Microsoft-Windows-MosHost

28 events across 2 channels

Event	Title	Channel	Sample
1	String1.	Operational	N
2	String1 String2.	Operational	N
3	Message Error: ErrorCode.	Operational	N
10	Framework State: Framework_State, HRESULT: HRESULT.	Operational	N
20	MosHost ServiceStart	Operational	N
21	MosHost ServiceStop	Operational	N
30	MosHost IncrementClientCount	Operational	N
31	MosHost DecrementClientCount	Operational	N
50	MosHost ExecCommand	Operational	N
70	MosHost GetDataDirectory	Operational	N
80	MosHost GetResourceDirectory	Operational	N
90	MosHost GetBrowseCacheSizeInMBytes	Operational	N
100	MosHost RegisterClient	Operational	N
101	MosHost RegisterClient PID: MosHost_RegisterClient_PID Type: Type.	Operational	N
110	MosHost DeregisterClient	Operational	N
111	MosHost DeregisterClient PID: MosHost_DeregisterClient_PID Type: Type.	Operational	N
120	MosHost GetActiveClients	Operational	N
121	MosHost GetActiveClients Total: MosHost_GetActiveClients_Total Unique: Unique.	Operational	N
130	MosHost GetReadSharingToken	Operational	N
131	MosHost GetReadSharingToken Info Path: MosHost_GetReadSharingToken_Info_Path …	Operational	N
150	MosHost150	Operational	N
151	MosHost151	Operational	N
152	MosHost ConnectivityCallback Online: MosHost_ConnectivityCallback_Online.	Operational	N
153	MosHost SetMosOnline Online: MosHost_SetMosOnline_Online.	Operational	N
1000	Odml IncrementOdmlClientCount	Operational	N
1001	Odml DecrementOdmlClientCount	Operational	N
1010	Odml StartInstallation Start	Performance	N
1011	Odml StartInstallation Stop	Performance	N

Event ID 1: String1.

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

String1

Message #

%1

Fields #

Name	Description
`String1` UnicodeString

Event ID 2: String1 String2.

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

String1 String2

Message #

%1 %2

Fields #

Name	Description
`String1` UnicodeString
`String2` UnicodeString

Event ID 3: Message Error: ErrorCode.

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

Message Error: ErrorCode

Message #

%1 Error: %2

Fields #

Name	Description
`Message` UnicodeString
`ErrorCode` UInt32

Event ID 10: Framework State: Framework_State, HRESULT: HRESULT.

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

Framework State: Framework_State, HRESULT: HRESULT.

Message #

Framework State: %2, HRESULT: %1

Fields #

Name	Description
`HRESULT` UInt32
`State` UInt32

Event ID 20: MosHost ServiceStart

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost ServiceStart.

Message #

MosHost ServiceStart

Event ID 21: MosHost ServiceStop

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost ServiceStop.

Message #

MosHost ServiceStop

Event ID 30: MosHost IncrementClientCount

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost IncrementClientCount.

Message #

MosHost IncrementClientCount

Event ID 31: MosHost DecrementClientCount

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost DecrementClientCount.

Message #

MosHost DecrementClientCount

Event ID 50: MosHost ExecCommand

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost ExecCommand.

Message #

MosHost ExecCommand

Event ID 70: MosHost GetDataDirectory

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost GetDataDirectory.

Message #

MosHost GetDataDirectory

Event ID 80: MosHost GetResourceDirectory

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost GetResourceDirectory.

Message #

MosHost GetResourceDirectory

Event ID 90: MosHost GetBrowseCacheSizeInMBytes

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost GetBrowseCacheSizeInMBytes.

Message #

MosHost GetBrowseCacheSizeInMBytes

Event ID 100: MosHost RegisterClient

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost RegisterClient.

Message #

MosHost RegisterClient

Event ID 101: MosHost RegisterClient PID: MosHost_RegisterClient_PID Type: Type.

