Elastic Security Detection Rules

Suspicious Web Browser Sensitive File Access

Last updated 5 months ago on 2025-03-18
Created 6 years ago on 2020-01-04

About

Identifies the access or file open of web browser sensitive files by an untrusted/unsigned process or osascript. Adversaries may acquire credentials from web browsers by reading files specific to the target browser.
Tags
Domain: EndpointOS: macOSUse Case: Threat DetectionTactic: Credential AccessData Source: Elastic DefendLanguage: eql
Severity
high
Risk Score
73
MITRE ATT&CK™

Credential Access (TA0006)(opens in a new tab or window)

↳ Steal Web Session Cookie (T1539)(opens in a new tab or window)

↳ Credentials from Password Stores (T1555)(opens in a new tab or window)

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

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
logs-endpoint.events.file-*
Related Integrations

endpoint(opens in a new tab or window)

Query
file where event.action == "open" and host.os.type == "macos" and process.executable != null and
 file.name like~ ("cookies.sqlite",
                  "key?.db",
                  "logins.json",
                  "Cookies",
                  "Cookies.binarycookies",
                  "Login Data") and
 ((process.code_signature.trusted == false or process.code_signature.exists == false) or process.name == "osascript") and
 not process.code_signature.signing_id == "org.mozilla.firefox" and
 not Effective_process.executable like "/Library/Elastic/Endpoint/elastic-endpoint.app/Contents/MacOS/elastic-endpoint"

Install detection rules in Elastic Security

Detect Suspicious Web Browser Sensitive File Access 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(opens in a new tab or window).