Microsoft Office Protected View Disabled

Severity: high
Author: frack113, Nasreddine Bencherchali (Nextron Systems)
Source: upstream

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

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1562.001` Impair Defenses: Disable or Modify Tools

Event coverage

Provider	Event ID	Title
Sysmon	13	RegistryEvent (Value Set)

Stages and Predicates

Stage 1: `selection_path`

TargetObject|contains: '\SOFTWARE\Microsoft\Office\'
TargetObject|contains: '\Security\ProtectedView\'

Stage 2: `1 of selection_values_1`

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

Stage 3: `1 of selection_values_0`

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

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 38) `DWORD (0x00000001)` corpus 37 (sigma 37)
`TargetObject`	ends_with	`\DisableAttachementsInPV` `\DisableInternetFilesInPV` `\DisableIntranetCheck` `\DisableUnsafeLocationsInPV` `\enabledatabasefileprotectedview` `\enableforeigntextfileprotectedview`
`TargetObject`	match	`\SOFTWARE\Microsoft\Office\` corpus 2 (sigma 2) `\Security\ProtectedView\`