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>
46 lines
1.5 KiB
TOML
46 lines
1.5 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 = "2023/03/20"
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[rule]
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author = ["Elastic"]
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description = """
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Ransomware is a type of malware that encrypts a victim's files or systems and demands payment
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(usually in cryptocurrency) in exchange for the decryption key. One important indicator of a
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ransomware attack is the mass encryption of the file system, after which a new file extension
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is added to the file. This rule identifies a sequence of 50 file extension rename events
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by the same process in a timespan of 1 second.
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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 = 73
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rule_id = "28738f9f-7427-4d23-bc69-756708b5f624"
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severity = "high"
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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, file.extension 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 != "" ] with runs=50 | 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/" |