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[Tuning] Top Noisy Windows BBR (#5480)

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* [Tuning] Top Noisy Windows BBRS

- Process Discovery Using Built-in Tools
- System Service Discovery through built-in Windows Utilities

* Update discovery_generic_process_discovery.toml

* Update discovery_generic_process_discovery.toml

* Update discovery_generic_process_discovery.toml

* Update discovery_generic_process_discovery.toml

---------

Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
This commit is contained in:
Samirbous
2025-12-18 16:01:58 +00:00
committed by GitHub
parent b996a29451
commit f9ba8a8f71
2 changed files with 37 additions and 16 deletions
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rules_building_block/discovery_generic_process_discovery.toml
+15 -10
View File
@@ -3,7 +3,7 @@ bypass_bbr_timing = true
creation_date = "2023/07/13"
integration = ["endpoint", "windows", "system"]
maturity = "production"
updated_date = "2025/03/20"
updated_date = "2025/12/17"
[rule]
author = ["Elastic"]
@@ -14,7 +14,6 @@ enumerate processes to identify installed applications and security solutions.
"""
from = "now-9m"
index = [
"endgame-*",
"logs-endpoint.events.process-*",
"logs-system.security*",
"logs-windows.*",
@@ -33,21 +32,27 @@ tags = [
"Tactic: Discovery",
"Rule Type: BBR",
"Data Source: Elastic Defend",
"Data Source: Elastic Endgame",
"Data Source: Windows Security Event Logs",
]
timestamp_override = "event.ingested"
type = "eql"
query = '''
process where host.os.type == "windows" and event.type == "start" and process.args != null and
process where host.os.type == "windows" and event.type == "start" and process.args != null and
not user.id in ("S-1-5-18", "S-1-5-19", "S-1-5-20") and process.parent.executable != null and
(
process.name :("PsList.exe", "qprocess.exe") or
(process.name : "powershell.exe" and process.args : ("*get-process*", "*Win32_Process*")) or
(process.name : "wmic.exe" and process.args : ("process", "*Win32_Process*")) or
(process.name : "tasklist.exe" and not process.args : ("pid eq*")) or
(process.name : "query.exe" and process.args : "process")
) and not user.id : "S-1-5-18"
process.name :("PsList.exe", "qprocess.exe") or
(process.name : "powershell.exe" and process.args : ("*get-process*", "*Win32_Process*") and not process.parent.name in ("openaev-agent.exe", "cmd.exe", "Miro.exe", "Granola.exe", "Wispr Flow.exe")) or
(process.name : "wmic.exe" and process.args : ("process", "*Win32_Process*") and not process.parent.name in ("Code.exe", "node.exe", "javaw.exe", "java.exe", "asus_framework.exe", "Evernote.exe", "RingCentral.exe", "Avaya Cloud.exe", "Arduino IDE.exe")) or
(process.name : "tasklist.exe" and process.args_count == 1 and process.parent.args != "tasklist | findstr consent.exe") or
(process.name : "query.exe" and process.args : ("process", "imagename*", "csv", "/fi"))
) and
not process.working_directory like ("?:\\Program Files*", "D:\\*", "E:\\*") and
not process.parent.executable like ("?:\\Program Files (x86)\\*.exe", "?:\\Program Files\\*.exe")
'''
rules_building_block/discovery_system_service_discovery.toml
+22 -6
View File
@@ -3,7 +3,7 @@ bypass_bbr_timing = true
creation_date = "2023/01/24"
integration = ["windows", "endpoint", "system"]
maturity = "production"
updated_date = "2025/03/20"
updated_date = "2025/12/17"
[rule]
author = ["Elastic"]
@@ -41,14 +41,30 @@ timestamp_override = "event.ingested"
type = "eql"
query = '''
process where host.os.type == "windows" and event.type == "start" and
process where host.os.type == "windows" and event.type == "start" and process.parent.executable != null and
(
((process.name: "net.exe" or process.pe.original_file_name == "net.exe" or (process.name : "net1.exe" and
not process.parent.name : "net.exe")) and process.args : ("start", "use") and process.args_count == 2) or
((process.name: "sc.exe" or process.pe.original_file_name == "sc.exe") and process.args: ("query", "q*")) or
((process.name: "tasklist.exe" or process.pe.original_file_name == "tasklist.exe") and process.args: "/svc") or
not process.parent.name : "net.exe")) and process.args : ("start", "use") and process.args_count == 2 and
not process.parent.args : ("*.bat", "*netlogon*", "\\\\*")) or
((process.name: "sc.exe" or process.pe.original_file_name == "sc.exe") and process.args: ("query", "q*") and not process.parent.args : "*.bat") or
((process.name: "tasklist.exe" or process.pe.original_file_name == "tasklist.exe") and process.args: "/svc" and not process.command_line : "*\\Windows\\TEMP\\nessus_task_list*") or
(process.name : "psservice.exe" or process.pe.original_file_name == "psservice.exe")
) and not user.id : "S-1-5-18"
) and
not user.id in ("S-1-5-18", "S-1-5-19", "S-1-5-20") and
not process.parent.executable in
("C:\\Program Files\\AzureConnectedMachineAgent\\himds.exe",
"C:\\Program Files\\AzureConnectedMachineAgent\\azcmagent.exe",
"C:\\Program Files\\Varian\\DICOMServices\\VMS.DICOMServices.ServiceFW.GenericControlledServiceHost.exe",
"C:\\Senior\\HCM\\jdk-11.0.2\\bin\\java.exe",
"D:\\biomerieux\\programs\\ServiceMonitor\\bin\\MylaServiceMonitor.exe",
"C:\\ViewPowerPro\\openJDK\\bin\\javaw.exe",
"C:\\ServiceNow MID Server mid-server-autosports-prod\\agent\\jre\\bin\\java.exe") and
not process.command_line in ("sc queryex SCardSvr",
"sc query \"Axway_Integrator\" ",
"sc query \"Delta enteliVAULT PostgreSQL\" ",
"sc query \"WERMA-WIN-Connector\" ",
"sc query _EWSSynchronizationServer_JDE ",
"sc query SchneiderUPSMySQL")
'''