SharePointFileOperation via previously unseen IPs

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Id	4b11568b-3f5f-4ba1-80c8-7f1dc8390eb7
Rulename	SharePointFileOperation via previously unseen IPs
Description	Identifies when the volume of documents uploaded to or downloaded from Sharepoint by new IP addresses exceeds a threshold (default is 50).
Severity	Medium
Tactics	Exfiltration
Techniques	T1030
Required data connectors	Office365
Kind	Scheduled
Query frequency	1d
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft 365/Analytic Rules/SharePoint_Downloads_byNewIP.yaml
Version	2.0.1
Arm template	4b11568b-3f5f-4ba1-80c8-7f1dc8390eb7.json

KQL

let threshold = 50;
let szSharePointFileOperation = "SharePointFileOperation";
let szOperations = dynamic(["FileDownloaded", "FileUploaded"]);
let starttime = 14d;
let endtime = 1d;
let historicalActivity =
OfficeActivity
| where TimeGenerated between(ago(starttime)..ago(endtime))
| where RecordType =~ szSharePointFileOperation
| where Operation in~ (szOperations)
| summarize historicalCount = count() by ClientIP, RecordType, Operation;
let recentActivity = OfficeActivity
| where TimeGenerated > ago(endtime)
| where RecordType =~ szSharePointFileOperation
| where Operation in~ (szOperations)
| summarize min(Start_Time), max(Start_Time), recentCount = count() by ClientIP, RecordType, Operation;
let RareIP = recentActivity | join kind= leftanti ( historicalActivity ) on ClientIP, RecordType, Operation
// More than 50 downloads/uploads from a new IP
| where recentCount > threshold;
OfficeActivity
| where TimeGenerated >= ago(endtime)
| where RecordType =~ szSharePointFileOperation
| where Operation in~ (szOperations)
| join kind= inner (RareIP) on ClientIP, RecordType, Operation
| where Start_Time between(min_Start_Time .. max_Start_Time)
| summarize StartTimeUtc = min(min_Start_Time), EndTimeUtc = max(max_Start_Time) by RecordType, Operation, UserType, UserId, ClientIP, OfficeWorkload, Site_Url, OfficeObjectId, UserAgent, IPSeenCount = recentCount
| extend timestamp = StartTimeUtc, AccountCustomEntity = UserId, IPCustomEntity = ClientIP, URLCustomEntity = Site_Url
| order by IPSeenCount desc, ClientIP asc, Operation asc, UserId asc

YAML

severity: Medium
name: SharePointFileOperation via previously unseen IPs
requiredDataConnectors:
- dataTypes:
  - OfficeActivity
  connectorId: Office365
id: 4b11568b-3f5f-4ba1-80c8-7f1dc8390eb7
tactics:
- Exfiltration
queryFrequency: 1d
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft 365/Analytic Rules/SharePoint_Downloads_byNewIP.yaml
description: |
  'Identifies when the volume of documents uploaded to or downloaded from Sharepoint by new IP addresses
  exceeds a threshold (default is 50).'  
triggerThreshold: 0
kind: Scheduled
relevantTechniques:
- T1030
query: |
  let threshold = 50;
  let szSharePointFileOperation = "SharePointFileOperation";
  let szOperations = dynamic(["FileDownloaded", "FileUploaded"]);
  let starttime = 14d;
  let endtime = 1d;
  let historicalActivity =
  OfficeActivity
  | where TimeGenerated between(ago(starttime)..ago(endtime))
  | where RecordType =~ szSharePointFileOperation
  | where Operation in~ (szOperations)
  | summarize historicalCount = count() by ClientIP, RecordType, Operation;
  let recentActivity = OfficeActivity
  | where TimeGenerated > ago(endtime)
  | where RecordType =~ szSharePointFileOperation
  | where Operation in~ (szOperations)
  | summarize min(Start_Time), max(Start_Time), recentCount = count() by ClientIP, RecordType, Operation;
  let RareIP = recentActivity | join kind= leftanti ( historicalActivity ) on ClientIP, RecordType, Operation
  // More than 50 downloads/uploads from a new IP
  | where recentCount > threshold;
  OfficeActivity
  | where TimeGenerated >= ago(endtime)
  | where RecordType =~ szSharePointFileOperation
  | where Operation in~ (szOperations)
  | join kind= inner (RareIP) on ClientIP, RecordType, Operation
  | where Start_Time between(min_Start_Time .. max_Start_Time)
  | summarize StartTimeUtc = min(min_Start_Time), EndTimeUtc = max(max_Start_Time) by RecordType, Operation, UserType, UserId, ClientIP, OfficeWorkload, Site_Url, OfficeObjectId, UserAgent, IPSeenCount = recentCount
  | extend timestamp = StartTimeUtc, AccountCustomEntity = UserId, IPCustomEntity = ClientIP, URLCustomEntity = Site_Url
  | order by IPSeenCount desc, ClientIP asc, Operation asc, UserId asc  
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
- entityType: URL
  fieldMappings:
  - columnName: URLCustomEntity
    identifier: Url
status: Available
version: 2.0.1
queryPeriod: 14d

