Microsoft-Windows-WebServices

21 events across 1 channel

Event	Title	Channel	Sample
1	api API is called.	Tracing	N
2	api API returned.	Tracing	N
3	api API failed by result.	Tracing	N
4	api API is pending completion.	Tracing	N
5	api API completed.	Tracing	N
6	api API failed to complete by result.	Tracing	N
7	Error occurred: error - errorString.	Tracing	N
8	operation IO operation started.	Tracing	N
9	operation IO operation completed, size bytes transferred.	Tracing	N
10	operation IO operation failed: error.	Tracing	N
11	Sending message - bin (id: correlationId): message.	Tracing	N
12	Received message - bin (id: correlationId): message.	Tracing	N
13	Sending message (id: correlationId): message.	Tracing	N
14	Received message (id: correlationId): message.	Tracing	N
15	Sending Message Start (id: correlationId).	Tracing	N
16	Sending Message Stop (id: correlationId).	Tracing	N
17	Received Message Start (id: correlationId).	Tracing	N
18	Received Message Stop (id: correlationId).	Tracing	N
19	Sending following HTTP headers: length.	Tracing	N
20	Receiving following HTTP headers: length.	Tracing	N
21	Trace.	Tracing	N

Event ID 1: api API is called.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: APIs
Opcode: APIEnter

Description

api API is called.

Message #

%1 API is called.

Fields #

Name	Description
`api` UInt32

Event ID 2: api API returned.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: APIs
Opcode: APIExitSyncSuccess

Description

api API returned.

Message #

%1 API returned.

Fields #

Name	Description
`api` UInt32
`result` UInt32

Event ID 3: api API failed by result.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: APIs
Opcode: APIExitSyncFailure

Description

api API failed by result.

Message #

%1 API failed by %2

Fields #

Name	Description
`api` UInt32
`result` UInt32

Event ID 4: api API is pending completion.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: APIs
Opcode: APIPending

Description

api API is pending completion.

Message #

%1 API is pending completion.

Fields #

Name	Description
`api` UInt32

Event ID 5: api API completed.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: APIs
Opcode: APIExitAsyncSuccess

Description

api API completed.

Message #

%1 API completed.

Fields #

Name	Description
`api` UInt32
`result` UInt32

Event ID 6: api API failed to complete by result.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: APIs
Opcode: APIExitAsyncFailure

Description

api API failed to complete by result.

Message #

%1 API failed to complete by %2

Fields #

Name	Description
`api` UInt32
`result` UInt32

Event ID 7: Error occurred: error - errorString.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: Errors
Opcode: Error

Description

Error occurred: error - errorString.

Message #

Error occurred: %1 - %2

Fields #

Name	Description
`error` UInt32
`errorString` UnicodeString

Event ID 8: operation IO operation started.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: IOOperations
Opcode: IOStarted

Description

operation IO operation started.

Message #

%1 IO operation started.

Fields #

Name	Description
`operation` UInt32

Event ID 9: operation IO operation completed, size bytes transferred.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: IOOperations
Opcode: IOCompleted

Description

operation IO operation completed, size bytes transferred.

Message #

%1 IO operation completed, %2 bytes transferred.

Fields #

Name	Description
`operation` UInt32
`size` UInt32

Event ID 10: operation IO operation failed: error.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: IOOperations
Opcode: IOFailed

Description

operation IO operation failed: error.

Message #

%1 IO operation failed: %2

Fields #

Name	Description
`operation` UInt32
`error` UInt32

Event ID 11: Sending message - bin (id: correlationId): message.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: MessageExchange
Opcode: SendingMessage_Binary

Description

Sending message - bin (id: correlationId).

Message #

Sending message - bin  (id: %1): 
%3

Fields #

Name	Description
`correlationId` UInt64
`length` UInt16
`message` UnicodeString

Event ID 12: Received message - bin (id: correlationId): message.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: MessageExchange
Opcode: ReceivedMessage_Binary

Description

Received message - bin (id: correlationId).

Message #

Received message - bin (id: %1): 
%3

Fields #

Name	Description
`correlationId` UInt64
`length` UInt16
`message` UnicodeString

Event ID 13: Sending message (id: correlationId): message.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: MessageExchange
Opcode: SendingMessage_Text

Description

Sending message (id: correlationId).

Message #

Sending message        (id: %1): 
%3

Fields #

Name	Description
`correlationId` UInt64
`length` UInt16
`message` UnicodeString

Event ID 14: Received message (id: correlationId): message.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: MessageExchange
Opcode: ReceivedMessage_Text

Description

Received message (id: correlationId).

Message #

Received message       (id: %1): 
%3

Fields #

Name	Description
`correlationId` UInt64
`length` UInt16
`message` UnicodeString

Event ID 15: Sending Message Start (id: correlationId).

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: MessageExchange
Opcode: SendingMessageStart

Description

Sending Message Start (id: correlationId).

Message #

Sending Message Start  (id: %1)

Fields #

Name	Description
`correlationId` UInt64

Event ID 16: Sending Message Stop (id: correlationId).

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: MessageExchange
Opcode: SendingMessageStop

Description

Sending Message Stop (id: correlationId).

Message #

Sending Message Stop   (id: %1)

Fields #

Name	Description
`correlationId` UInt64

Event ID 17: Received Message Start (id: correlationId).

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: MessageExchange
Opcode: ReceivedMessageStart

Description

Received Message Start (id: correlationId).

Message #

Received Message Start (id: %1)

Fields #

Name	Description
`correlationId` UInt64

Event ID 18: Received Message Stop (id: correlationId).

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: MessageExchange
Opcode: ReceivedMessageStop

Description

Received Message Stop (id: correlationId).

Message #

Received Message Stop  (id: %1)

Fields #

Name	Description
`correlationId` UInt64

Event ID 19: Sending following HTTP headers: length.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: APIs
Opcode: SendingHTTPheaders

Description

Sending following HTTP headers: length.

Message #

Sending following HTTP headers: %1

Fields #

Name	Description
`length` UInt16
`traceString` UnicodeString

Event ID 20: Receiving following HTTP headers: length.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: APIs
Opcode: ReceivingHTTPheaders

Description

Receiving following HTTP headers: length.

Message #

Receiving following HTTP headers: %1

Fields #

Name	Description
`length` UInt16
`traceString` UnicodeString

Event ID 21: Trace.

Provider: Microsoft-Windows-WebServices
Channel: Tracing
Task: APIs
Opcode: Trace

Description

Trace: traceString

Message #

Trace: %1

Fields #

Name	Description
`traceString` UnicodeString

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 e04fe2e0-c6cf-4273-b59d-5c97c9c374a4

Defined in WebServices.dll, which carries the event manifest.

Observed on:

WS2022-20348.4893, schema read from the registered manifest, binary version 10.0.20348.1, captured 2026-06-02
Win11-26200.6584, schema read from the registered manifest, binary version 10.0.26100.1, captured 2026-06-02

`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)