New Process Created Via Taskmgr.EXE

Severity: low
Author: Florian Roth (Nextron Systems)
Source: upstream

Detects the creation of a process via the Windows task manager. This might be an attempt to bypass UAC

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1036` Masquerading

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation
Security-Auditing	4688	A new process has been created.

Stages and Predicates

Stage 1: `selection`

ParentImage|endswith: '\taskmgr.exe'

Stage 2: `not 1 of filter_main_generic`

or:
Image|endswith: ':\Windows\System32\Taskmgr.exe'
Image|endswith: ':\Windows\System32\mmc.exe'
Image|endswith: ':\Windows\System32\resmon.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	`:\Windows\System32\Taskmgr.exe` `:\Windows\System32\mmc.exe` corpus 3 (sigma 3) `:\Windows\System32\resmon.exe`
`ParentImage`	ends_with	`\taskmgr.exe`