Multiple RDP connections from Single System
Id | 78422ef2-62bf-48ca-9bab-72c69818a425 |
Rulename | Multiple RDP connections from Single System |
Description | Identifies when an RDP connection is made to multiple systems and above the normal connection count for the previous 7 days. Connections from the same system with the same account within the same day. RDP connections are indicated by the EventID 4624 with LogonType = 10 |
Severity | Low |
Tactics | LateralMovement |
Techniques | T1021 |
Required data connectors | SecurityEvents WindowsForwardedEvents WindowsSecurityEvents |
Kind | Scheduled |
Query frequency | 1d |
Query period | 8d |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/RDP_MultipleConnectionsFromSingleSystem.yaml |
Version | 1.2.6 |
Arm template | 78422ef2-62bf-48ca-9bab-72c69818a425.json |
let endtime = 1d;
let starttime = 8d;
let threshold = 2.0;
(union isfuzzy=true
(SecurityEvent
| where TimeGenerated >= ago(endtime)
| where EventID == 4624 and LogonType == 10
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), ComputerCountToday = dcount(Computer), ComputerSet = makeset(Computer), ProcessSet = makeset(ProcessName)
by Account = tolower(Account), IpAddress, AccountType, Activity, LogonTypeName),
(WindowsEvent
| where TimeGenerated >= ago(endtime)
| where EventID == 4624
| extend LogonType = tostring(EventData.LogonType)
| where LogonType == 10
| extend ProcessName = tostring(EventData.ProcessName)
| extend Account = strcat(tostring(EventData.TargetDomainName),"\\", tostring(EventData.TargetUserName))
| extend IpAddress = tostring(EventData.IpAddress)
| extend TargetUserSid = tostring(EventData.TargetUserSid)
| extend AccountType=case(Account endswith "$" or TargetUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(TargetUserSid), "", "User")
| extend Activity="4624 - An account was successfully logged on."
| extend LogonTypeName="10 - RemoteInteractive"
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), ComputerCountToday = dcount(Computer), ComputerSet = makeset(Computer), ProcessSet = makeset(ProcessName)
by Account = tolower(Account), IpAddress, AccountType, Activity, LogonTypeName)
)
| join kind=inner (
(union isfuzzy=true
(SecurityEvent
| where TimeGenerated >= ago(starttime) and TimeGenerated < ago(endtime)
| where EventID == 4624 and LogonType == 10
| summarize ComputerCountPrev7Days = dcount(Computer) by Account = tolower(Account), IpAddress
),
( WindowsEvent
| where TimeGenerated >= ago(starttime) and TimeGenerated < ago(endtime)
| where EventID == 4624 and EventData has ("10")
| extend LogonType = toint(EventData.LogonType)
| where LogonType == 10
| extend Account = strcat(tostring(EventData.TargetDomainName),"\\", tostring(EventData.TargetUserName))
| extend IpAddress = tostring(EventData.IpAddress)
| summarize ComputerCountPrev7Days = dcount(Computer) by Account = tolower(Account), IpAddress)
)
) on Account, IpAddress
| extend Ratio = iff(isempty(ComputerCountPrev7Days), toreal(ComputerCountToday), ComputerCountToday / (ComputerCountPrev7Days * 1.0))
// Where the ratio of today to previous 7 days is more than double.
| where Ratio > threshold
| project StartTime, EndTime, Account, IpAddress, ComputerSet, ComputerCountToday, ComputerCountPrev7Days, Ratio, AccountType, Activity, LogonTypeName, ProcessSet
| extend AccountName = tostring(split(Account, @"\")[1]), AccountNTDomain = tostring(split(Account, @"\")[0])
description: |
'Identifies when an RDP connection is made to multiple systems and above the normal connection count for the previous 7 days.
Connections from the same system with the same account within the same day.
