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Elastic Docs ›Elastic Security Solution [8.0] ›Detections and alerts ›Prebuilt rule reference

WebProxy Settings Modification

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WebProxy Settings Modification

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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&CKTM

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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