Justin Ibarra
eeb8ab7744
* Expand timestamp_override tests
* removed timestamp_override from eql sequence rules
* add config entry for eql rules with beats index and t_o
* add timestamp_override to missing fields
Removed changes from:
- rules/cross-platform/impact_hosts_file_modified.toml
- rules/windows/credential_access_lsass_memdump_file_created.toml
- rules/windows/defense_evasion_adding_the_hidden_file_attribute_with_via_attribexe.toml
- rules/windows/defense_evasion_execution_lolbas_wuauclt.toml
- rules/windows/defense_evasion_suspicious_certutil_commands.toml
- rules/windows/execution_command_shell_started_by_svchost.toml
(selectively cherry picked from commit 6bdfddac8e)
60 lines
2.0 KiB
TOML
Executable File
60 lines
2.0 KiB
TOML
Executable File
[metadata]
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creation_date = "2020/03/25"
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maturity = "production"
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updated_date = "2022/03/31"
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[rule]
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author = ["Elastic"]
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description = """
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An instance of MSBuild, the Microsoft Build Engine, started a PowerShell script or the Visual C# Command Line Compiler.
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This technique is sometimes used to deploy a malicious payload using the Build Engine.
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"""
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false_positives = [
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"""
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The Build Engine is commonly used by Windows developers but use by non-engineers is unusual. If a build system
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triggers this rule it can be exempted by process, user or host name.
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""",
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]
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from = "now-9m"
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index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Microsoft Build Engine Started an Unusual Process"
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note = """## Config
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If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
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"""
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references = ["https://blog.talosintelligence.com/2020/02/building-bypass-with-msbuild.html"]
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risk_score = 21
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rule_id = "9d110cb3-5f4b-4c9a-b9f5-53f0a1707ae6"
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severity = "low"
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tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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process where event.type in ("start", "process_started") and
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process.parent.name : "MSBuild.exe" and
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process.name : ("csc.exe", "iexplore.exe", "powershell.exe")
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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 = "T1027"
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name = "Obfuscated Files or Information"
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reference = "https://attack.mitre.org/techniques/T1027/"
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[[rule.threat.technique.subtechnique]]
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id = "T1027.004"
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name = "Compile After Delivery"
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reference = "https://attack.mitre.org/techniques/T1027/004/"
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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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