Ruben Groenewoud
f66b82c0ec
* Update defense_evasion_execution_msbuild_started_by_script.toml
* Mostly updated Execution tags, also new_terms conv
* removed index
* Removed index
* WMIPrvSE tuning
* Additional tuning
* Tuning & changes
* Additional tuning
* Applied unit test optimization
* Addressed feedback
* Update rules/windows/execution_command_shell_started_by_svchost.toml
Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
* caseless unit testing fix
* fixed caseless executable unit test
* unit testing fix
* Update rules/windows/execution_suspicious_powershell_imgload.toml
Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com>
* Update execution_ms_office_written_file.toml
* Update rules/windows/defense_evasion_execution_msbuild_started_by_script.toml
* Update rules/windows/defense_evasion_execution_msbuild_started_unusal_process.toml
* Added user ids to new terms
* Update rules/windows/execution_suspicious_powershell_imgload.toml
Co-authored-by: Justin Ibarra <16747370+brokensound77@users.noreply.github.com>
* Update rules_building_block/execution_unsigned_service_executable.toml
Co-authored-by: Justin Ibarra <16747370+brokensound77@users.noreply.github.com>
* Update execution_unsigned_service_executable.toml
---------
Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com>
Co-authored-by: Justin Ibarra <16747370+brokensound77@users.noreply.github.com>
(cherry picked from commit c2822e175c)
73 lines
2.2 KiB
TOML
Executable File
73 lines
2.2 KiB
TOML
Executable File
[metadata]
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creation_date = "2020/03/25"
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integration = ["endpoint", "windows"]
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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 = "2023/09/19"
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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, was started by a script or the Windows command interpreter. This
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behavior is unusual and is sometimes used by malicious payloads.
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"""
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false_positives = ["The Build Engine is commonly used by Windows developers but use by non-engineers is unusual."]
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from = "now-9m"
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index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
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language = "kuery"
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license = "Elastic License v2"
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name = "Microsoft Build Engine Started by a Script Process"
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risk_score = 21
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rule_id = "9d110cb3-5f4b-4c9a-b9f5-53f0a1707ae2"
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severity = "low"
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tags = ["Domain: Endpoint",
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"OS: Windows",
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"Use Case: Threat Detection",
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"Tactic: Defense Evasion",
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"Tactic: Execution",
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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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host.os.type:windows and event.category:process and event.type:start and (
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process.name.caseless:"msbuild.exe" or process.pe.original_file_name:"MSBuild.exe") and
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process.parent.name:("cmd.exe" or "powershell.exe" or "pwsh.exe" or "powershell_ise.exe" or "cscript.exe" or
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"wscript.exe" or "mshta.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 = "T1127"
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name = "Trusted Developer Utilities Proxy Execution"
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reference = "https://attack.mitre.org/techniques/T1127/"
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[[rule.threat.technique.subtechnique]]
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id = "T1127.001"
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name = "MSBuild"
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reference = "https://attack.mitre.org/techniques/T1127/001/"
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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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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[rule.threat.tactic]
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id = "TA0002"
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name = "Execution"
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reference = "https://attack.mitre.org/tactics/TA0002/"
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[rule.new_terms]
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field = "new_terms_fields"
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value = ["host.id", "user.name", "process.command_line"]
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[[rule.new_terms.history_window_start]]
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field = "history_window_start"
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value = "now-14d"
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