Detect Local File InclusionLFI in web requests ASIM Web Session

let lookback = 5m;
let LFI_Indicators = materialize(externaldata(Indicators: string)
    [@"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/LocalFileInclusionIndicators.csv"] 
    with(format="csv", ignoreFirstRecord=True));
let CustomLocalFileInclusionIndicators = (_ASIM_GetWatchlistRaw("Web_LocalFileInclusionIndicators") // Create new Watchlist and add your custom indicators(Optional)
    | extend
        Indicators = tostring(WatchlistItem["Indicators"])
    | project Indicators
    | where isnotempty(Indicators));
let CombinedLFIList = union LFI_Indicators, CustomLocalFileInclusionIndicators;
let knownLFIIndicators=toscalar(CombinedLFIList
    | where isnotempty(Indicators)
    | summarize make_set(Indicators, 1000));
_Im_WebSession(starttime=ago(lookback), url_has_any=knownLFIIndicators, eventresult='Success')
| where isnotempty(Url)
| project Url, SrcIpAddr, SrcUsername, SrcHostname, TimeGenerated
| extend Decoded_url = url_decode(Url)
| where Decoded_url has_any (knownLFIIndicators)
| summarize
    EventCount=count(),
    EventStartTime=min(TimeGenerated),
    EventEndTime=max(TimeGenerated)
    by SrcIpAddr, SrcUsername, SrcHostname, Url, Decoded_url
| extend
    Name = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 0)[0]), SrcUsername),
    UPNSuffix = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 1)[0]), "")
| order by EventCount desc

version: 1.0.0
triggerThreshold: 0
description: |
  'LFI vulnerabilities allow an attacker to read (and sometimes execute) files on the victim machine. This can be very dangerous because if the web server is misconfigured and running with high privileges, the attacker may gain access to sensitive information'
severity: High
eventGroupingSettings:
  aggregationKind: AlertPerResult
customDetails:
  EventCount: EventCount
  EventStartTime: EventStartTime
  Decoded_url: Decoded_url
  EventEndTime: EventEndTime
status: Available
kind: Scheduled
queryFrequency: 5m
tags:
- Schema: WebSession
  SchemaVersion: 0.2.6
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Web%20Session%20Essentials/Analytic%20Rules/LocalFileInclusion-LFI.yaml
id: 7bb55d05-ef39-4a40-8079-0bc3c05e7881
requiredDataConnectors: []
triggerOperator: gt
queryPeriod: 5m
tactics:
- InitialAccess
- Execution
relevantTechniques:
- T1190
- T1133
- T1059
query: |
  let lookback = 5m;
  let LFI_Indicators = materialize(externaldata(Indicators: string)
      [@"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/LocalFileInclusionIndicators.csv"] 
      with(format="csv", ignoreFirstRecord=True));
  let CustomLocalFileInclusionIndicators = (_ASIM_GetWatchlistRaw("Web_LocalFileInclusionIndicators") // Create new Watchlist and add your custom indicators(Optional)
      | extend
          Indicators = tostring(WatchlistItem["Indicators"])
      | project Indicators
      | where isnotempty(Indicators));
  let CombinedLFIList = union LFI_Indicators, CustomLocalFileInclusionIndicators;
  let knownLFIIndicators=toscalar(CombinedLFIList
      | where isnotempty(Indicators)
      | summarize make_set(Indicators, 1000));
  _Im_WebSession(starttime=ago(lookback), url_has_any=knownLFIIndicators, eventresult='Success')
  | where isnotempty(Url)
  | project Url, SrcIpAddr, SrcUsername, SrcHostname, TimeGenerated
  | extend Decoded_url = url_decode(Url)
  | where Decoded_url has_any (knownLFIIndicators)
  | summarize
      EventCount=count(),
      EventStartTime=min(TimeGenerated),
      EventEndTime=max(TimeGenerated)
      by SrcIpAddr, SrcUsername, SrcHostname, Url, Decoded_url
  | extend
      Name = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 0)[0]), SrcUsername),
      UPNSuffix = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 1)[0]), "")
  | order by EventCount desc
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SrcIpAddr
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: Url
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: Name
  - identifier: UPNSuffix
    columnName: UPNSuffix
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: SrcHostname
alertDetailsOverride:
  alertDisplayNameFormat: Potential Local File Inlcusion(LFI) performed by user '{{SrcUsername}}' from IP '{{SrcIpAddr}}'
  alertDescriptionFormat: User requested for URL '{{Url}}' which contains LFI related keywords or indicators. It suggests an attempt to traverse directories and access files outside the intended directory structure
name: Detect Local File Inclusion(LFI) in web requests (ASIM Web Session)

