Microsoft-Antimalware-AMFilter

11 events across 1 channel

Event	Title	Channel	Sample
1	AMFilter_CacheFlush	Application	N
2	AMFilter_CacheRemove	Application	N
3	AMFilter_CacheHit	Application	Y
4	AMFilter_CacheMiss	Application	N
5	AMFilter_CacheAdd	Application	N
6	AMFilter_SeqReadFlag	Application	Y
7	AMFilter_TrustedProcess	Application	Y
8	AMFilter_ProcessContext	Application	Y
9	AMFilter_FileScan	Application	Y
10	AMFilter_DeleteStreamContext	Application	Y
11	AMFilter_FileScanResult	Application	Y

Event ID 1: AMFilter_CacheFlush

Provider: Microsoft-Antimalware-AMFilter
Channel: Application
Task: AMFilter_CacheFlush

Event ID 2: AMFilter_CacheRemove

Provider: Microsoft-Antimalware-AMFilter
Channel: Application
Task: AMFilter_CacheRemove

Fields #

Name	Description
`File_ID` UInt64

Event ID 3: AMFilter_CacheHit

Provider: Microsoft-Antimalware-AMFilter
Channel: Application
Also via: realtime ETW trace
Level: Verbose
Task: AMFilter_CacheHit
Opcode: win:Info

Fields #

Name	Description
`File_ID` UInt64

Example Event #

{
  "system": {
    "provider": "Microsoft-Antimalware-AMFilter",
    "guid": "{CFEB0608-330E-4410-B00D-56D8DA9986E6}",
    "event_source_name": "",
    "event_id": 3,
    "version": 0,
    "level": 5,
    "task": 3,
    "opcode": 0,
    "keywords": "0x0000000000000004",
    "time_created": "2026-06-02T05:20:52.804+00:00",
    "event_record_id": 0,
    "correlation": {},
    "execution": {
      "process_id": 11608,
      "thread_id": 14528
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "File_ID": 63791
  },
  "message": "AMFilter_CacheHit"
}

Event ID 4: AMFilter_CacheMiss

Provider: Microsoft-Antimalware-AMFilter
Channel: Application
Task: AMFilter_CacheMiss

Fields #

Name	Description
`File_ID` UInt64

Event ID 5: AMFilter_CacheAdd

Provider: Microsoft-Antimalware-AMFilter
Channel: Application
Task: AMFilter_CacheAdd

Fields #

Name	Description
`File_ID` UInt64

Event ID 6: AMFilter_SeqReadFlag

Provider: Microsoft-Antimalware-AMFilter
Channel: Application
Level: Informational
Task: AMFilter_SeqReadFlag
Opcode: win:Info

Example Event #

{
  "system": {
    "provider": "Microsoft-Antimalware-AMFilter",
    "guid": "{CFEB0608-330E-4410-B00D-56D8DA9986E6}",
    "event_source_name": "",
    "event_id": 6,
    "version": 0,
    "level": 4,
    "task": 6,
    "opcode": 0,
    "keywords": "0x0000000000000010",
    "time_created": "2026-06-02T04:10:22.090+00:00",
    "event_record_id": 0,
    "correlation": {},
    "execution": {
      "process_id": 5396,
      "thread_id": 6876
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {},
  "message": "AMFilter_SeqReadFlag"
}

Event ID 7: AMFilter_TrustedProcess

Provider: Microsoft-Antimalware-AMFilter
Channel: Application
Also via: realtime ETW trace
Level: Informational
Task: AMFilter_TrustedProcess
Opcode: win:Info

Fields #

Name	Description
`Pid` UInt32
`Reason` UnicodeString
`Trusted` UInt32
`TotalTrusted` UInt32
`TotalUntrusted` UInt32
`Path` UnicodeString

Example Event #

{
  "system": {
    "provider": "Microsoft-Antimalware-AMFilter",
    "guid": "{CFEB0608-330E-4410-B00D-56D8DA9986E6}",
    "event_source_name": "",
    "event_id": 7,
    "version": 0,
    "level": 4,
    "task": 7,
    "opcode": 0,
    "keywords": "0x0000000000000008",
    "time_created": "2026-06-02T05:18:28.325+00:00",
    "event_record_id": 0,
    "correlation": {},
    "execution": {
      "process_id": 10432,
      "thread_id": 20476
    },
    "channel": "ETW Trace",
    "computer": "JD-DC01-2022",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "Path": "NULL",
    "Pid": 18116,
    "Reason": "create",
    "TotalTrusted": 97,
    "TotalUntrusted": 179,
    "Trusted": 0
  },
  "message": "AMFilter_TrustedProcess"
}

Event ID 8: AMFilter_ProcessContext

Provider: Microsoft-Antimalware-AMFilter
Channel: Application
Also via: realtime ETW trace
Level: Informational
Task: AMFilter_ProcessContext
Opcode: win:Info

Fields #

Name	Description
`Pid` UInt32
`Reason` UnicodeString
`Flags` UInt32
`ProcessFilterFlags` UInt32
`ProcessName` UnicodeString
`VmHardenType` UInt64
`ExemptVmHardenedTypes` UInt64

Example Event #

{
  "system": {
    "provider": "Microsoft-Antimalware-AMFilter",
    "guid": "{CFEB0608-330E-4410-B00D-56D8DA9986E6}",
    "event_source_name": "",
    "event_id": 8,
    "version": 0,
    "level": 4,
    "task": 8,
    "opcode": 0,
    "keywords": "0x0000000000000002",
    "time_created": "2026-06-02T05:18:28.325+00:00",
    "event_record_id": 0,
    "correlation": {},
    "execution": {
      "process_id": 10432,
      "thread_id": 20476
    },
    "channel": "ETW Trace",
    "computer": "JD-DC01-2022",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "ExemptVmHardenedTypes": 18446744073709551615,
    "Flags": 0,
    "Pid": 18116,
    "ProcessFilterFlags": 0,
    "ProcessName": "NULL",
    "Reason": "create",
    "VmHardenType": 0
  },
  "message": "AMFilter_ProcessContext"
}

