Microsoft-Windows-Crypto-RNG

10 events across 1 channel

Event	Title	Channel	Sample
1	An entropy source was registered.	Analytic	N
2	Entropy source SourceNumber (SourceName) was unregistered.	Analytic	N
3	Entropy source SourceNumber provided BytesProvided bytes with EntropyEstimate …	Analytic	Y
4	Callback to source SourceNumber returned status ResultStatus, taking time …	Analytic	N
16	Boot entropy result.	Analytic	N
32	Pool reseed: Count PoolReseedCount Type ReseedType Data Data.	Analytic	N
33	Pool add: Pool PoolNo Data Data.	Analytic	N
48	Prng (re)seed: Addr PrngAddress Data Data.	Analytic	N
49	Prng output: Addr PrngAddress Bytes BytesProduced Data Data.	Analytic	N
50	New process created.	Analytic	N

Event ID 1: An entropy source was registered.

Provider: Microsoft-Windows-Crypto-RNG
Channel: Analytic
Task: Gatherentropyforthesystemrandomnumbergenerator
Opcode: Start

Description

An entropy source was registered.

Message #

An entropy source was registered.
	Source	%1
	Name	%2
	Type	%3

Fields #

Name	Description
`SourceNumber` UInt64
`SourceName` UnicodeString
`SourceType` UInt32

Event ID 2: Entropy source SourceNumber (SourceName) was unregistered.

Provider: Microsoft-Windows-Crypto-RNG
Channel: Analytic
Task: Gatherentropyforthesystemrandomnumbergenerator
Opcode: Stop

Description

Entropy source SourceNumber (SourceName) was unregistered.

Message #

Entropy source %1 (%2) was unregistered.

Fields #

Name	Description
`SourceNumber` UInt64
`SourceName` UnicodeString

Event ID 3: Entropy source SourceNumber provided BytesProvided bytes with EntropyEstimate millibits of entropy.

Provider: Microsoft-Windows-Crypto-RNG
Channel: Analytic
Also via: realtime ETW trace
Level: Informational
Task: Gatherentropyforthesystemrandomnumbergenerator
Opcode: win:Info

Description

Entropy source SourceNumber provided BytesProvided bytes with EntropyEstimate millibits of entropy.

Message #

Entropy source %1 provided %2 bytes with %3 millibits of entropy
Data	%5

Fields #

Name	Description
`SourceNumber` UInt64
`BytesProvided` UInt32
`EntropyEstimate` Int32
`nData` UInt32
`Data` Binary
`Counter` HexInt64

Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-Crypto-RNG",
    "guid": "{54D5AC20-E14F-4FDA-92DA-EBF7556FF176}",
    "event_source_name": "",
    "event_id": 3,
    "version": 0,
    "level": 4,
    "task": 10,
    "opcode": 0,
    "keywords": "0x0000000000000002",
    "time_created": "2026-06-02T05:15:06.131+00:00",
    "event_record_id": 0,
    "correlation": {},
    "execution": {
      "process_id": 0,
      "thread_id": 0
    },
    "channel": "ETW Trace",
    "computer": "JD-DC01-2022",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "BytesProvided": 128,
    "Counter": "82B2000000000000",
    "Data": "",
    "EntropyEstimate": 128000,
    "SourceNumber": 3,
    "nData": 0
  },
  "message": "GatherEntropy"
}

Event ID 4: Callback to source SourceNumber returned status ResultStatus, taking time TimeTaken.

Provider: Microsoft-Windows-Crypto-RNG
Channel: Analytic
Task: Gatherentropyforthesystemrandomnumbergenerator

Description

Callback to source SourceNumber returned status ResultStatus, taking time TimeTaken.

Message #

Callback to source %1 returned status %2, taking time %3

Fields #

Name	Description
`SourceNumber` UInt64
`ResultStatus` HexInt32
`TimeTaken` UInt64

Event ID 16: Boot entropy result.

Provider: Microsoft-Windows-Crypto-RNG
Channel: Analytic
Task: Gatherentropyforthesystemrandomnumbergenerator

Description

Boot entropy result.

