56 lines
2.5 KiB
TOML
56 lines
2.5 KiB
TOML
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[metadata]
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creation_date = "2023/08/23"
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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 = "2023/08/23"
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[rule]
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author = ["Elastic"]
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description = """
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This rule monitors for common command line flags leveraged by the Chisel server utility followed by a received connection
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within a timespan of 1 minute. Chisel is a command-line utility used for creating and managing TCP and UDP tunnels,
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enabling port forwarding and secure communication between machines. Attackers can abuse the Chisel utility to establish
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covert communication channels, bypass network restrictions, and carry out malicious activities by creating tunnels that
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allow unauthorized access to internal systems.
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"""
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from = "now-9m"
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index = ["logs-endpoint.events.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Potential Protocol Tunneling via Chisel Server"
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references = [
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"https://blog.bitsadmin.com/living-off-the-foreign-land-windows-as-offensive-platform",
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"https://book.hacktricks.xyz/generic-methodologies-and-resources/tunneling-and-port-forwarding"
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]
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risk_score = 47
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rule_id = "ac8805f6-1e08-406c-962e-3937057fa86f"
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severity = "medium"
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tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Command and Control", "Data Source: Elastic Defend"]
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type = "eql"
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query = '''
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sequence by host.id, process.entity_id with maxspan=1m
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[process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and
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process.args == "server" and process.args in ("--port", "-p", "--reverse", "--backend", "--socks5") and
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process.args_count >= 3 and process.parent.name in ("bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")]
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[network where host.os.type == "linux" and event.action == "connection_accepted" and event.type == "start" and
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destination.ip != null and destination.ip != "127.0.0.1" and destination.ip != "::1" and
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not process.name : (
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"python*", "php*", "perl", "ruby", "lua*", "openssl", "nc", "netcat", "ncat", "telnet", "awk", "java", "telnet",
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"ftp", "socat", "curl", "wget", "dpkg", "docker", "dockerd", "yum", "apt", "rpm", "dnf", "ssh", "sshd", "hugo")]
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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 = "T1572"
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name = "Protocol Tunneling"
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reference = "https://attack.mitre.org/techniques/T1572/"
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[rule.threat.tactic]
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id = "TA0011"
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name = "Command and Control"
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reference = "https://attack.mitre.org/tactics/TA0011/"
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