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/4b11568b-3f5f-4ba1-80c8-7f1dc8390eb7')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4b11568b-3f5f-4ba1-80c8-7f1dc8390eb7')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "SharePointFileOperation via previously unseen IPs",
        "description": "'Identifies when the volume of documents uploaded to or downloaded from Sharepoint by new IP addresses\nexceeds a threshold (default is 50).'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let threshold = 50;\nlet szSharePointFileOperation = \"SharePointFileOperation\";\nlet szOperations = dynamic([\"FileDownloaded\", \"FileUploaded\"]);\nlet starttime = 14d;\nlet endtime = 1d;\nlet historicalActivity =\nOfficeActivity\n| where TimeGenerated between(ago(starttime)..ago(endtime))\n| where RecordType =~ szSharePointFileOperation\n| where Operation in~ (szOperations)\n| summarize historicalCount = count() by ClientIP, RecordType, Operation;\nlet recentActivity = OfficeActivity\n| where TimeGenerated > ago(endtime)\n| where RecordType =~ szSharePointFileOperation\n| where Operation in~ (szOperations)\n| summarize min(Start_Time), max(Start_Time), recentCount = count() by ClientIP, RecordType, Operation;\nlet RareIP = recentActivity | join kind= leftanti ( historicalActivity ) on ClientIP, RecordType, Operation\n// More than 50 downloads/uploads from a new IP\n| where recentCount > threshold;\nOfficeActivity\n| where TimeGenerated >= ago(endtime)\n| where RecordType =~ szSharePointFileOperation\n| where Operation in~ (szOperations)\n| join kind= inner (RareIP) on ClientIP, RecordType, Operation\n| where Start_Time between(min_Start_Time .. max_Start_Time)\n| summarize StartTimeUtc = min(min_Start_Time), EndTimeUtc = max(max_Start_Time) by RecordType, Operation, UserType, UserId, ClientIP, OfficeWorkload, Site_Url, OfficeObjectId, UserAgent, IPSeenCount = recentCount\n| extend timestamp = StartTimeUtc, AccountCustomEntity = UserId, IPCustomEntity = ClientIP, URLCustomEntity = Site_Url\n| order by IPSeenCount desc, ClientIP asc, Operation asc, UserId asc\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P14D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration"
        ],
        "techniques": [
          "T1030"
        ],
        "alertRuleTemplateName": "4b11568b-3f5f-4ba1-80c8-7f1dc8390eb7",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Url",
                "columnName": "URLCustomEntity"
              }
            ],
            "entityType": "URL"
          }
        ],
        "status": "Available",
        "templateVersion": "2.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft 365/Analytic Rules/SharePoint_Downloads_byNewIP.yaml"
      }
    }
  ]
}