Jonhnathan
2a3a5a250e
* [Rule Tuning] BBR Rule Tuning 1 - Tighten Indexes Edition
* Apply suggestions from code review
Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com>
* Update defense_evasion_msdt_suspicious_diagcab.toml
* Update defense_evasion_suspicious_msiexec_execution.toml
* Update discovery_security_software_wmic.toml
* Update rules_building_block/discovery_security_software_wmic.toml
Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com>
* Endgame tag
---------
Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com>
(cherry picked from commit 109e8a85a5)
56 lines
1.7 KiB
TOML
56 lines
1.7 KiB
TOML
[metadata]
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creation_date = "2023/09/27"
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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 = "2024/04/05"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies binaries that are loaded and with an invalid code signature. This may indicate an attempt to masquerade as a
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signed binary.
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"""
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from = "now-119m"
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interval = "60m"
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index = ["logs-endpoint.events.library-*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Image Loaded with Invalid Signature"
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risk_score = 21
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rule_id = "fd9484f2-1c56-44ae-8b28-dc1354e3a0e8"
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severity = "low"
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tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Rule Type: BBR", "Data Source: Elastic Defend"]
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timestamp_override = "event.ingested"
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building_block_type = "default"
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type = "eql"
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query = '''
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library where host.os.type == "windows" and event.action == "load" and
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dll.code_signature.status : ("errorUntrustedRoot", "errorBadDigest", "errorUntrustedRoot") and
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(dll.Ext.relative_file_creation_time <= 500 or dll.Ext.relative_file_name_modify_time <= 500) and
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not startswith~(dll.name, process.name) and
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not dll.path : (
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"?:\\Windows\\System32\\DriverStore\\FileRepository\\*"
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)
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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 = "T1036"
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name = "Masquerading"
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reference = "https://attack.mitre.org/techniques/T1036/"
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[[rule.threat.technique.subtechnique]]
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id = "T1036.001"
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name = "Invalid Code Signature"
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reference = "https://attack.mitre.org/techniques/T1036/001/"
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[rule.threat.tactic]
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id = "TA0005"
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name = "Defense Evasion"
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reference = "https://attack.mitre.org/tactics/TA0005/"
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