Detect NET runtime being loaded in JScript for code execution
Id | 9f921513-65f3-48a2-ae7d-326c5901c55e |
Rulename | Detect .NET runtime being loaded in JScript for code execution |
Description | This query detects .NET being loaded from wscript or cscript to run .NET code, such as cactustorch and sharpshooter. All based on the DotNetToJScript by James Foreshaw documented here https://github.com/tyranid/DotNetToJScript. |
Severity | Medium |
Tactics | Execution |
Techniques | T1204 |
Required data connectors | MicrosoftThreatProtection |
Kind | Scheduled |
Query frequency | 1h |
Query period | 1h |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/DotNetToJScript.yaml |
Version | 1.0.0 |
Arm template | 9f921513-65f3-48a2-ae7d-326c5901c55e.json |
DeviceImageLoadEvents
| where FileName in~ ("mscoree.dll", "mscorlib.dll", "mscorlib.ni.dll")
| where tolower(InitiatingProcessFileName) in ("wscript.exe", "cscript.exe", "mshta.exe")
kind: Scheduled
relevantTechniques:
- T1204
description: |
This query detects .NET being loaded from wscript or cscript to run .NET code, such as cactustorch and sharpshooter.
All based on the DotNetToJScript by James Foreshaw documented here https://github.com/tyranid/DotNetToJScript.
queryPeriod: 1h
queryFrequency: 1h
tactics:
- Execution
name: Detect .NET runtime being loaded in JScript for code execution
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
dataTypes:
- DeviceImageLoadEvents
entityMappings:
- entityType: Account
fieldMappings:
- identifier: Sid
columnName: InitiatingProcessAccountSid
- identifier: Name
columnName: InitiatingProcessAccountName
- identifier: NTDomain
columnName: InitiatingProcessAccountDomain
- entityType: Host
fieldMappings:
- identifier: FullName
columnName: DeviceName
- entityType: Process
fieldMappings:
- identifier: CommandLine
columnName: InitiatingProcessCommandLine
triggerThreshold: 0
version: 1.0.0
id: 9f921513-65f3-48a2-ae7d-326c5901c55e
query: |
DeviceImageLoadEvents
| where FileName in~ ("mscoree.dll", "mscorlib.dll", "mscorlib.ni.dll")
| where tolower(InitiatingProcessFileName) in ("wscript.exe", "cscript.exe", "mshta.exe")
status: Available
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/DotNetToJScript.yaml
severity: Medium
{
"$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/9f921513-65f3-48a2-ae7d-326c5901c55e')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9f921513-65f3-48a2-ae7d-326c5901c55e')]",
"properties": {
"alertRuleTemplateName": "9f921513-65f3-48a2-ae7d-326c5901c55e",
"customDetails": null,
"description": "This query detects .NET being loaded from wscript or cscript to run .NET code, such as cactustorch and sharpshooter.\nAll based on the DotNetToJScript by James Foreshaw documented here https://github.com/tyranid/DotNetToJScript. \n",
"displayName": "Detect .NET runtime being loaded in JScript for code execution",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "InitiatingProcessAccountSid",
"identifier": "Sid"
},
{
"columnName": "InitiatingProcessAccountName",
"identifier": "Name"
},
{
"columnName": "InitiatingProcessAccountDomain",
"identifier": "NTDomain"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "DeviceName",
"identifier": "FullName"
}
]
},
{
"entityType": "Process",
"fieldMappings": [
{
"columnName": "InitiatingProcessCommandLine",
"identifier": "CommandLine"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/DotNetToJScript.yaml",
"query": "DeviceImageLoadEvents \n| where FileName in~ (\"mscoree.dll\", \"mscorlib.dll\", \"mscorlib.ni.dll\") \n| where tolower(InitiatingProcessFileName) in (\"wscript.exe\", \"cscript.exe\", \"mshta.exe\")\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Execution"
],
"techniques": [
"T1204"
],
"templateVersion": "1.0.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}