Ruben Groenewoud
a7ff449fbc
* [Rule Tuning] Doing some quick tunings * updated_date bump * Update rules/linux/discovery_linux_modprobe_enumeration.toml * Update rules/linux/discovery_linux_modprobe_enumeration.toml * Update rules/linux/discovery_linux_sysctl_enumeration.toml * Update rules/linux/persistence_init_d_file_creation.toml * Update rules/linux/persistence_rc_script_creation.toml * Update rules/linux/persistence_shared_object_creation.toml * deprecate rule * deprecate rule * Update execution_abnormal_process_id_file_created.toml * Update discovery_kernel_module_enumeration_via_proc.toml * Update discovery_linux_modprobe_enumeration.toml * Update execution_remote_code_execution_via_postgresql.toml * Update discovery_potential_syn_port_scan_detected.toml * Added 2 tunings, sorry I missed those.. * One more tune * Update discovery_suspicious_proc_enumeration.toml
56 lines
2.1 KiB
TOML
56 lines
2.1 KiB
TOML
[metadata]
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creation_date = "2023/03/20"
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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 = "2023/08/02"
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[rule]
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author = ["Elastic"]
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description = """
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This rule identifies a sequence of 100 file extension rename events within a set of common file paths by the same
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process in a timespan of 1 second. Ransomware is a type of malware that encrypts a victim's files or systems and
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demands payment (usually in cryptocurrency) in exchange for the decryption key. One important indicator of a ransomware
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attack is the mass encryption of the file system, after which a new file extension is added to the file.
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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 = "Suspicious File Changes Activity Detected"
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risk_score = 47
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rule_id = "28738f9f-7427-4d23-bc69-756708b5f624"
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severity = "medium"
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tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Impact"]
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type = "eql"
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query = '''
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sequence by host.id, process.entity_id with maxspan=1s
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[ file where host.os.type == "linux" and event.type == "change" and
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event.action == "rename" and file.extension != "" and
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file.path : (
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"/home/*", "/etc/*", "/root/*", "/opt/*", "/var/backups/*", "/var/lib/log/*"
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) and not
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file.extension : (
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"xml", "json", "conf", "dat", "gz", "info", "mod", "final",
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"php", "pyc", "log", "bak", "bin", "csv", "pdf", "cfg", "*old"
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) and not
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process.name : (
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"dpkg", "yum", "dnf", "rpm", "dockerd", "go", "java", "pip*", "python*", "node", "containerd", "php", "p4d",
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"conda", "chrome", "imap", "cmake", "firefox", "semanage", "semodule", "ansible-galaxy"
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) ] with runs=100 | tail 1
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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 = "T1486"
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name = "Data Encrypted for Impact"
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reference = "https://attack.mitre.org/techniques/T1486/"
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[rule.threat.tactic]
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id = "TA0040"
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name = "Impact"
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reference = "https://attack.mitre.org/tactics/TA0040/"
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