Network Connection to OAST Domain via Script Interpreter

Last updated 16 days ago on 2026-09-23

Created 8 months ago on 2026-01-30

About

Detects when a package service such as npm, gems, or a script interpreter makes an outbound network connection to an OAST (Out-of-band Application Security Testing) domain. Threat actors have been using OAST domains to exfiltrate sensitive data from compromised systems via malicious packages.

Tags

Domain: EndpointOS: macOSOS: LinuxOS: WindowsUse Case: Threat DetectionTactic: Command and ControlData Source: Elastic DefendNoise: LowPerformance: NormalProfile: RecommendedThreat: Supply ChainThreat: Web Service AbuseRule Type: Event Correlation (EQL)Platform: macOSPlatform: WindowsPlatform: LinuxLanguage: eql

Severity

high

Risk Score

MITRE ATT&CK™

Command and Control (TA0011)(external, opens in a new tab or window)

↳ Web Service (T1102)(external, opens in a new tab or window)

Exfiltration (TA0010)(external, opens in a new tab or window)

↳ Exfiltration Over Web Service (T1567)(external, opens in a new tab or window)

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

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

Initial Access (TA0001)(external, opens in a new tab or window)

↳ Supply Chain Compromise (T1195)(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: logs-endpoint.events.network-*logs-endpoint.events.process-*
Related Integrations: endpoint(external, opens in a new tab or window)
Query

✄𐘗text code block:
✄𐘗sequence by process.entity_id with maxspan=1m
  [process where event.type == "start" and event.action in ("exec", "start") and
    (process.name : ("node", "node.exe", "bun", "bun.exe", "osascript", "powershell.exe") or process.name : ("python*", "ruby*", "perl*"))]
  [network where (destination.domain like "*.oast*" or dns.question.name like "*.oast*")]

Install detection rules in Elastic Security

Detect Network Connection to OAST Domain via Script Interpreter 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).