Suspicious JavaScript Execution via Deno

Last updated 2 days ago on 2026-03-19

Created 2 days ago on 2026-03-19

About

Detects execution of JavaScript via Deno with suspicious command-line patterns (base64, eval, http, or import in a javascript context). Adversaries may abuse Deno to run malicious JavaScript for execution or staging.

Tags

Domain: EndpointOS: WindowsUse Case: Threat DetectionTactic: ExecutionData Source: Elastic DefendData Source: SysmonData Source: SentinelOneData Source: Microsoft Defender for EndpointData Source: CrowdstrikeData Source: Elastic EndgameData Source: Windows Security Event LogsLanguage: eql

Severity

high

Risk Score

MITRE ATT&CK™

Execution (TA0002)(external, opens in a new tab or window)

↳ Command and Scripting Interpreter (T1059)(external, opens in a new tab or window)

License

Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type

Event Correlation Rule

Integration Pack

Prebuilt Security Detection Rules

Index Patterns

endgame-*logs-crowdstrike.fdr*logs-endpoint.events.process-*logs-m365_defender.event-*logs-sentinel_one_cloud_funnel.*logs-system.security*logs-windows.sysmon_operational-*winlogbeat-*

Related Integrations

endpoint(external, opens in a new tab or window)

windows(external, opens in a new tab or window)

sentinel_one_cloud_funnel(external, opens in a new tab or window)

m365_defender(external, opens in a new tab or window)

system(external, opens in a new tab or window)

crowdstrike(external, opens in a new tab or window)

Query

✄𐘗text code block:
✄𐘗process where host.os.type == "windows" and event.type == "start" and
 (process.name : "deno.exe" or ?process.pe.original_file_name == "deno.exe" or ?process.code_signature.subject_name == "Deno Land Inc.") and
 process.command_line : ("*javascript*base64*", "*eval(*", "*http*", "*javascript*import*")

Install detection rules in Elastic Security

Detect Suspicious JavaScript Execution via Deno in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).