Rundll32 Registered COM Objects

Severity: high
Author: frack113
Source: upstream

load malicious registered COM objects

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1546.015` Event Triggered Execution: Component Object Model Hijacking
Privilege Escalation	`T1546.015` Event Triggered Execution: Component Object Model Hijacking

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\rundll32.exe'
OriginalFileName: RUNDLL32.EXE

Stage 2: `all of selection_cli`

or:
CommandLine|contains: '-localserver '
CommandLine|contains: '-sta '
CommandLine|contains: '{'
CommandLine|contains: '}'

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
`CommandLine`	match	`-localserver` `-sta` `{` `}`
`Image`	ends_with	`\rundll32.exe` corpus 76 (sigma 76)
`OriginalFileName`	eq	`RUNDLL32.EXE` corpus 28 (sigma 25, splunk 3)