RDP connections are indicated by the EventID 4624 with LogonType = 10'
queryPeriod: 8d
name: Multiple RDP connections from Single System
triggerThreshold: 0
tactics:
- LateralMovement
severity: Low
kind: Scheduled
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: Account
- identifier: Name
columnName: AccountName
- identifier: NTDomain
columnName: AccountNTDomain
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IpAddress
queryFrequency: 1d
triggerOperator: gt
id: 78422ef2-62bf-48ca-9bab-72c69818a425
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/RDP_MultipleConnectionsFromSingleSystem.yaml
version: 1.2.6
query: |
let endtime = 1d;
let starttime = 8d;
let threshold = 2.0;
(union isfuzzy=true
(SecurityEvent
| where TimeGenerated >= ago(endtime)
| where EventID == 4624 and LogonType == 10
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), ComputerCountToday = dcount(Computer), ComputerSet = makeset(Computer), ProcessSet = makeset(ProcessName)
by Account = tolower(Account), IpAddress, AccountType, Activity, LogonTypeName),
(WindowsEvent
| where TimeGenerated >= ago(endtime)
| where EventID == 4624
| extend LogonType = tostring(EventData.LogonType)
| where LogonType == 10
| extend ProcessName = tostring(EventData.ProcessName)
| extend Account = strcat(tostring(EventData.TargetDomainName),"\\", tostring(EventData.TargetUserName))
| extend IpAddress = tostring(EventData.IpAddress)
| extend TargetUserSid = tostring(EventData.TargetUserSid)
| extend AccountType=case(Account endswith "$" or TargetUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(TargetUserSid), "", "User")
| extend Activity="4624 - An account was successfully logged on."
| extend LogonTypeName="10 - RemoteInteractive"
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), ComputerCountToday = dcount(Computer), ComputerSet = makeset(Computer), ProcessSet = makeset(ProcessName)
by Account = tolower(Account), IpAddress, AccountType, Activity, LogonTypeName)
)
| join kind=inner (
(union isfuzzy=true
(SecurityEvent
| where TimeGenerated >= ago(starttime) and TimeGenerated < ago(endtime)
| where EventID == 4624 and LogonType == 10
| summarize ComputerCountPrev7Days = dcount(Computer) by Account = tolower(Account), IpAddress
),
( WindowsEvent
| where TimeGenerated >= ago(starttime) and TimeGenerated < ago(endtime)
| where EventID == 4624 and EventData has ("10")
| extend LogonType = toint(EventData.LogonType)
| where LogonType == 10
| extend Account = strcat(tostring(EventData.TargetDomainName),"\\", tostring(EventData.TargetUserName))
| extend IpAddress = tostring(EventData.IpAddress)
| summarize ComputerCountPrev7Days = dcount(Computer) by Account = tolower(Account), IpAddress)
)
) on Account, IpAddress
| extend Ratio = iff(isempty(ComputerCountPrev7Days), toreal(ComputerCountToday), ComputerCountToday / (ComputerCountPrev7Days * 1.0))
// Where the ratio of today to previous 7 days is more than double.