Event ID 9: AMFilter_FileScan

Provider: Microsoft-Antimalware-AMFilter
Channel: Application
Also via: realtime ETW trace
Level: Informational
Task: AMFilter_FileScan
Opcode: win:Info

Fields #

Name	Description
`FileName` UnicodeString
`Reason` UnicodeString
`IoStatusBlockForNewFile` UInt64

Example Event #

{
  "system": {
    "provider": "Microsoft-Antimalware-AMFilter",
    "guid": "{CFEB0608-330E-4410-B00D-56D8DA9986E6}",
    "event_source_name": "",
    "event_id": 9,
    "version": 0,
    "level": 4,
    "task": 9,
    "opcode": 0,
    "keywords": "0x0000000000000001",
    "time_created": "2026-06-02T05:20:52.826+00:00",
    "event_record_id": 0,
    "correlation": {},
    "execution": {
      "process_id": 13192,
      "thread_id": 2864
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "FileName": "\\Device\\HarddiskVolume4\\Users\\localuser\\AppData\\Local\\Temp\\__PSScriptPolicyTest_5xpcu4jq.upi.ps1",
    "IoStatusBlockForNewFile": 4294967295,
    "Reason": "OnOpen"
  },
  "message": "AMFilter_FileScan"
}

Event ID 10: AMFilter_DeleteStreamContext

Provider: Microsoft-Antimalware-AMFilter
Channel: Application
Also via: realtime ETW trace
Level: Verbose
Task: AMFilter_DeleteStreamContext
Opcode: win:Info

Fields #

Name	Description
`File_ID` UInt64

Example Event #

{
  "system": {
    "provider": "Microsoft-Antimalware-AMFilter",
    "guid": "{CFEB0608-330E-4410-B00D-56D8DA9986E6}",
    "event_source_name": "",
    "event_id": 10,
    "version": 0,
    "level": 5,
    "task": 10,
    "opcode": 0,
    "keywords": "0x0000000000000020",
    "time_created": "2026-06-02T05:18:28.782+00:00",
    "event_record_id": 0,
    "correlation": {},
    "execution": {
      "process_id": 4,
      "thread_id": 5412
    },
    "channel": "ETW Trace",
    "computer": "JD-DC01-2022",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "File_ID": 474663
  },
  "message": "AMFilter_DeleteStreamContext"
}

Event ID 11: AMFilter_FileScanResult

Provider: Microsoft-Antimalware-AMFilter
Channel: Application
Also via: realtime ETW trace
Level: Informational
Task: AMFilter_FileScanResult
Opcode: win:Info

Fields #

Name	Description
`FileName` UnicodeString
`Reason` UInt32
`ScanStatus` UInt32
`State` UInt32
`ScanAttributes` UInt32
`FileId` UInt64
`USN` UInt64

Example Event #

{
  "system": {
    "provider": "Microsoft-Antimalware-AMFilter",
    "guid": "{CFEB0608-330E-4410-B00D-56D8DA9986E6}",
    "event_source_name": "",
    "event_id": 11,
    "version": 0,
    "level": 4,
    "task": 11,
    "opcode": 0,
    "keywords": "0x0000000000000001",
    "time_created": "2026-06-02T05:20:52.830+00:00",
    "event_record_id": 0,
    "correlation": {},
    "execution": {
      "process_id": 13192,
      "thread_id": 2864
    },
    "channel": "ETW Trace",
    "computer": "DESKTOP-FF3N5XK",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "FileId": 2814749767281372,
    "FileName": "\\Device\\HarddiskVolume4\\Users\\localuser\\AppData\\Local\\Temp\\__PSScriptPolicyTest_5xpcu4jq.upi.ps1",
    "Reason": 3,
    "ScanAttributes": 0,
    "ScanStatus": 0,
    "State": 3,
    "USN": 153463912
  },
  "message": "AMFilter_FileScanResult"
}

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 {CFEB0608-330E-4410-B00D-56D8DA9986E6}

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

Observed on:

WS2022-20348.4893, sample captured from a live trace, binary version 4.18.26040.7, captured 2026-06-02
Win11-26200.6584, sample captured from a live trace, binary version 4.18.26040.7, captured 2026-06-02
WS2022-20348.4893, schema read from the registered manifest, binary version 4.18.26040.7, captured 2026-06-02
Win11-26200.6584, schema read from the registered manifest, binary version 4.18.26040.7, 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-Antimalware-AMFilter

Event ID 1: AMFilter_CacheFlush

Event ID 2: AMFilter_CacheRemove

Fields #

Event ID 3: AMFilter_CacheHit

Fields #

Example Event #

Event ID 4: AMFilter_CacheMiss

Fields #

Event ID 5: AMFilter_CacheAdd

Fields #

Event ID 6: AMFilter_SeqReadFlag

Example Event #

Event ID 7: AMFilter_TrustedProcess

Fields #

Example Event #

Event ID 8: AMFilter_ProcessContext

Fields #

Example Event #

Event ID 9: AMFilter_FileScan

Fields #

Example Event #

Event ID 10: AMFilter_DeleteStreamContext

Fields #

Example Event #

Event ID 11: AMFilter_FileScanResult

Fields #

Example Event #

Provenance

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