Suspicious Remote Child Process From Outlook

Severity: high
Author: Markus Neis, Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects a suspicious child process spawning from Outlook where the image is located in a remote location (SMB/WebDav shares).

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059` Command and Scripting Interpreter
Defense Evasion	`T1202` Indirect Command Execution

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`

Image|startswith: '\\\\'
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.