Jonhnathan
b4c84e8a40
* Update Tags * Bump updated date separately to be easy to revert if needed * Update resource_development_ml_linux_anomalous_compiler_activity.toml * Apply changes from the discussion * Update persistence_init_d_file_creation.toml * Update defense_evasion_timestomp_sysmon.toml * Update defense_evasion_application_removed_from_blocklist_in_google_workspace.toml * Update missing Tactic tags * Update unit tests to match new tags * Add missing IG tags * Delete okta_threat_detected_by_okta_threatinsight.toml * Update command_and_control_google_drive_malicious_file_download.toml * Update persistence_rc_script_creation.toml * Mass bump * Update persistence_shell_activity_by_web_server.toml * . --------- Co-authored-by: Mika Ayenson <Mika.ayenson@elastic.co> Co-authored-by: Mika Ayenson <Mikaayenson@users.noreply.github.com>
61 lines
2.4 KiB
TOML
61 lines
2.4 KiB
TOML
[metadata]
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creation_date = "2020/04/23"
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integration = ["endpoint"]
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maturity = "production"
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min_stack_comments = "New fields added: required_fields, related_integrations, setup"
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min_stack_version = "8.3.0"
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updated_date = "2023/06/22"
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[rule]
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author = ["Elastic"]
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description = """
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Telnet provides a command line interface for communication with a remote device or server. This rule identifies Telnet
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network connections to publicly routable IP addresses.
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"""
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false_positives = [
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"""
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Telnet can be used for both benign or malicious purposes. Telnet is included by default in some Linux distributions,
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so its presence is not inherently suspicious. The use of Telnet to manage devices remotely has declined in recent
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years in favor of more secure protocols such as SSH. Telnet usage by non-automated tools or frameworks may be
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suspicious.
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""",
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]
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from = "now-9m"
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index = ["auditbeat-*", "logs-endpoint.events.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Connection to External Network via Telnet"
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references = ["https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml"]
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risk_score = 47
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rule_id = "e19e64ee-130e-4c07-961f-8a339f0b8362"
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severity = "medium"
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tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Lateral Movement"]
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type = "eql"
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query = '''
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sequence by process.entity_id
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[process where host.os.type == "linux" and process.name == "telnet" and event.type == "start"]
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[network where host.os.type == "linux" and process.name == "telnet" and
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not cidrmatch(destination.ip, "10.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", "192.0.0.0/24",
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"192.0.0.0/29", "192.0.0.8/32", "192.0.0.9/32", "192.0.0.10/32", "192.0.0.170/32",
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"192.0.0.171/32", "192.0.2.0/24", "192.31.196.0/24", "192.52.193.0/24",
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"192.168.0.0/16", "192.88.99.0/24", "224.0.0.0/4", "100.64.0.0/10", "192.175.48.0/24",
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"198.18.0.0/15", "198.51.100.0/24", "203.0.113.0/24", "240.0.0.0/4", "::1",
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"FE80::/10", "FF00::/8")]
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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 = "T1021"
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name = "Remote Services"
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reference = "https://attack.mitre.org/techniques/T1021/"
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[rule.threat.tactic]
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id = "TA0008"
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name = "Lateral Movement"
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reference = "https://attack.mitre.org/tactics/TA0008/"
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