy violation was detected without further action.
    • 16 - No Action: The outcome of an operation had no action taken.
    • 17 - Logged: The operation or action was logged without further action.
    • 18 - Tagged: A file or other entity was marked with extended attributes.
    • 19 - Alert: The request or activity was detected as a threat and resulted in a notification but request was not blocked.
    • 20 - Count: Counted the request or activity but did not determine whether to allow it or block it.
    • 21 - Reset: The request was detected as a threat and resulted in the connection being reset.
    • 22 - Captcha: Required the end user to solve a CAPTCHA puzzle to prove that a human being is sending the request.
    • 23 - Challenge: Ran a silent challenge that required the client session to verify that it’s a browser, and not a bot.
    • 24 - Access 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.
    • 25 - Rejected: A request or submission was rejected. For example, when a form was improperly filled out and submitted. This is distinct from 2 ‘Blocked’.
    • 26 - Unauthorized: 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.
    • 27 - Error: An error occurred during the processing of the activity or request. Use the message attribute of the base class for details.
    • 99 - Other: The disposition is not listed. The disposition attribute should be populated with a source specific caption.

Describes the outcome or action taken by a security control, such as access control checks, malware detections or various types of policy violations.

email_auth

The SPF, DKIM and DMARC attributes of an email.

message

  • Type: string_t
  • Requirement: recommended

The description of the event/finding, as defined by the source.

smtp_hello

  • Type: string_t
  • Requirement: recommended

The value of the SMTP HELO or EHLO command sent by the initiator (client).

status_id

  • Type: integer_t
  • Requirement: recommended
  • Values:
    • 0 - Unknown: The status is unknown.
    • 1 - Success
    • 2 - Failure
    • 99 - Other: The event status is not mapped. See the status attribute, which contains a data source specific value.

The normalized identifier of the event status.

action security_control

  • Type: string_t
  • Requirement: optional

The normalized caption of action_id.

actor host

  • Type: actor
  • Requirement: optional

The actor object describes details about the user/role/process that was the source of the activity.

attacks security_control

  • Type: attack
  • Requirement: optional

An array of MITRE ATT&CK® objects describing the tactics, techniques & sub-techniques identified by a security control or finding.

authorizations security_control

Provides details about an authorization, such as authorization outcome, and any associated policies related to the activity/event.

disposition security_control

  • Type: string_t
  • Requirement: optional

The disposition name, normalized to the caption of the disposition_id value. In the case of ‘Other’, it is defined by the event source.

dst_endpoint

The responder (server) receiving the email.

firewall_rule security_control

The firewall rule that triggered the event.

malware security_control

  • Type: malware
  • Requirement: optional

A list of Malware objects, describing details about the identified malware.

observables

The observables associated with the event or a finding.

src_endpoint

The initiator (client) sending the email.

status

  • Type: string_t
  • Requirement: optional

The event status, normalized to the caption of the status_id value. In the case of ‘Other’, it is defined by the event source.

status_code

  • Type: string_t
  • Requirement: optional

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

  • Type: string_t
  • Requirement: optional

The status details contains additional information about the event/finding outcome.

Objects Used

Section titled “Objects Used”