Suspicious Outlook Child Process

Severity: high
Author: Michael Haag, Florian Roth (Nextron Systems), Markus Neis, Elastic, FPT.EagleEye Team
Source: upstream

Detects a suspicious process spawning from an Outlook process.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1204.002` User Execution: Malicious File

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:
Image|endswith: '\AppVLP.exe'
Image|endswith: '\bash.exe'
Image|endswith: '\cmd.exe'
Image|endswith: '\cscript.exe'
Image|endswith: '\forfiles.exe'
Image|endswith: '\hh.exe'
Image|endswith: '\mftrace.exe'
Image|endswith: '\msbuild.exe'
Image|endswith: '\msdt.exe'
Image|endswith: '\mshta.exe'
Image|endswith: '\msiexec.exe'
Image|endswith: '\powershell.exe'
Image|endswith: '\pwsh.exe'
Image|endswith: '\regsvr32.exe'
Image|endswith: '\schtasks.exe'
Image|endswith: '\scrcons.exe'
Image|endswith: '\scriptrunner.exe'
Image|endswith: '\sh.exe'
Image|endswith: '\svchost.exe'
Image|endswith: '\wmic.exe'
Image|endswith: '\wscript.exe'
ParentImage|endswith: '\OUTLOOK.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.