Jonhnathan
4190317ec2
* [Security Content] Adjust Mitre Att&ck Mappings - Windows Rules
* Fix dates
* Fix unit test errors
* updated tags and fixed branch conflicts
updated tags and fixed branch conflicts
* description nit
* Reverting unintended changes
* Update initial_access_suspicious_ms_office_child_process.toml
---------
Co-authored-by: imays11 <59296946+imays11@users.noreply.github.com>
(cherry picked from commit f584fb6e31)
86 lines
2.8 KiB
TOML
86 lines
2.8 KiB
TOML
[metadata]
|
|
creation_date = "2020/03/25"
|
|
integration = ["endpoint", "windows"]
|
|
maturity = "production"
|
|
min_stack_comments = "Multiple field support in the New Terms rule type was added in Elastic 8.6"
|
|
min_stack_version = "8.6.0"
|
|
updated_date = "2023/10/13"
|
|
|
|
[rule]
|
|
author = ["Elastic"]
|
|
description = """
|
|
An instance of MSBuild, the Microsoft Build Engine, started a PowerShell script or the Visual C# Command Line Compiler.
|
|
This technique is sometimes used to deploy a malicious payload using the Build Engine.
|
|
"""
|
|
false_positives = [
|
|
"""
|
|
The Build Engine is commonly used by Windows developers but use by non-engineers is unusual. If a build system
|
|
triggers this rule it can be exempted by process, user or host name.
|
|
""",
|
|
]
|
|
from = "now-9m"
|
|
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
|
|
language = "kuery"
|
|
license = "Elastic License v2"
|
|
name = "Microsoft Build Engine Started an Unusual Process"
|
|
note = """## Setup
|
|
|
|
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.
|
|
"""
|
|
references = ["https://blog.talosintelligence.com/2020/02/building-bypass-with-msbuild.html"]
|
|
risk_score = 21
|
|
rule_id = "9d110cb3-5f4b-4c9a-b9f5-53f0a1707ae6"
|
|
severity = "low"
|
|
tags = ["Domain: Endpoint",
|
|
"OS: Windows",
|
|
"Use Case: Threat Detection",
|
|
"Tactic: Defense Evasion",
|
|
"Tactic: Execution",
|
|
"Data Source: Elastic Defend"
|
|
]
|
|
|
|
timestamp_override = "event.ingested"
|
|
type = "new_terms"
|
|
|
|
query = '''
|
|
host.os.type:windows and event.category:process and event.type:start and process.parent.name:"MSBuild.exe" and
|
|
process.name.caseless:("csc.exe" or "iexplore.exe" or "powershell.exe")
|
|
'''
|
|
|
|
[[rule.threat]]
|
|
framework = "MITRE ATT&CK"
|
|
|
|
[[rule.threat.technique]]
|
|
id = "T1027"
|
|
name = "Obfuscated Files or Information"
|
|
reference = "https://attack.mitre.org/techniques/T1027/"
|
|
|
|
[[rule.threat.technique.subtechnique]]
|
|
id = "T1027.004"
|
|
name = "Compile After Delivery"
|
|
reference = "https://attack.mitre.org/techniques/T1027/004/"
|
|
|
|
[[rule.threat.technique]]
|
|
id = "T1127"
|
|
name = "Trusted Developer Utilities Proxy Execution"
|
|
reference = "https://attack.mitre.org/techniques/T1127/"
|
|
[[rule.threat.technique.subtechnique]]
|
|
id = "T1127.001"
|
|
name = "MSBuild"
|
|
reference = "https://attack.mitre.org/techniques/T1127/001/"
|
|
|
|
|
|
|
|
[rule.threat.tactic]
|
|
id = "TA0005"
|
|
name = "Defense Evasion"
|
|
reference = "https://attack.mitre.org/tactics/TA0005/"
|
|
|
|
[rule.new_terms]
|
|
field = "new_terms_fields"
|
|
value = ["host.id", "user.name", "process.parent.command_line"]
|
|
|
|
[[rule.new_terms.history_window_start]]
|
|
field = "history_window_start"
|
|
value = "now-14d"
|