IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Browser Extension Install
editBrowser Extension Install
editIdentifies the install of browser extensions. Malicious browser extensions can be installed via app store downloads masquerading as legitimate extensions, social engineering, or by an adversary that has already compromised a system.
Rule type: eql
Rule indices:
- logs-endpoint.events.file-*
- logs-m365_defender.event-*
- logs-sentinel_one_cloud_funnel.*
- logs-windows.sysmon_operational-*
- winlogbeat-*
- endgame-*
Severity: low
Risk score: 21
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References: None
Tags:
- Domain: Endpoint
- OS: Windows
- Use Case: Threat Detection
- Tactic: Persistence
- Data Source: Elastic Defend
- Data Source: Elastic Endgame
- Data Source: SentinelOne
- Data Source: Sysmon
- Data Source: Microsoft Defender for Endpoint
Version: 102
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editfile where host.os.type == "windows" and event.type : "creation" and
(
/* Firefox-Based Browsers */
(
file.name : "*.xpi" and
file.path : "?:\\Users\\*\\AppData\\Roaming\\*\\Profiles\\*\\Extensions\\*.xpi" and
not
(
process.name : "firefox.exe" and
file.name : ("langpack-*@firefox.mozilla.org.xpi", "*@dictionaries.addons.mozilla.org.xpi")
)
) or
/* Chromium-Based Browsers */
(
file.name : "*.crx" and
file.path : "?:\\Users\\*\\AppData\\Local\\*\\*\\User Data\\Webstore Downloads\\*"
)
)
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
-
Technique:
- Name: Browser Extensions
- ID: T1176
- Reference URL: https://attack.mitre.org/techniques/T1176/