Network endpoint to host executable correlation

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Id	01f64465-b1ef-41ea-a7f5-31553a11ad43
Rulename	Network endpoint to host executable correlation
Description	Correlates blocked URLs hosting [malicious] executables with host endpoint data to identify potential instances of executables of the same name having been recently run.
Severity	Medium
Tactics	Execution
Techniques	T1204
Required data connectors	SecurityEvents TrendMicro WindowsForwardedEvents WindowsSecurityEvents
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Threat Protection Essentials/Analytic Rules/NetworkEndpointCorrelation.yaml
Version	1.1.6
Arm template	01f64465-b1ef-41ea-a7f5-31553a11ad43.json

KQL

let endpointData = 
(union isfuzzy=true
(SecurityEvent
  | where EventID == 4688
  | extend shortFileName = tolower(tostring(split(NewProcessName, '\\')[-1]))
  ),
  (WindowsEvent
  | where EventID == 4688
  | extend  NewProcessName = tostring(EventData.NewProcessName)
  | extend shortFileName = tolower(tostring(split(NewProcessName, '\\')[-1]))
  | extend TargetUserName = tostring(EventData.TargetUserName)
  ));
// Correlate suspect executables seen in TrendMicro rule updates with similar activity on endpoints
CommonSecurityLog
| where DeviceVendor =~ "Trend Micro"
| where Activity =~ "Deny List updated" 
| where RequestURL endswith ".exe"
| project TimeGenerated, Activity , RequestURL , SourceIP, DestinationIP
| extend suspectExeName = tolower(tostring(split(RequestURL, '/')[-1]))
| join kind=innerunique (endpointData) on $left.suspectExeName == $right.shortFileName 
| extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))

YAML

queryPeriod: 1d
query: |
  let endpointData = 
  (union isfuzzy=true
  (SecurityEvent
    | where EventID == 4688
    | extend shortFileName = tolower(tostring(split(NewProcessName, '\\')[-1]))
    ),
    (WindowsEvent
    | where EventID == 4688
    | extend  NewProcessName = tostring(EventData.NewProcessName)
    | extend shortFileName = tolower(tostring(split(NewProcessName, '\\')[-1]))
    | extend TargetUserName = tostring(EventData.TargetUserName)
    ));
  // Correlate suspect executables seen in TrendMicro rule updates with similar activity on endpoints
  CommonSecurityLog
  | where DeviceVendor =~ "Trend Micro"
  | where Activity =~ "Deny List updated" 
  | where RequestURL endswith ".exe"
  | project TimeGenerated, Activity , RequestURL , SourceIP, DestinationIP
  | extend suspectExeName = tolower(tostring(split(RequestURL, '/')[-1]))
  | join kind=innerunique (endpointData) on $left.suspectExeName == $right.shortFileName 
  | extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))  
name: Network endpoint to host executable correlation
entityMappings:
- fieldMappings:
  - columnName: TargetUserName
    identifier: Name
  entityType: Account
- fieldMappings:
  - columnName: HostName
    identifier: HostName
  - columnName: DnsDomain
    identifier: DnsDomain
  entityType: Host
- fieldMappings:
  - columnName: DestinationIP
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: RequestURL
    identifier: Url
  entityType: URL
queryFrequency: 1d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Threat Protection Essentials/Analytic Rules/NetworkEndpointCorrelation.yaml
requiredDataConnectors:
- connectorId: TrendMicro
  dataTypes:
  - CommonSecurityLog
- connectorId: SecurityEvents
  dataTypes:
  - SecurityEvent
- connectorId: WindowsSecurityEvents
  dataTypes:
  - SecurityEvents
- connectorId: WindowsForwardedEvents
  dataTypes:
  - WindowsEvent
description: |
    'Correlates blocked URLs hosting [malicious] executables with host endpoint data to identify potential instances of executables of the same name having been recently run.
kind: Scheduled
version: 1.1.6
status: Available
severity: Medium
relevantTechniques:
- T1204
triggerOperator: gt
triggerThreshold: 0
tactics:
- Execution
id: 01f64465-b1ef-41ea-a7f5-31553a11ad43

ARM