Ruben Groenewoud
2e6ec33141
* [New Rule] Polkit Policy Creation * Update persistence_polkit_policy_creation.toml
95 lines
3.6 KiB
TOML
95 lines
3.6 KiB
TOML
[metadata]
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creation_date = "2025/01/16"
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integration = ["endpoint", "sentinel_one_cloud_funnel"]
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maturity = "production"
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updated_date = "2025/01/16"
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[rule]
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author = ["Elastic"]
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description = """
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This rule monitors for the creation of Polkit policy files on Linux systems. Polkit policy files are used to
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define the permissions for system-wide services and applications. The creation of new Polkit policy files may
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indicate an attempt to modify the authentication process, which could be used for persistence by an adversary.
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"""
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from = "now-9m"
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index = ["logs-endpoint.events.file*", "logs-sentinel_one_cloud_funnel.*", "endgame-*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Polkit Policy Creation"
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risk_score = 21
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rule_id = "0f54e947-9ab3-4dff-9e8d-fb42493eaa2f"
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severity = "low"
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tags = [
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"Domain: Endpoint",
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"OS: Linux",
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"Use Case: Threat Detection",
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"Tactic: Credential Access",
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"Tactic: Persistence",
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"Data Source: Elastic Defend",
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"Data Source: SentinelOne",
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"Data Source: Elastic Endgame",
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]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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file where host.os.type == "linux" and event.type == "creation" and process.executable != null and
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file.extension in ("rules", "pkla", "policy") and file.path like~ (
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// Rule files
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"/etc/polkit-1/rules.d/*", "/usr/share/polkit-1/rules.d/*",
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// pkla files
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"/etc/polkit-1/localauthority/*", "/var/lib/polkit-1/localauthority/*",
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// Action files
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"/usr/share/polkit-1/actions/*",
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// Misc. legacy paths
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"/lib/polkit-1/rules.d/*", "/lib64/polkit-1/rules.d/*", "/var/lib/polkit-1/rules.d/*"
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) and not (
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process.executable in (
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"/bin/dpkg", "/usr/bin/dpkg", "/bin/dockerd", "/usr/bin/dockerd", "/usr/sbin/dockerd", "/bin/microdnf",
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"/usr/bin/microdnf", "/bin/rpm", "/usr/bin/rpm", "/bin/snapd", "/usr/bin/snapd", "/bin/yum", "/usr/bin/yum",
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"/bin/dnf", "/usr/bin/dnf", "/bin/podman", "/usr/bin/podman", "/bin/dnf-automatic", "/usr/bin/dnf-automatic",
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"/bin/pacman", "/usr/bin/pacman", "/usr/bin/dpkg-divert", "/bin/dpkg-divert", "/sbin/apk", "/usr/sbin/apk",
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"/usr/local/sbin/apk", "/usr/bin/apt", "/usr/sbin/pacman", "/bin/podman", "/usr/bin/podman", "/usr/bin/puppet",
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"/bin/puppet", "/opt/puppetlabs/puppet/bin/puppet", "/usr/bin/chef-client", "/bin/chef-client",
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"/bin/autossl_check", "/usr/bin/autossl_check", "/proc/self/exe", "/dev/fd/*", "/usr/bin/pamac-daemon",
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"/bin/pamac-daemon", "/usr/lib/snapd/snapd", "/usr/local/bin/dockerd", "/usr/bin/crio", "/usr/sbin/crond",
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"/opt/puppetlabs/puppet/bin/ruby", "/usr/libexec/platform-python", "/kaniko/kaniko-executor",
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"/usr/local/bin/dockerd", "/usr/bin/podman", "/bin/install", "/proc/self/exe", "/usr/lib/systemd/systemd",
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"/usr/sbin/sshd", "/usr/bin/gitlab-runner", "/opt/gitlab/embedded/bin/ruby", "/usr/sbin/gdm", "/usr/bin/install",
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"/usr/local/manageengine/uems_agent/bin/dcregister", "/usr/local/bin/pacman"
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) or
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process.executable like~ (
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"/nix/store/*", "/var/lib/dpkg/*", "/tmp/vmis.*", "/snap/*", "/dev/fd/*", "/usr/lib/virtualbox/*"
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)
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)
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1543"
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name = "Create or Modify System Process"
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reference = "https://attack.mitre.org/techniques/T1543/"
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[rule.threat.tactic]
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id = "TA0003"
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name = "Persistence"
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reference = "https://attack.mitre.org/tactics/TA0003/"
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1556"
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name = "Modify Authentication Process"
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reference = "https://attack.mitre.org/techniques/T1556/"
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[rule.threat.tactic]
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id = "TA0006"
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name = "Credential Access"
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reference = "https://attack.mitre.org/tactics/TA0006/"
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