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Modification of Standard Authentication Module or Configuration

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Modification of Standard Authentication Module or Configuration

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Adversaries may modify the standard authentication module for persistence via patching the normal authorization process or modifying the login configuration to allow unauthorized access or elevate privileges.

Rule type: query

Rule indices:

auditbeat-*
logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5m

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

Maximum alerts per execution: 100

References:

Tags:

Domain: Endpoint
OS: macOS
OS: Linux
Use Case: Threat Detection
Tactic: Credential Access
Tactic: Persistence

Version: 103

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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event.category:file and event.type:change and
  (file.name:pam_*.so or file.path:(/etc/pam.d/* or /private/etc/pam.d/* or /usr/lib64/security/*)) and
  process.executable:
    (* and
      not
      (
        /bin/yum or
        "/usr/sbin/pam-auth-update" or
        /usr/libexec/packagekitd or
        /usr/bin/dpkg or
        /usr/bin/vim or
        /usr/libexec/xpcproxy or
        /usr/bin/bsdtar or
        /usr/local/bin/brew or
        /usr/bin/rsync or
        /usr/bin/yum or
        /var/lib/docker/*/bin/yum or
        /var/lib/docker/*/bin/dpkg or
        ./merged/var/lib/docker/*/bin/dpkg or
        "/System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/XPCServices/package_script_service.xpc/Contents/MacOS/package_script_service"
      )
    ) and
  not file.path:
         (
           /tmp/snap.rootfs_*/pam_*.so or
           /tmp/newroot/lib/*/pam_*.so or
           /private/var/folders/*/T/com.apple.fileprovider.ArchiveService/TemporaryItems/*/lib/security/pam_*.so or
           /tmp/newroot/usr/lib64/security/pam_*.so
         )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Create or Modify System Process
- ID: T1543
- Reference URL: https://attack.mitre.org/techniques/T1543/
Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: Modify Authentication Process
- ID: T1556
- Reference URL: https://attack.mitre.org/techniques/T1556/

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