Renamed VsCode Code Tunnel Execution - File Indicator

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

Detects the creation of a file with the name "code_tunnel.json" which indicate execution and usage of VsCode tunneling utility by an "Image" or "Process" other than VsCode.

Event coverage

Provider	Event ID	Title
Sysmon	11	FileCreate

Stages and Predicates

Stage 1: `selection`

TargetFilename|endswith: '\code_tunnel.json'

Stage 2: `not 1 of filter_main_legit_name`

or:
Image|endswith: '\code-tunnel.exe'
Image|endswith: '\code.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	`\code-tunnel.exe` corpus 2 (sigma 2) `\code.exe` corpus 3 (sigma 3)
`TargetFilename`	ends_with	`\code_tunnel.json`