Microsoft-Windows-CoreSystem-InitMachineConfig

6 events across 1 channel

Event	Title	Channel	Sample
1	An error with reference Id=evtErrorId was encountered while processing the hive …	System	N
2	Initial Machine Configuration processing of hive 'evtHiveName' has completed.	System	N
3	Initial Machine Configuration was unable to unload the IMC hive once processing …	System	N
4	Initial Machine Configuration was unable to update the system BCD to prevent …	System	N
5	Value blocked: evtValueNameLength under the key, evtKeyPathLength, was NOT set …	System	N
6	Value set: evtValueNameLength under the key, evtKeyPathLength, was set after …	System	N

Event ID 1: An error with reference Id=evtErrorId was encountered while processing the hive 'evtHiveName'.

Provider: Microsoft-Windows-CoreSystem-InitMachineConfig
Channel: System

Description

An error with reference Id=evtErrorId was encountered while processing the hive 'evtHiveName'. The status was: evtStatus. The additional information was evtAdditionalInfo.

Message #

An error with reference Id=%1 was encountered while processing the hive '%3'. The status was: %4.  The additional information was %5.

Fields #

Name	Description
`evtErrorId` UInt64
`evtHiveNameLength` UInt16
`evtHiveName` UnicodeString
`evtStatus` HexInt32
`evtAdditionalInfo` HexInt64

Event ID 2: Initial Machine Configuration processing of hive 'evtHiveName' has completed.

Provider: Microsoft-Windows-CoreSystem-InitMachineConfig
Channel: System

Description

Initial Machine Configuration processing of hive 'evtHiveName' has completed.

Message #

Initial Machine Configuration processing of hive '%2' has completed.

Fields #

Name	Description
`evtHiveNameLength` UInt16
`evtHiveName` UnicodeString

Event ID 3: Initial Machine Configuration was unable to unload the IMC hive once processing was completed.

Provider: Microsoft-Windows-CoreSystem-InitMachineConfig
Channel: System

Description

Initial Machine Configuration was unable to unload the IMC hive once processing was completed. The status was evtStatus.

Message #

Initial Machine Configuration was unable to unload the IMC hive once processing was completed.  The status was %1.

Fields #

Name	Description
`evtStatus` HexInt32

Event ID 4: Initial Machine Configuration was unable to update the system BCD to prevent future execution.

Provider: Microsoft-Windows-CoreSystem-InitMachineConfig
Channel: System

Description

Initial Machine Configuration was unable to update the system BCD to prevent future execution. The status was evtStatus.

Message #

Initial Machine Configuration was unable to update the system BCD to prevent future execution.  The status was %1.

Fields #

Name	Description
`evtStatus` HexInt32

Event ID 5: Value blocked: evtValueNameLength under the key, evtKeyPathLength, was NOT set after failing validation.

Provider: Microsoft-Windows-CoreSystem-InitMachineConfig
Channel: System

Description

Value blocked: evtValueNameLength under the key, evtKeyPathLength, was NOT set after failing validation.

Message #

Value blocked: %4 under the key, %2, was NOT set after failing validation.

Fields #

Name	Description
`evtKeyPathLength` UInt16
`evtKeyPath` UnicodeString
`evtValueNameLength` UInt16
`evtValueName` UnicodeString

Event ID 6: Value set: evtValueNameLength under the key, evtKeyPathLength, was set after passing validation.

Provider: Microsoft-Windows-CoreSystem-InitMachineConfig
Channel: System

Description

Value set: evtValueNameLength under the key, evtKeyPathLength, was set after passing validation.

Message #

Value set: %4 under the key, %2, was set after passing validation.

Fields #

Name	Description
`evtKeyPathLength` UInt16
`evtKeyPath` UnicodeString
`evtValueNameLength` UInt16
`evtValueName` 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 0b886108-1899-4d3a-9c0d-42d8fc4b9108

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

Observed on:

WS2022-20348.4893, schema read from the registered manifest, binary version 10.0.20348.3089, captured 2026-06-02
Win11-26200.6584, schema read from the registered manifest, binary version 10.0.26100.3323, captured 2026-06-02

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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)

Microsoft-Windows-CoreSystem-InitMachineConfig

Event ID 1: An error with reference Id=evtErrorId was encountered while processing the hive 'evtHiveName'.

Description

Message #

Fields #

Event ID 2: Initial Machine Configuration processing of hive 'evtHiveName' has completed.

Description

Message #

Fields #

Event ID 3: Initial Machine Configuration was unable to unload the IMC hive once processing was completed.

Description

Message #

Fields #

Event ID 4: Initial Machine Configuration was unable to update the system BCD to prevent future execution.

Description

Message #

Fields #

Event ID 5: Value blocked: evtValueNameLength under the key, evtKeyPathLength, was NOT set after failing validation.

Description

Message #

Fields #

Event ID 6: Value set: evtValueNameLength under the key, evtKeyPathLength, was set after passing validation.

Description

Message #

Fields #

Provenance

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