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"))
name: Trusted Developer Utilities Proxy Execution
relevantTechniques:
- T1127
id: 5c2bb446-926f-4160-a233-21e335c2c290
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/TrustedDeveloperUtilitiesProxyExecution.yaml
requiredDataConnectors:
- dataTypes:
- DeviceProcessEvents
connectorId: MicrosoftThreatProtection
version: 1.0.0
severity: Medium
triggerThreshold: 0
queryPeriod: 1h
entityMappings:
- fieldMappings:
- identifier: FullName
columnName: DeviceName
entityType: Host
- fieldMappings:
- identifier: Sid
columnName: AccountSid
- identifier: Name
columnName: AccountName
- identifier: NTDomain
columnName: AccountDomain
entityType: Account
- fieldMappings:
- identifier: CommandLine
columnName: ProcessCommandLine
entityType: Process
queryFrequency: 1h
status: Available
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"))
tactics:
- DefenseEvasion
kind: Scheduled
description: |
This detection looks at process executions - in some cases with specific command line attributes to filter a lot of common noise.
triggerOperator: gt
