Unusual Parent Process For Cmd.EXE

Severity: medium
Author: Tim Rauch, Elastic (idea)
Source: upstream

Detects suspicious parent process for cmd.exe

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059` Command and Scripting Interpreter

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`

or:
ParentImage|endswith: '\FlashPlayerUpdateService.exe'
ParentImage|endswith: '\GoogleUpdate.exe'
ParentImage|endswith: '\LogonUI.exe'
ParentImage|endswith: '\SIHClient.exe'
ParentImage|endswith: '\SearchIndexer.exe'
ParentImage|endswith: '\SearchProtocolHost.exe'
ParentImage|endswith: '\WUDFHost.exe'
ParentImage|endswith: '\WerFault.exe'
ParentImage|endswith: '\csrss.exe'
ParentImage|endswith: '\ctfmon.exe'
ParentImage|endswith: '\dllhost.exe'
ParentImage|endswith: '\epad.exe'
ParentImage|endswith: '\jucheck.exe'
ParentImage|endswith: '\jusched.exe'
ParentImage|endswith: '\lsass.exe'
ParentImage|endswith: '\regsvr32.exe'
ParentImage|endswith: '\sihost.exe'
ParentImage|endswith: '\slui.exe'
ParentImage|endswith: '\spoolsv.exe'
ParentImage|endswith: '\sppsvc.exe'
ParentImage|endswith: '\taskhostw.exe'
ParentImage|endswith: '\unsecapp.exe'
ParentImage|endswith: '\wermgr.exe'
ParentImage|endswith: '\wlanext.exe'
Image|endswith: '\cmd.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.