WebProxy Settings Modification

Elastic Stack Serverless Security

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: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

• https://unit42.paloaltonetworks.com/mac-malware-steals-cryptocurrency-exchanges-cookies/
• https://objectivebythesea.com/v2/talks/OBTS_v2_Zohar.pdf

Tags:

• Elastic
• Host
• macOS
• Threat Detection
• Credential Access

Version: 101

Rule authors:

• Elastic

Rule license: Elastic License v2

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")

Framework: MITRE ATT&CKTM

• 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/