Microsoft Office Protected View Disabled

Status: test
Severity: high
Log source: product windows, category registry_set
Author: frack113, Nasreddine Bencherchali (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Detects changes to Microsoft Office protected view registry keys with which the attacker disables this feature.

MITRE ATT&CK coverage

Tactic	Techniques
Defense Impairment	`T1685` Disable or Modify Tools

Event coverage

Provider	Event	Title
Sysmon	Event ID 13	RegistryEvent (Value Set)

Rule body yaml

title: Microsoft Office Protected View Disabled
id: a5c7a43f-6009-4a8c-80c5-32abf1c53ecc
related:
    - id: 7c637634-c95d-4bbf-b26c-a82510874b34
      type: obsolete
status: test
description: Detects changes to Microsoft Office protected view registry keys with which the attacker disables this feature.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md
    - https://unit42.paloaltonetworks.com/unit42-gorgon-group-slithering-nation-state-cybercrime/
    - https://yoroi.company/research/cyber-criminal-espionage-operation-insists-on-italian-manufacturing/
    - https://admx.help/HKCU/software/policies/microsoft/office/16.0/excel/security/protectedview
author: frack113, Nasreddine Bencherchali (Nextron Systems)
date: 2021-06-08
modified: 2023-08-17
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    product: windows
    category: registry_set
detection:
    selection_path:
        TargetObject|contains|all:
            - '\SOFTWARE\Microsoft\Office\'
            - '\Security\ProtectedView\'
    selection_values_1:
        Details: 'DWORD (0x00000001)'
        TargetObject|endswith:
            - '\DisableAttachementsInPV' # Turn off Protected View for attachments opened from Outlook
            - '\DisableInternetFilesInPV' # Turn off Protected View for files downloaded from Internet zone
            - '\DisableIntranetCheck' # Turn off Protected View for file located in UNC paths
            - '\DisableUnsafeLocationsInPV' # Turn off Protected View for unsafe locations
    selection_values_0:
        Details: 'DWORD (0x00000000)'
        TargetObject|endswith:
            - '\enabledatabasefileprotectedview'
            - '\enableforeigntextfileprotectedview'
    condition: selection_path and 1 of selection_values_*
falsepositives:
    - Unlikely
level: high

Stages and Predicates

Stage 0: `condition`

selection_path and 1 of selection_values_*

Stage 1: `selection_path`

selection_path:
    TargetObject|contains|all:
        - '\SOFTWARE\Microsoft\Office\'
        - '\Security\ProtectedView\'

Stage 2: `selection_values_1`

selection_values_1:
    Details: 'DWORD (0x00000001)'
    TargetObject|endswith:
        - '\DisableAttachementsInPV'
        - '\DisableInternetFilesInPV'
        - '\DisableIntranetCheck'
        - '\DisableUnsafeLocationsInPV'

Stage 3: `selection_values_0`

selection_values_0:
    Details: 'DWORD (0x00000000)'
    TargetObject|endswith:
        - '\enabledatabasefileprotectedview'
        - '\enableforeigntextfileprotectedview'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`Details`	eq	`DWORD (0x00000000)` corpus 38 (sigma 36, chronicle 2) `DWORD (0x00000001)` corpus 40 (sigma 36, chronicle 4)
`TargetObject`	ends_with	`\DisableAttachementsInPV` `\DisableInternetFilesInPV` `\DisableIntranetCheck` `\DisableUnsafeLocationsInPV` `\enabledatabasefileprotectedview` `\enableforeigntextfileprotectedview`
`TargetObject`	match	`\SOFTWARE\Microsoft\Office\` corpus 4 (sigma 4) `\Security\ProtectedView\`

`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 Office Protected View Disabled

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection_path`

Stage 2: `selection_values_1`

Stage 3: `selection_values_0`

Indicators

Keyboard shortcuts

Search operators

Microsoft Office Protected View Disabled

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection_path

Stage 2: selection_values_1

Stage 3: selection_values_0

Indicators

Stage 0: `condition`

Stage 1: `selection_path`

Stage 2: `selection_values_1`

Stage 3: `selection_values_0`