Justin Ibarra
59da2da474
* add unit tests to ensure host type and platform are included * add host.os.name 'linux' to all linux rules * add host.os.name macos to mac rules * add host.os.name to windows rules; fix linux dates * update from host.os.name to host.os.type Co-authored-by: brokensound77 <brokensound77@users.noreply.github.com> Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
63 lines
2.2 KiB
TOML
63 lines
2.2 KiB
TOML
[metadata]
|
|
creation_date = "2020/03/25"
|
|
integration = ["endpoint", "windows"]
|
|
maturity = "production"
|
|
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
|
|
min_stack_version = "8.3.0"
|
|
updated_date = "2023/02/22"
|
|
|
|
[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.*", "endgame-*"]
|
|
language = "eql"
|
|
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 = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion", "Elastic Endgame"]
|
|
timestamp_override = "event.ingested"
|
|
type = "eql"
|
|
|
|
query = '''
|
|
process where host.os.type == "windows" and event.type == "start" and
|
|
process.parent.name : "MSBuild.exe" and
|
|
process.name : ("csc.exe", "iexplore.exe", "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.tactic]
|
|
id = "TA0005"
|
|
name = "Defense Evasion"
|
|
reference = "https://attack.mitre.org/tactics/TA0005/"
|
|
|