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Detection rules › Sigma

Potential Signing Bypass Via Windows Developer Features - Registry

Severity
high
Author
Nasreddine Bencherchali (Nextron Systems)
Source
upstream

Detects when the enablement of developer features such as "Developer Mode" or "Application Sideloading". Which allows the user to install untrusted packages.

Event coverage

ProviderEvent IDTitle
Sysmon13RegistryEvent (Value Set)

Stages and Predicates

Stage 1: selection

or:
TargetObject|endswith: '\AllowAllTrustedApps'
TargetObject|endswith: '\AllowDevelopmentWithoutDevLicense'
or:
TargetObject|contains: '\Microsoft\Windows\CurrentVersion\AppModelUnlock'
TargetObject|contains: '\Policies\Microsoft\Windows\Appx\'
Details: 'DWORD (0x00000001)'

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.

FieldKindValues
Detailseq
  • DWORD (0x00000001) corpus 37 (sigma 37)
TargetObjectends_with
  • \AllowAllTrustedApps
  • \AllowDevelopmentWithoutDevLicense
TargetObjectmatch
  • \Microsoft\Windows\CurrentVersion\AppModelUnlock
  • \Policies\Microsoft\Windows\Appx\