WebProxy Settings Modification

Identifies the use of the built-in networksetup command to configure webproxy settings. This may indicate an attempt to hijack web browser traffic for credential access via traffic sniffing or redirection.

Rule type: query

Rule indices:

auditbeat-*
logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

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

Maximum alerts per execution: 100

References:

Tags:

Elastic
Host
macOS
Threat Detection
Credential Access

Version: 2 (version history)

Added (Elastic Stack release): 7.12.0

Last modified (Elastic Stack release): 7.13.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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Legitimate WebProxy Settings Modification

Rule query

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event.category : process and event.type : start and process.name :
networksetup and process.args : (("-setwebproxy" or
"-setsecurewebproxy" or "-setautoproxyurl") and not (Bluetooth or
off)) and not process.parent.executable :
("/Library/PrivilegedHelperTools/com.80pct.FreedomHelper" or
"/Applications/Fiddler
Everywhere.app/Contents/Resources/app/out/WebServer/Fiddler.WebUi" or
"/usr/libexec/xpcproxy")

Threat mapping

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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/

Rule version history

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Version 2 (7.13.0 release)

Updated query, changed from:

event.category:process and event.type:start and
process.name:networksetup and process.args:("-setwebproxy" or
"-setsecurewebproxy" or "-setautoproxyurl")

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