Exchange Online Protection hygiene events M365-HygieneEvent

2 operations, identified by Operation in the audit log.

Operation	Description
_catch_all	Catch-all for M365-HygieneEvent rules matching the RecordType but no specific Operation.
User restricted from sending email	Exchange Online Protection restricted a mailbox from sending email after detecting high-volume or spammy outbound activity, typically indicating account compromise.

_catch_all: Exchange Online Protection hygiene events (catch-all)

RecordType: M365-HygieneEvent

Description

Catch-all for M365-HygieneEvent rules matching the RecordType but no specific Operation.

Fields #

Name	Description
`RecordType`	AuditLogRecordType enum value (named string in Sentinel OfficeActivity; integer in the raw Management Activity API JSON).
`Operation`	The name of the user or admin activity. For Exchange admin activity this is the cmdlet name; for DLP it is DlpRuleMatch/DlpRuleUndo/DlpInfo. The per-event discriminator (event.action in Elastic ECS).
`Workload`	The Microsoft 365 service where the activity occurred (Exchange, SharePoint, AzureActiveDirectory, MicrosoftTeams, ...). Surfaces as event.provider in Elastic ECS.
`ResultStatus`	Whether the action succeeded: Succeeded, PartiallySucceeded, or Failed (True/False for Exchange admin). For STS-logon events this reflects only the HTTP operation, not logon success: check LogonError.
`UserId`	UPN of the user who performed the action; system-account and app@sharepoint values also appear.
`UserType`	Type of actor: Regular, Admin, System, DcAdmin, Application, ServicePrincipal.
`UserKey`	Alternative ID for the user (the PUID for SharePoint / OneDrive / Exchange events).
`ClientIP`	IPv4/IPv6 address of the device used; may be a trusted-app IP, and is null for Microsoft Entra ID events.
`ObjectId`	For SharePoint/OneDrive, the full path of the file/folder; for Exchange admin, the object modified by the cmdlet; shape is operation-specific.
`OrganizationId`	GUID of the tenant's Office 365 organization (constant per tenant).
`Id`	Unique identifier (GUID) for the audit record.
`CreationTime`	UTC date/time when the audit record was generated.
`Scope`	Source of the event: online (a Microsoft 365 service) or onprem (an on-premises service; currently SharePoint only).
`AppAccessContext`	Application context for the user or service principal that performed the action.

Detection Rules #

View all rules referencing this event →

Elastic #

M365 Quarantine and Hygiene Signal source low: Identifies Microsoft 365 email quarantine, hygiene, and mail submission events. These signals indicate blocked threats, spam filtering actions, and user-reported suspicious emails. While these represent blocked or mitigated threats, they provide valuable telemetry for understanding attempted attacks and attack patterns. This building block rule generates security events for correlation, threat hunting, and telemetry collection.

References #

Office 365 Management Activity API schema (AuditLogRecordType enum) https://learn.microsoft.com/en-us/office/office-365-management-api/office-365-management-activity-api-schema
Microsoft Purview audit log activities reference https://learn.microsoft.com/en-us/purview/audit-log-activities

User restricted from sending email

RecordType: M365-HygieneEvent

Description

Exchange Online Protection restricted a mailbox from sending email after detecting high-volume or spammy outbound activity, typically indicating account compromise.

Fields #

Name	Description
`RecordType`	AuditLogRecordType enum value (named string in Sentinel OfficeActivity; integer in the raw Management Activity API JSON).
`Operation`	The name of the user or admin activity. For Exchange admin activity this is the cmdlet name; for DLP it is DlpRuleMatch/DlpRuleUndo/DlpInfo. The per-event discriminator (event.action in Elastic ECS).
`Workload`	The Microsoft 365 service where the activity occurred (Exchange, SharePoint, AzureActiveDirectory, MicrosoftTeams, ...). Surfaces as event.provider in Elastic ECS.
`ResultStatus`	Whether the action succeeded: Succeeded, PartiallySucceeded, or Failed (True/False for Exchange admin). For STS-logon events this reflects only the HTTP operation, not logon success: check LogonError.
`UserId`	UPN of the user who performed the action; system-account and app@sharepoint values also appear.
`UserType`	Type of actor: Regular, Admin, System, DcAdmin, Application, ServicePrincipal.
`UserKey`	Alternative ID for the user (the PUID for SharePoint / OneDrive / Exchange events).
`ClientIP`	IPv4/IPv6 address of the device used; may be a trusted-app IP, and is null for Microsoft Entra ID events.
`ObjectId`	For SharePoint/OneDrive, the full path of the file/folder; for Exchange admin, the object modified by the cmdlet; shape is operation-specific.
`OrganizationId`	GUID of the tenant's Office 365 organization (constant per tenant).
`Id`	Unique identifier (GUID) for the audit record.
`CreationTime`	UTC date/time when the audit record was generated.
`Scope`	Source of the event: online (a Microsoft 365 service) or onprem (an on-premises service; currently SharePoint only).
`AppAccessContext`	Application context for the user or service principal that performed the action.

Common Indicators #

Field/value combinations most frequently checked by detection rules targeting this event, derived from cross-vendor predicate analysis.

Field	Kind	Value	Rules	Vendors
`Provider_Name`	eq	`SecurityComplianceCenter`	1 rule	elastic

Detection Rules #

View all rules referencing this event →

Elastic #

Deprecated - M365 Security Compliance User Restricted from Sending Email source medium: Identifies when a user has been restricted from sending email due to exceeding sending limits of the service policies per the Security Compliance Center.

References #

Office 365 Management Activity API schema (AuditLogRecordType enum) https://learn.microsoft.com/en-us/office/office-365-management-api/office-365-management-activity-api-schema
Microsoft Purview audit log activities reference https://learn.microsoft.com/en-us/purview/audit-log-activities

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`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)

Exchange Online Protection hygiene events M365-HygieneEvent

_catch_all: Exchange Online Protection hygiene events (catch-all)

Description

Fields #

Detection Rules #

Elastic #

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User restricted from sending email

Description

Fields #

Common Indicators #

Detection Rules #

Elastic #

References #

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