| where Ratio > threshold
| project StartTime, EndTime, Account, IpAddress, ComputerSet, ComputerCountToday, ComputerCountPrev7Days, Ratio, AccountType, Activity, LogonTypeName, ProcessSet
| extend AccountName = tostring(split(Account, @"\")[1]), AccountNTDomain = tostring(split(Account, @"\")[0])
requiredDataConnectors:
- connectorId: SecurityEvents
dataTypes:
- SecurityEvent
- connectorId: WindowsSecurityEvents
dataTypes:
- SecurityEvent
- connectorId: WindowsForwardedEvents
dataTypes:
- WindowsEvent
relevantTechniques:
- T1021
metadata:
categories:
domains:
- Security - Threat Protection
author:
name: Microsoft Security Research
source:
kind: Community
support:
tier: Community
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/78422ef2-62bf-48ca-9bab-72c69818a425')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/78422ef2-62bf-48ca-9bab-72c69818a425')]",
"properties": {
"alertRuleTemplateName": "78422ef2-62bf-48ca-9bab-72c69818a425",
"customDetails": null,
"description": "'Identifies when an RDP connection is made to multiple systems and above the normal connection count for the previous 7 days.\nConnections from the same system with the same account within the same day.\nRDP connections are indicated by the EventID 4624 with LogonType = 10'\n",
"displayName": "Multiple RDP connections from Single System",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "Account",
"identifier": "FullName"
},
{
"columnName": "AccountName",
"identifier": "Name"
},
{
"columnName": "AccountNTDomain",
"identifier": "NTDomain"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IpAddress",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/RDP_MultipleConnectionsFromSingleSystem.yaml",
"query": "let endtime = 1d;\nlet starttime = 8d;\nlet threshold = 2.0;\n(union isfuzzy=true\n(SecurityEvent\n| where TimeGenerated >= ago(endtime)\n| where EventID == 4624 and LogonType == 10\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), ComputerCountToday = dcount(Computer), ComputerSet = makeset(Computer), ProcessSet = makeset(ProcessName)\nby Account = tolower(Account), IpAddress, AccountType, Activity, LogonTypeName),\n(WindowsEvent\n| where TimeGenerated >= ago(endtime)\n| where EventID == 4624\n| extend LogonType = tostring(EventData.LogonType)\n| where LogonType == 10\n| extend ProcessName = tostring(EventData.ProcessName)\n| extend Account = strcat(tostring(EventData.TargetDomainName),\"\\\\\", tostring(EventData.TargetUserName))\n| extend IpAddress = tostring(EventData.IpAddress)\n| extend TargetUserSid = tostring(EventData.TargetUserSid)\n| extend AccountType=case(Account endswith \"$\" or TargetUserSid in (\"S-1-5-18\", \"S-1-5-19\", \"S-1-5-20\"), \"Machine\", isempty(TargetUserSid), \"\", \"User\")\n| extend Activity=\"4624 - An account was successfully logged on.\"\n| extend LogonTypeName=\"10 - RemoteInteractive\"\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), ComputerCountToday = dcount(Computer), ComputerSet = makeset(Computer), ProcessSet = makeset(ProcessName)\nby Account = tolower(Account), IpAddress, AccountType, Activity, LogonTypeName)\n)\n| join kind=inner (\n(union isfuzzy=true\n(SecurityEvent\n| where TimeGenerated >= ago(starttime) and TimeGenerated < ago(endtime)\n| where EventID == 4624 and LogonType == 10\n| summarize ComputerCountPrev7Days = dcount(Computer) by Account = tolower(Account), IpAddress\n),\n( WindowsEvent\n| where TimeGenerated >= ago(starttime) and TimeGenerated < ago(endtime)\n| where EventID == 4624 and EventData has (\"10\")\n| extend LogonType = toint(EventData.LogonType)\n| where LogonType == 10\n| extend Account = strcat(tostring(EventData.TargetDomainName),\"\\\\\", tostring(EventData.TargetUserName))\n| extend IpAddress = tostring(EventData.IpAddress)\n| summarize ComputerCountPrev7Days = dcount(Computer) by Account = tolower(Account), IpAddress)\n)\n) on Account, IpAddress\n| extend Ratio = iff(isempty(ComputerCountPrev7Days), toreal(ComputerCountToday), ComputerCountToday / (ComputerCountPrev7Days * 1.0))\n// Where the ratio of today to previous 7 days is more than double.\n| where Ratio > threshold\n| project StartTime, EndTime, Account, IpAddress, ComputerSet, ComputerCountToday, ComputerCountPrev7Days, Ratio, AccountType, Activity, LogonTypeName, ProcessSet\n| extend AccountName = tostring(split(Account, @\"\\\")[1]), AccountNTDomain = tostring(split(Account, @\"\\\")[0])\n",
"queryFrequency": "P1D",
"queryPeriod": "P8D",
"severity": "Low",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"LateralMovement"
],
"techniques": [
"T1021"
],
"templateVersion": "1.2.6",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}