UAC Bypass Using EventVwr

Severity: high
Author: Antonio Cocomazzi (idea), Florian Roth (Nextron Systems)
Source: upstream

Detects the pattern of a UAC bypass using Windows Event Viewer

Event coverage

Provider	Event ID	Title
Sysmon	11	FileCreate

Stages and Predicates

Stage 1: `selection`

or:
TargetFilename|endswith: '\Microsoft\Event Viewer\RecentViews'
TargetFilename|endswith: '\Microsoft\EventV~1\RecentViews'

Stage 2: `not filter`

or:
Image|startswith: 'C:\Windows\SysWOW64\'
Image|startswith: 'C:\Windows\System32\'

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
`Image`	starts_with	`C:\Windows\SysWOW64\` corpus 16 (sigma 16) `C:\Windows\System32\` corpus 16 (sigma 16)
`TargetFilename`	ends_with	`\Microsoft\Event Viewer\RecentViews` `\Microsoft\EventV~1\RecentViews`