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost RegisterClient PID: MosHost_RegisterClient_PID Type: Type.

Message #

MosHost RegisterClient PID: %1 Type: %2

Fields #

Name	Description
`Dword1` UInt32
`Dword2` UInt32

Event ID 110: MosHost DeregisterClient

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost DeregisterClient.

Message #

MosHost DeregisterClient

Event ID 111: MosHost DeregisterClient PID: MosHost_DeregisterClient_PID Type: Type.

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost DeregisterClient PID: MosHost_DeregisterClient_PID Type: Type.

Message #

MosHost DeregisterClient PID: %1 Type: %2

Fields #

Name	Description
`Dword1` UInt32
`Dword2` UInt32

Event ID 120: MosHost GetActiveClients

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost GetActiveClients.

Message #

MosHost GetActiveClients

Event ID 121: MosHost GetActiveClients Total: MosHost_GetActiveClients_Total Unique: Unique.

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost GetActiveClients Total: MosHost_GetActiveClients_Total Unique: Unique.

Message #

MosHost GetActiveClients Total: %1 Unique: %2

Fields #

Name	Description
`Dword1` UInt32
`Dword2` UInt32

Event ID 130: MosHost GetReadSharingToken

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost GetReadSharingToken.

Message #

MosHost GetReadSharingToken

Event ID 131: MosHost GetReadSharingToken Info Path: MosHost_GetReadSharingToken_Info_Path Token: Token.

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost GetReadSharingToken Info Path: MosHost_GetReadSharingToken_Info_Path Token: Token.

Message #

MosHost GetReadSharingToken Info Path: %1 Token: %2

Fields #

Name	Description
`String1` UnicodeString
`String2` UnicodeString

Event ID 150: MosHost150

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Event ID 151: MosHost151

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Event ID 152: MosHost ConnectivityCallback Online: MosHost_ConnectivityCallback_Online.

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost ConnectivityCallback Online: MosHost_ConnectivityCallback_Online.

Message #

MosHost ConnectivityCallback Online: %1

Fields #

Name	Description
`Dword1` UInt32

Event ID 153: MosHost SetMosOnline Online: MosHost_SetMosOnline_Online.

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: MosHost

Description

MosHost SetMosOnline Online: MosHost_SetMosOnline_Online.

Message #

MosHost SetMosOnline Online: %1

Fields #

Name	Description
`Dword1` UInt32

Event ID 1000: Odml IncrementOdmlClientCount

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: Odml

Description

Odml IncrementOdmlClientCount.

Message #

Odml IncrementOdmlClientCount

Event ID 1001: Odml DecrementOdmlClientCount

Provider: Microsoft-Windows-MosHost
Channel: Operational
Task: Odml

Description

Odml DecrementOdmlClientCount.

Message #

Odml DecrementOdmlClientCount

Event ID 1010: Odml StartInstallation Start

Provider: Microsoft-Windows-MosHost
Channel: Performance
Task: Odml
Opcode: Start

Description

Odml StartInstallation Start.

Message #

Odml StartInstallation Start

Event ID 1011: Odml StartInstallation Stop

Provider: Microsoft-Windows-MosHost
Channel: Performance
Task: Odml
Opcode: Stop

Description

Odml StartInstallation Stop.

Message #

Odml StartInstallation Stop

Provenance

Where this provider's schema came from, and which Windows build it was observed on. Windows can change a provider's event schema between builds, so use this to judge whether it matches the build you collect from.

ETW provider GUID d116f0f2-a6d6-4f1f-bdda-0c88c8d1f2e9

Defined in Microsoft-Windows-MosHost.dll, which carries the event manifest.

Observed on:

Win11-26200.6584, schema read from the registered manifest, binary version 10.0.26100.1882, captured 2026-06-02

Downloads

Microsoft-Windows-MosHost registered manifest XML (in the Win11-26200.6584 manifest pack, 2.0 MB) manifest-xml

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`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)