let executions = DeviceProcessEvents
| where InitiatingProcessFileName contains "taskmgr" and AccountName !contains "_ladm" // Include your LAPS /RID500 admin naming convention here.
// Add the below filter to look for stock SharpRDP behavior. However, with minorchanges to the stock version of SharpRDP the filter below can be bypassed.
//| where not(InitiatingProcessCommandLine has_any ("/1","/2","/3","/4"))
| where not(FolderPath =~ @"c:\Windows\system32\WerFault.exe" and ProcessCommandLine contains "-u -p")
| where not(FolderPath =~ @"c:\windows\system32\mmc.exe" and ProcessCommandLine contains @"C:\WINDOWS\System32\services.msc")
| where not(FolderPath =~ @"c:\windows\system32\resmon.exe");
executions
| join kind=leftsemi (DeviceLogonEvents
| where LogonType in ('Unlock', 'RemoteInteractive') and not (LogonType == 'Unlock' and RemoteIP == '127.0.0.1') and RemoteIP != "" and ActionType == "LogonSuccess") on DeviceId, LogonId
triggerThreshold: 0
triggerOperator: gt
description: |
This detection monitors for the behavior that SharpRDP exhibits on the target system. The most relevant is leveraging taskmgr.exe to gain elevated execution, which means that taskmgr.exe is creating unexpected child processes.
relevantTechniques:
- T1021.001
query: |
let executions = DeviceProcessEvents
| where InitiatingProcessFileName contains "taskmgr" and AccountName !contains "_ladm" // Include your LAPS /RID500 admin naming convention here.
// Add the below filter to look for stock SharpRDP behavior. However, with minorchanges to the stock version of SharpRDP the filter below can be bypassed.
//| where not(InitiatingProcessCommandLine has_any ("/1","/2","/3","/4"))
| where not(FolderPath =~ @"c:\Windows\system32\WerFault.exe" and ProcessCommandLine contains "-u -p")
| where not(FolderPath =~ @"c:\windows\system32\mmc.exe" and ProcessCommandLine contains @"C:\WINDOWS\System32\services.msc")
| where not(FolderPath =~ @"c:\windows\system32\resmon.exe");
executions
| join kind=leftsemi (DeviceLogonEvents
| where LogonType in ('Unlock', 'RemoteInteractive') and not (LogonType == 'Unlock' and RemoteIP == '127.0.0.1') and RemoteIP != "" and ActionType == "LogonSuccess") on DeviceId, LogonId
status: Available
requiredDataConnectors:
- dataTypes:
- DeviceProcessEvents
- DeviceLogonEvents
connectorId: MicrosoftThreatProtection
kind: Scheduled
tactics:
- LateralMovement
queryFrequency: 1h
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
severity: Medium
name: Remote Desktop Protocol - SharpRDP
queryPeriod: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/RemoteDesktopProtocol.yaml
id: cc46e76c-0d04-40b0-9c8b-929aa40513e7
version: 1.0.0
