Microsoft-Windows-Schannel-Events

24 events across 1 channel

Event	Title	Channel	Sample
257	AcquireCredentialHandle	Perf	Y
258	AcquireCredentialHandle	Perf	Y
513	AcceptSecurityContextStart	Perf	N
514	AcceptSecurityContextStop	Perf	N
769	MemoryAllocationAllocate	Perf	N
770	MemoryAllocationFree	Perf	N
1025	CAPI2CallsStart	Perf	N
1026	CAPI2CallsStop	Perf	N
1027	CAPI2CallsStart1027	Perf	N
1028	CAPI2CallsStop1028	Perf	N
1029	CAPI2CallsStart1029	Perf	N
1030	CAPI2CallsStop1030	Perf	N
1031	CAPI2CallsStart1031	Perf	N
1032	CAPI2CallsStop1032	Perf	N
1033	CAPI2CallsStart1033	Perf	N
1034	CAPI2CallsStop1034	Perf	N
1281	PKCryptoStart	Perf	N
1282	PKCryptoStop	Perf	N
1283	PKCrypto	Perf	Y
1284	PKCrypto	Perf	Y
1537	FreeCredentialHandle	Perf	Y
1538	FreeCredentialHandle	Perf	Y
1793	A TLS Security Context handle is being deleted.	Perf	Y
1794	DeleteSecurityContext	Perf	Y

Event ID 257: AcquireCredentialHandle

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Level: Informational
Task: AcquireCredentialHandle
Opcode: Start

Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-Schannel-Events",
    "guid": "{91CC1150-71AA-47E2-AE18-C96E61736B6F}",
    "event_source_name": "",
    "event_id": 257,
    "version": 0,
    "level": 4,
    "task": 4096,
    "opcode": 1,
    "keywords": "0x0000000000000000",
    "time_created": "2026-06-02T06:02:18.456+00:00",
    "event_record_id": 0,
    "correlation": {
      "ActivityID": "{72529F65-EE0F-0002-E99F-52720FEEDC01}"
    },
    "execution": {
      "process_id": 944,
      "thread_id": 14076
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {},
  "message": "AcquireCredentialHandle"
}

Event ID 258: AcquireCredentialHandle

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Also via: realtime ETW trace
Level: Informational
Task: AcquireCredentialHandle
Opcode: Stop

Fields #

Name	Description
`ReturnValue` HexInt32

Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-Schannel-Events",
    "guid": "{91CC1150-71AA-47E2-AE18-C96E61736B6F}",
    "event_source_name": "",
    "event_id": 258,
    "version": 0,
    "level": 4,
    "task": 4096,
    "opcode": 2,
    "keywords": "0x0000000000000000",
    "time_created": "2026-06-02T06:02:18.456+00:00",
    "event_record_id": 0,
    "correlation": {
      "ActivityID": "{72529F65-EE0F-0002-E99F-52720FEEDC01}"
    },
    "execution": {
      "process_id": 944,
      "thread_id": 14076
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "ReturnValue": "00000000"
  },
  "message": "AcquireCredentialHandle"
}

Event ID 513: AcceptSecurityContextStart

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: AcceptSecurityContext
Opcode: Start

Fields #

Name	Description
`CredHandle` Pointer
`ContextHandle` Pointer

Event ID 514: AcceptSecurityContextStop

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: AcceptSecurityContext
Opcode: Stop

Fields #

Name	Description
`ContextHandle` Pointer
`ReturnValue` HexInt32

Event ID 769: MemoryAllocationAllocate

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: MemoryAllocation
Opcode: Allocate

Fields #

Name	Description
`Address` Pointer
`AllocationSize` HexInt32

Event ID 770: MemoryAllocationFree

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: MemoryAllocation
Opcode: Free