{
  "$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/7bb55d05-ef39-4a40-8079-0bc3c05e7881')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/7bb55d05-ef39-4a40-8079-0bc3c05e7881')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "User requested for URL '{{Url}}' which contains LFI related keywords or indicators. It suggests an attempt to traverse directories and access files outside the intended directory structure",
          "alertDisplayNameFormat": "Potential Local File Inlcusion(LFI) performed by user '{{SrcUsername}}' from IP '{{SrcIpAddr}}'"
        },
        "alertRuleTemplateName": "7bb55d05-ef39-4a40-8079-0bc3c05e7881",
        "customDetails": {
          "Decoded_url": "Decoded_url",
          "EventCount": "EventCount",
          "EventEndTime": "EventEndTime",
          "EventStartTime": "EventStartTime"
        },
        "description": "'LFI vulnerabilities allow an attacker to read (and sometimes execute) files on the victim machine. This can be very dangerous because if the web server is misconfigured and running with high privileges, the attacker may gain access to sensitive information'\n",
        "displayName": "Detect Local File Inclusion(LFI) in web requests (ASIM Web Session)",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SrcIpAddr",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "SrcHostname",
                "identifier": "HostName"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Web%20Session%20Essentials/Analytic%20Rules/LocalFileInclusion-LFI.yaml",
        "query": "let lookback = 5m;\nlet LFI_Indicators = materialize(externaldata(Indicators: string)\n    [@\"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/LocalFileInclusionIndicators.csv\"] \n    with(format=\"csv\", ignoreFirstRecord=True));\nlet CustomLocalFileInclusionIndicators = (_ASIM_GetWatchlistRaw(\"Web_LocalFileInclusionIndicators\") // Create new Watchlist and add your custom indicators(Optional)\n    | extend\n        Indicators = tostring(WatchlistItem[\"Indicators\"])\n    | project Indicators\n    | where isnotempty(Indicators));\nlet CombinedLFIList = union LFI_Indicators, CustomLocalFileInclusionIndicators;\nlet knownLFIIndicators=toscalar(CombinedLFIList\n    | where isnotempty(Indicators)\n    | summarize make_set(Indicators, 1000));\n_Im_WebSession(starttime=ago(lookback), url_has_any=knownLFIIndicators, eventresult='Success')\n| where isnotempty(Url)\n| project Url, SrcIpAddr, SrcUsername, SrcHostname, TimeGenerated\n| extend Decoded_url = url_decode(Url)\n| where Decoded_url has_any (knownLFIIndicators)\n| summarize\n    EventCount=count(),\n    EventStartTime=min(TimeGenerated),\n    EventEndTime=max(TimeGenerated)\n    by SrcIpAddr, SrcUsername, SrcHostname, Url, Decoded_url\n| extend\n    Name = iif(SrcUsername contains \"@\", tostring(split(SrcUsername, '@', 0)[0]), SrcUsername),\n    UPNSuffix = iif(SrcUsername contains \"@\", tostring(split(SrcUsername, '@', 1)[0]), \"\")\n| order by EventCount desc\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution",
          "InitialAccess"
        ],
        "tags": [
          {
            "Schema": "WebSession",
            "SchemaVersion": "0.2.6"
          }
        ],
        "techniques": [
          "T1059",
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}