Potential Privacy Control Bypass via Localhost Secure Copy

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Potential Privacy Control Bypass via Localhost Secure Copy

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Identifies use of the Secure Copy Protocol (SCP) to copy files locally by abusing the auto addition of the Secure Shell Daemon (sshd) to the authorized application list for Full Disk Access. This may indicate attempts to bypass macOS privacy controls to access sensitive files.

Rule type: eql

Rule indices:

  • auditbeat-*
  • logs-endpoint.events.*

Severity: high

Risk score: 73

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
  • Privilege Escalation
  • Defense Evasion

Version: 100 (version history)

Added (Elastic Stack release): 7.12.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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process where event.type in ("start", "process_started") and
process.name:"scp" and process.args:"StrictHostKeyChecking=no" and
process.command_line:("scp *localhost:/*", "scp *127.0.0.1:/*") and
not process.args:"vagrant@*127.0.0.1*"

Threat mapping

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Framework: MITRE ATT&CKTM

Rule version history

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Version 100 (8.5.0 release)
  • Formatting only
Version 5 (8.4.0 release)
  • Updated query, changed from:

    process where event.type in ("start", "process_started") and
    process.name:"scp" and process.args:"StrictHostKeyChecking=no" and
    process.command_line:("scp *localhost:/*", "scp *127.0.0.1:/*") and
    not process.args:"vagrant@*127.0.0.1*"
Version 3 (8.3.0 release)
  • Formatting only
Version 2 (8.2.0 release)
  • Formatting only