Message #

Boot entropy result:
	Source	%1
	Policy	%2
	Code	%3
	Status	%4
	Time	%5
	BytesProvided	%6
	Bytes	%8

Fields #

Name	Description
`Source` UInt32
`Policy` UInt32
`ResultCode` UInt32
`ResultStatus` HexInt32
`Time` UInt64
`BytesProvided` UInt32
`nData` UInt32
`Data` Binary

Event ID 32: Pool reseed: Count PoolReseedCount Type ReseedType Data Data.

Provider: Microsoft-Windows-Crypto-RNG
Channel: Analytic
Task: Gatherentropyforthesystemrandomnumbergenerator

Description

Pool reseed.

Message #

Pool reseed:
	Count	%1
	Type	%2
	Data	%4

Fields #

Name	Description
`PoolReseedCount` UInt64
`ReseedType` UInt32
`nData` UInt32
`Data` Binary
`Counter` HexInt64

Event ID 33: Pool add: Pool PoolNo Data Data.

Provider: Microsoft-Windows-Crypto-RNG
Channel: Analytic
Task: Gatherentropyforthesystemrandomnumbergenerator

Description

Pool add: Pool PoolNo Data Data

Message #

Pool add:
	Pool	%1
	Data	%3

Fields #

Name	Description
`PoolNo` UInt32
`nData` UInt32
`Data` Binary
`Counter` HexInt64

Event ID 48: Prng (re)seed: Addr PrngAddress Data Data.

Provider: Microsoft-Windows-Crypto-RNG
Channel: Analytic
Task: Prng

Description

Prng (re)seed.

Message #

Prng (re)seed:
Addr	%1
Data	%3

Fields #

Name	Description
`PrngAddress` HexInt64
`nData` UInt32
`Data` Binary
`UserMode` Boolean
`Counter` HexInt64

Event ID 49: Prng output: Addr PrngAddress Bytes BytesProduced Data Data.

Provider: Microsoft-Windows-Crypto-RNG
Channel: Analytic
Task: Prng

Description

Prng output.

Message #

Prng output:
	Addr	%1
	Bytes	%2
	Data	%4

Fields #

Name	Description
`PrngAddress` HexInt64
`BytesProduced` UInt64
`nData` UInt32
`Data` Binary
`UserMode` Boolean
`Counter` HexInt64

Event ID 50: New process created.

Provider: Microsoft-Windows-Crypto-RNG
Channel: Analytic
Task: Prng

Description

New process created. Old Prng states under this proces ID are no longer valid.

Message #

New process created. Old Prng states under this proces ID are no longer valid

Fields #

Name	Description
`UserMode` Boolean

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 {54D5AC20-E14F-4FDA-92DA-EBF7556FF176}

Defined in cng.sys, the binary that emits these events.

Observed on:

WS2022-20348.4893, sample captured from a live trace, binary version 10.0.20348.4648, captured 2026-06-02
WS2022-20348.4893, schema read from the registered manifest, binary version 10.0.20348.4648, captured 2026-06-02
Win11-26200.6584, schema read from the registered manifest, binary version 10.0.26100.5074, 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-Crypto-RNG

Event ID 1: An entropy source was registered.

Description

Message #

Fields #

Event ID 2: Entropy source SourceNumber (SourceName) was unregistered.

Description

Message #

Fields #

Event ID 3: Entropy source SourceNumber provided BytesProvided bytes with EntropyEstimate millibits of entropy.

Description

Message #

Fields #

Example Event #

Event ID 4: Callback to source SourceNumber returned status ResultStatus, taking time TimeTaken.

Description

Message #

Fields #

Event ID 16: Boot entropy result.

Description

Message #

Fields #

Event ID 32: Pool reseed: Count PoolReseedCount Type ReseedType Data Data.

Description

Message #

Fields #

Event ID 33: Pool add: Pool PoolNo Data Data.

Description

Message #

Fields #

Event ID 48: Prng (re)seed: Addr PrngAddress Data Data.

Description

Message #

Fields #

Event ID 49: Prng output: Addr PrngAddress Bytes BytesProduced Data Data.

Description

Message #

Fields #

Event ID 50: New process created.

Description

Message #

Fields #

Provenance

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