Execution Of Non-Existing File

Severity: high
Author: Max Altgelt (Nextron Systems)
Source: upstream

Checks whether the image specified in a process creation event is not a full, absolute path (caused by process ghosting or other unorthodox methods to start a process)

Event coverage

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

Stages and Predicates

Stage 1: `not image_absolute_path`

Image|contains: '\'

Stage 2: `not 1 of filter*`

or:
CommandLine: MemCompression
CommandLine: Registry
CommandLine: vmmem
Image: ''
Image: -
Image: MemCompression
Image: Registry
Image: System
Image: vmmem
Image: null

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`	eq	`MemCompression` `Registry` `vmmem`
`Image`	eq	`-` corpus 2 (sigma 2) `MemCompression` corpus 2 (sigma 2) `Registry` corpus 3 (sigma 3) `System` corpus 8 (sigma 8) `vmmem` corpus 2 (sigma 2)
`Image`	match	`\`