Ruben Groenewoud
020fff3aea
* [Rule Tuning] [WIP] Linux DR * Update defense_evasion_binary_copied_to_suspicious_directory.toml * Fixed tag * Added additional tuning * unit test fix * Additional tuning * tuning * added max signals * Added max_signals=1 to brute force rules * Cross-Platform Tuning * Small fix * new_terms conversion * typo * new_terms conversion * Ransomware rule tuning * performance tuning * new_terms conversion for auditd_manager * tune * Need coffee * kql/eql stuff * formatting improvement * new_terms sudo hijacking conversion * exclusion * Deprecations that were added last tuning * Deprecations that were added last tuning * Increased max timespan for brute force rules * version bump * added domain tag * Two tunings * More tuning * Additional tuning * updated_date bump * query optimization * Tuning * Readded the exclusions for this one * Changed int comparison * Some tunings * Update persistence_systemd_scheduled_timer_created.toml * Update rules/linux/privilege_escalation_ld_preload_shared_object_modif.toml Co-authored-by: Isai <59296946+imays11@users.noreply.github.com> * [New Rule] Potential curl CVE-2023-38545 Exploitation * Revert "[New Rule] Potential curl CVE-2023-38545 Exploitation" This reverts commit 9c04d1b53d3d63678289f43ec0c7b617d26f1ce0. * Update rules/cross-platform/command_and_control_non_standard_ssh_port.toml * Update rules/linux/command_and_control_cat_network_activity.toml * Update persistence_message_of_the_day_execution.toml * Changed max_signals * Revert "Merge branch 'main' into rule-tuning-ongoing-dr" This reverts commit 1106b5d2eba1a3529eff325226d6baabfd4b0bf3, reversing changes made to 5ff510757f25b0cb32e1ef18e9e2c34c8ec325a8. * Revertable merge * Update defense_evasion_ld_preload_env_variable_process_injection.toml * File name change --------- Co-authored-by: Isai <59296946+imays11@users.noreply.github.com> Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
105 lines
3.0 KiB
TOML
105 lines
3.0 KiB
TOML
[metadata]
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creation_date = "2020/12/22"
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integration = ["endpoint"]
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maturity = "production"
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min_stack_comments = "Multiple field support in the New Terms rule type was added in Elastic 8.6"
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min_stack_version = "8.6.0"
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updated_date = "2023/09/22"
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[rule]
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author = ["Elastic"]
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description = """
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The Secure Shell (SSH) authorized_keys file specifies which users are allowed to log into a server using public key
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authentication. Adversaries may modify it to maintain persistence on a victim host by adding their own public key(s).
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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 = "kuery"
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license = "Elastic License v2"
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name = "SSH Authorized Keys File Modification"
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risk_score = 47
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rule_id = "2215b8bd-1759-4ffa-8ab8-55c8e6b32e7f"
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severity = "medium"
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tags = ["Domain: Endpoint",
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"OS: Linux",
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"OS: macOS",
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"Use Case: Threat Detection",
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"Tactic: Lateral Movement",
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"Tactic: Persistence",
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"Data Source: Elastic Defend"
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]
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timestamp_override = "event.ingested"
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type = "new_terms"
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query = '''
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event.category:file and event.type:(change or creation) and
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file.name:("authorized_keys" or "authorized_keys2" or "/etc/ssh/sshd_config" or "/root/.ssh") and
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not process.executable:
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(/Library/Developer/CommandLineTools/usr/bin/git or
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/usr/local/Cellar/maven/*/libexec/bin/mvn or
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/Library/Java/JavaVirtualMachines/jdk*.jdk/Contents/Home/bin/java or
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/usr/bin/vim or
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/usr/local/Cellar/coreutils/*/bin/gcat or
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/usr/bin/bsdtar or
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/usr/bin/nautilus or
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/usr/bin/scp or
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/usr/bin/touch or
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/var/lib/docker/* or
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/usr/bin/google_guest_agent or
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/opt/jc/bin/jumpcloud-agent)
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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 = "T1098"
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name = "Account Manipulation"
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reference = "https://attack.mitre.org/techniques/T1098/"
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[[rule.threat.technique.subtechnique]]
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id = "T1098.004"
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name = "SSH Authorized Keys"
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reference = "https://attack.mitre.org/techniques/T1098/004/"
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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 = "T1563"
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name = "Remote Service Session Hijacking"
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reference = "https://attack.mitre.org/techniques/T1563/"
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[[rule.threat.technique.subtechnique]]
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id = "T1563.001"
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name = "SSH Hijacking"
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reference = "https://attack.mitre.org/techniques/T1563/001/"
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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.technique.subtechnique]]
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id = "T1021.004"
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name = "SSH"
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reference = "https://attack.mitre.org/techniques/T1021/004/"
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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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[rule.new_terms]
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field = "new_terms_fields"
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value = ["host.id", "process.executable", "file.path"]
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[[rule.new_terms.history_window_start]]
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field = "history_window_start"
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value = "now-7d"
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