UAC Bypass via ICMLuaUtil

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

Detects the pattern of UAC Bypass using ICMLuaUtil Elevated COM interface

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1548.002` Abuse Elevation Control Mechanism: Bypass User Account Control
Defense Evasion	`T1548.002` Abuse Elevation Control Mechanism: Bypass User Account Control

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `selection`

or:
ParentCommandLine|contains: '/Processid:{3E5FC7F9-9A51-4367-9063-A120244FBEC7}'
ParentCommandLine|contains: '/Processid:{D2E7041B-2927-42FB-8E9F-7CE93B6DC937}'
ParentImage|endswith: '\dllhost.exe'

Stage 2: `not filter`

or:
Image|endswith: '\WerFault.exe'
OriginalFileName: WerFault.exe

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`	ends_with	`\WerFault.exe` corpus 8 (sigma 8)
`OriginalFileName`	eq	`WerFault.exe` corpus 3 (sigma 3)
`ParentCommandLine`	match	`/Processid:{3E5FC7F9-9A51-4367-9063-A120244FBEC7}` `/Processid:{D2E7041B-2927-42FB-8E9F-7CE93B6DC937}`
`ParentImage`	ends_with	`\dllhost.exe` corpus 5 (sigma 5)