UAC Bypass With Fake DLL

Severity: high
Author: oscd.community, Dmitry Uchakin
Source: upstream

Attempts to load dismcore.dll after dropping it

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1574.001` Hijack Execution Flow: DLL
Privilege Escalation	`T1548.002` Abuse Elevation Control Mechanism: Bypass User Account Control, `T1574.001` Hijack Execution Flow: DLL
Defense Evasion	`T1548.002` Abuse Elevation Control Mechanism: Bypass User Account Control, `T1574.001` Hijack Execution Flow: DLL

Event coverage

Provider	Event ID	Title
Sysmon	7	Image loaded

Stages and Predicates

Stage 1: `selection`

Image|endswith: '\dism.exe'
ImageLoaded|endswith: '\dismcore.dll'

Stage 2: `not filter`

ImageLoaded: 'C:\Windows\System32\Dism\dismcore.dll'

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	`\dism.exe` corpus 4 (sigma 4)
`ImageLoaded`	ends_with	`\dismcore.dll` corpus 2 (sigma 2)
`ImageLoaded`	eq	`C:\Windows\System32\Dism\dismcore.dll`