Potential Privacy Control Bypass via Localhost Secure Copy

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: 5m

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

Maximum alerts per execution: 100

References:

https://www.trendmicro.com/en_us/research/20/h/xcsset-mac-malware—infects-xcode-projects—uses-0-days.html

Tags:

Elastic
Host
macOS
Threat Detection
Privilege Escalation
Defense Evasion

Version: 101

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

edit

Rule query

edit

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*"

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Abuse Elevation Control Mechanism
- ID: T1548
- Reference URL: https://attack.mitre.org/techniques/T1548/
Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
Technique:
- Name: Abuse Elevation Control Mechanism
- ID: T1548
- Reference URL: https://attack.mitre.org/techniques/T1548/

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