IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Potential Cookies Theft via Browser Debugging

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Potential Cookies Theft via Browser Debugging

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Identifies the execution of a Chromium based browser with the debugging process argument, which may indicate an attempt to steal authentication cookies. An adversary may steal web application or service session cookies and use them to gain access web applications or Internet services as an authenticated user without needing credentials.

Rule type: eql

Rule indices:

auditbeat-*
winlogbeat-*
logs-endpoint.events.*
logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 33

References:

Tags:

Domain: Endpoint
OS: Linux
OS: Windows
OS: macOS
Use Case: Threat Detection
Tactic: Credential Access
Data Source: Elastic Defend

Version: 105

Rule authors:

Elastic

Rule license: Elastic License v2

Setup

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Setup

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define event.ingested and default fallback for EQL rules was not added until version 8.2. Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate event.ingested to @timestamp. For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html

Rule query

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process where event.type in ("start", "process_started", "info") and
  process.name in (
             "Microsoft Edge",
             "chrome.exe",
             "Google Chrome",
             "google-chrome-stable",
             "google-chrome-beta",
             "google-chrome",
             "msedge.exe") and
   process.args : ("--remote-debugging-port=*",
                   "--remote-debugging-targets=*",
                   "--remote-debugging-pipe=*") and
   process.args : "--user-data-dir=*" and not process.args:"--remote-debugging-port=0"

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: Steal Web Session Cookie
- ID: T1539
- Reference URL: https://attack.mitre.org/techniques/T1539/

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