Potential Arbitrary Code Execution Via Node.EXE

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

Detects the execution node.exe which is shipped with multiple software such as VMware, Adobe...etc. In order to execute arbitrary code. For example to establish reverse shell as seen in Log4j attacks...etc

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1127` Trusted Developer Utilities Proxy 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_main`

or:
CommandLine|contains: ' --eval '
CommandLine|contains: ' -e '
Image|endswith: '\node.exe'

Stage 2: `1 of selection_action_reverse_shell`

CommandLine|contains: .connect
CommandLine|contains: '.exec('
CommandLine|contains: child_process
CommandLine|contains: net.socket

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`	match	`--eval` `-e` corpus 5 (sigma 5) `.connect` `.exec(` `child_process` `net.socket`
`Image`	ends_with	`\node.exe` corpus 3 (sigma 3)