Fields #

Name	Description
`Address` Pointer

Event ID 1025: CAPI2CallsStart

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: CAPI2Calls
Opcode: Start

Event ID 1026: CAPI2CallsStop

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: CAPI2Calls
Opcode: Stop

Event ID 1027: CAPI2CallsStart1027

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: CAPI2Calls
Opcode: Start

Event ID 1028: CAPI2CallsStop1028

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: CAPI2Calls
Opcode: Stop

Event ID 1029: CAPI2CallsStart1029

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: CAPI2Calls
Opcode: Start

Event ID 1030: CAPI2CallsStop1030

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: CAPI2Calls
Opcode: Stop

Event ID 1031: CAPI2CallsStart1031

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: CAPI2Calls
Opcode: Start

Event ID 1032: CAPI2CallsStop1032

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: CAPI2Calls
Opcode: Stop

Event ID 1033: CAPI2CallsStart1033

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: CAPI2Calls
Opcode: Start

Event ID 1034: CAPI2CallsStop1034

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: CAPI2Calls
Opcode: Stop

Event ID 1281: PKCryptoStart

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: PKCrypto
Opcode: Start

Event ID 1282: PKCryptoStop

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Task: PKCrypto
Opcode: Stop

Event ID 1283: PKCrypto

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Level: Informational
Task: PKCrypto
Opcode: Start

Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-Schannel-Events",
    "guid": "{91CC1150-71AA-47E2-AE18-C96E61736B6F}",
    "event_source_name": "",
    "event_id": 1283,
    "version": 0,
    "level": 4,
    "task": 20480,
    "opcode": 1,
    "keywords": "0x0000000000000000",
    "time_created": "2026-06-02T06:02:18.542+00:00",
    "event_record_id": 0,
    "correlation": {
      "ActivityID": "{72529F65-EE0F-0002-E99F-52720FEEDC01}"
    },
    "execution": {
      "process_id": 944,
      "thread_id": 14076
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {},
  "message": "PKCrypto"
}

Event ID 1284: PKCrypto

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Level: Informational
Task: PKCrypto
Opcode: Stop

Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-Schannel-Events",
    "guid": "{91CC1150-71AA-47E2-AE18-C96E61736B6F}",
    "event_source_name": "",
    "event_id": 1284,
    "version": 0,
    "level": 4,
    "task": 20480,
    "opcode": 2,
    "keywords": "0x0000000000000000",
    "time_created": "2026-06-02T06:02:18.542+00:00",
    "event_record_id": 0,
    "correlation": {
      "ActivityID": "{72529F65-EE0F-0002-E99F-52720FEEDC01}"
    },
    "execution": {
      "process_id": 944,
      "thread_id": 14076
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {},
  "message": "PKCrypto"
}

Event ID 1537: FreeCredentialHandle

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Also via: realtime ETW trace
Level: Informational
Task: FreeCredentialHandle
Opcode: Start

Fields #

Name	Description
`CredHandle` Pointer

Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-Schannel-Events",
    "guid": "{91CC1150-71AA-47E2-AE18-C96E61736B6F}",
    "event_source_name": "",
    "event_id": 1537,
    "version": 0,
    "level": 4,
    "task": 24576,
    "opcode": 1,
    "keywords": "0x0000000000000000",
    "time_created": "2026-06-02T06:02:18.898+00:00",
    "event_record_id": 0,
    "correlation": {
      "ActivityID": "{72529F65-EE0F-0002-E99F-52720FEEDC01}"
    },
    "execution": {
      "process_id": 944,
      "thread_id": 14076
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "CredHandle": "0x21546C08A40"
  },
  "message": "FreeCredentialHandle"
}

Event ID 1538: FreeCredentialHandle

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Level: Informational
Task: FreeCredentialHandle
Opcode: Stop

Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-Schannel-Events",
    "guid": "{91CC1150-71AA-47E2-AE18-C96E61736B6F}",
    "event_source_name": "",
    "event_id": 1538,
    "version": 0,
    "level": 4,
    "task": 24576,
    "opcode": 2,
    "keywords": "0x0000000000000000",
    "time_created": "2026-06-02T06:02:18.898+00:00",
    "event_record_id": 0,
    "correlation": {
      "ActivityID": "{72529F65-EE0F-0002-E99F-52720FEEDC01}"
    },
    "execution": {
      "process_id": 944,
      "thread_id": 14076
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {},
  "message": "FreeCredentialHandle"
}

Event ID 1793: A TLS Security Context handle is being deleted.

