let Timeframe = 1h;
DeviceProcessEvents
| where Timestamp > ago(Timeframe)
| where (FileName has_any ("msbuild.exe", "msxsl.exe")
or (FileName has_any ("vbc.exe","csc.exe","jsc.exe") and ProcessCommandLine has_any ("/exe","/dll","/pe64","-exe","-dll","-pe64"))
or (FileName == ("ilsasm.exe") and ProcessCommandLine has_any ("out","target","t:","reference","r:")))
// Filter initations by Visual Studio since this is expected behavior.
and not(FolderPath startswith "C:\\Program Files (x86)\\Microsoft Visual Studio"
or InitiatingProcessFolderPath startswith "C:\\Program Files (x86)\\Microsoft Visual Studio"
and (InitiatingProcessFileName == "devenv.exe" or InitiatingProcessFileName == "WDExpress.exe"))
description: |
This detection looks at process executions - in some cases with specific command line attributes to filter a lot of common noise.
kind: Scheduled
tactics:
- DefenseEvasion
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
dataTypes:
- DeviceProcessEvents
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/TrustedDeveloperUtilitiesProxyExecution.yaml
severity: Medium
name: Trusted Developer Utilities Proxy Execution
triggerThreshold: 0
queryPeriod: 1h
query: |
let Timeframe = 1h;
DeviceProcessEvents
| where Timestamp > ago(Timeframe)
| where (FileName has_any ("msbuild.exe", "msxsl.exe")
or (FileName has_any ("vbc.exe","csc.exe","jsc.exe") and ProcessCommandLine has_any ("/exe","/dll","/pe64","-exe","-dll","-pe64"))
or (FileName == ("ilsasm.exe") and ProcessCommandLine has_any ("out","target","t:","reference","r:")))
// Filter initations by Visual Studio since this is expected behavior.
and not(FolderPath startswith "C:\\Program Files (x86)\\Microsoft Visual Studio"
or InitiatingProcessFolderPath startswith "C:\\Program Files (x86)\\Microsoft Visual Studio"
and (InitiatingProcessFileName == "devenv.exe" or InitiatingProcessFileName == "WDExpress.exe"))
relevantTechniques:
- T1127
id: 5c2bb446-926f-4160-a233-21e335c2c290
queryFrequency: 1h
status: Available
triggerOperator: gt
version: 1.0.0
entityMappings:
- entityType: Host
fieldMappings:
- columnName: DeviceName
identifier: FullName
- entityType: Account
fieldMappings:
- columnName: AccountSid
identifier: Sid
- columnName: AccountName
identifier: Name
- columnName: AccountDomain
identifier: NTDomain
- entityType: Process
fieldMappings:
- columnName: ProcessCommandLine
identifier: CommandLine