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Also via: realtime ETW trace
Level: Informational
Task: DeleteSecurityContext
Opcode: Start

Description

A TLS Security Context handle is being deleted.

Message #

A TLS Security Context handle is being deleted.

   Context handle: %1
   Target name: %2

Fields #

Name	Description
`ContextHandle` Pointer
`TargetName` UnicodeString

Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-Schannel-Events",
    "guid": "{91CC1150-71AA-47E2-AE18-C96E61736B6F}",
    "event_source_name": "",
    "event_id": 1793,
    "version": 0,
    "level": 4,
    "task": 28672,
    "opcode": 1,
    "keywords": "0x0000000000000000",
    "time_created": "2026-06-02T06:02:18.897+00:00",
    "event_record_id": 0,
    "correlation": {
      "ActivityID": "{72529F65-EE0F-0002-E99F-52720FEEDC01}"
    },
    "execution": {
      "process_id": 944,
      "thread_id": 14076
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "ContextHandle": "0x21546DBA4D0",
    "TargetName": "watson.events.data.microsoft.com"
  },
  "message": "DeleteSecurityContext"
}

Event ID 1794: DeleteSecurityContext

Provider: Microsoft-Windows-Schannel-Events
Channel: Perf
Level: Informational
Task: DeleteSecurityContext
Opcode: Stop

Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-Schannel-Events",
    "guid": "{91CC1150-71AA-47E2-AE18-C96E61736B6F}",
    "event_source_name": "",
    "event_id": 1794,
    "version": 0,
    "level": 4,
    "task": 28672,
    "opcode": 2,
    "keywords": "0x0000000000000000",
    "time_created": "2026-06-02T06:02:18.897+00:00",
    "event_record_id": 0,
    "correlation": {
      "ActivityID": "{72529F65-EE0F-0002-E99F-52720FEEDC01}"
    },
    "execution": {
      "process_id": 944,
      "thread_id": 14076
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {},
  "message": "DeleteSecurityContext"
}

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 {91CC1150-71AA-47E2-AE18-C96E61736B6F}

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

Observed on:

Win11-26200.6584, sample captured from a live trace, binary version 10.0.26100.1, captured 2026-06-02
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)

Microsoft-Windows-Schannel-Events

Event ID 257: AcquireCredentialHandle

Example Event #

Event ID 258: AcquireCredentialHandle

Fields #

Example Event #

Event ID 513: AcceptSecurityContextStart

Fields #

Event ID 514: AcceptSecurityContextStop

Fields #

Event ID 769: MemoryAllocationAllocate

Fields #

Event ID 770: MemoryAllocationFree

Fields #

Event ID 1025: CAPI2CallsStart

Event ID 1026: CAPI2CallsStop

Event ID 1027: CAPI2CallsStart1027

Event ID 1028: CAPI2CallsStop1028

Event ID 1029: CAPI2CallsStart1029

Event ID 1030: CAPI2CallsStop1030

Event ID 1031: CAPI2CallsStart1031

Event ID 1032: CAPI2CallsStop1032

Event ID 1033: CAPI2CallsStart1033

Event ID 1034: CAPI2CallsStop1034

Event ID 1281: PKCryptoStart

Event ID 1282: PKCryptoStop

Event ID 1283: PKCrypto

Example Event #

Event ID 1284: PKCrypto

Example Event #

Event ID 1537: FreeCredentialHandle

Fields #

Example Event #

Event ID 1538: FreeCredentialHandle

Example Event #

Event ID 1793: A TLS Security Context handle is being deleted.

Description

Message #

Fields #

Example Event #

Event ID 1794: DeleteSecurityContext

Example Event #

Provenance

Downloads