Microsoft Sentinel Analytic Rules
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Linked Malicious Storage Artifacts

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Idb9e3b9f8-a406-4151-9891-e5ff1ddd8c1d
RulenameLinked Malicious Storage Artifacts
DescriptionThis query identifies the additional files uploaded by the same IP address which triggered a malware alert for malicious content upload on Azure Blob or File Storage Container.
SeverityMedium
TacticsCommandAndControl
Exfiltration
TechniquesT1071
T1567
Required data connectorsMicrosoftCloudAppSecurity
KindScheduled
Query frequency1d
Query period1d
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender for Cloud Apps/Analytic Rules/AdditionalFilesUploadedByActor.yaml
Version1.0.3
Arm templateb9e3b9f8-a406-4151-9891-e5ff1ddd8c1d.json
Deploy To Azure
//Collect the alert events
let alertData = SecurityAlert
| where DisplayName has "Potential malware uploaded to"
| extend Entities = parse_json(Entities)
| mv-expand Entities;
//Parse the IP address data
let ipData = alertData
| where Entities['Type'] =~ "ip"
| extend AttackerIP = tostring(Entities['Address']), AttackerCountry = tostring(Entities['Location']['CountryName']);
//Parse the file data
let FileData = alertData
| where Entities['Type'] =~ "file"
| extend MaliciousFileDirectory = tostring(Entities['Directory']), MaliciousFileName = tostring(Entities['Name']), MaliciousFileHashes = tostring(Entities['FileHashes']);
//Combine the File and IP data together
ipData
| join (FileData) on VendorOriginalId
| summarize by TimeGenerated, AttackerIP, AttackerCountry, DisplayName, ResourceId, AlertType, MaliciousFileDirectory, MaliciousFileName, MaliciousFileHashes
//Create a type column so we can track if it was a File storage or blobl storage upload
| extend type = iff(DisplayName has "file", "File", "Blob")
| join (
  union
  StorageFileLogs,
  StorageBlobLogs
  //File upload operations
  | where OperationName =~ "PutBlob" or OperationName =~ "PutRange"
  //Parse out the uploader IP
  | extend ClientIP = tostring(split(CallerIpAddress, ":", 0)[0])
  //Extract the filename from the Uri
  | extend FileName = extract(@"\/([\w\-. ]+)\?", 1, Uri)
  //Base64 decode the MD5 filehash, we will encounter non-ascii hex so string operations don't work
  //We can work around this by making it an array then converting it to hex from an int
  | extend base64Char = base64_decode_toarray(ResponseMd5)
  | mv-expand base64Char
  | extend hexChar = tohex(toint(base64Char))
  | extend hexChar = iff(strlen(hexChar) < 2, strcat("0", hexChar), hexChar)
  | extend SourceTable = iff(OperationName has "range", "StorageFileLogs", "StorageBlobLogs")
  | summarize make_list(hexChar, 1000) by CorrelationId, ResponseMd5, FileName, AccountName, TimeGenerated, RequestBodySize, ClientIP, SourceTable
  | extend Md5Hash = strcat_array(list_hexChar, "")
  //Pack the file information the summarise into a ClientIP row
  | extend p = pack("FileName", FileName, "FileSize", RequestBodySize, "Md5Hash", Md5Hash, "Time", TimeGenerated, "SourceTable", SourceTable)
  | summarize UploadedFileInfo=make_list(p, 10000), FilesUploaded=count() by ClientIP
      | join kind=leftouter (
        union
        StorageFileLogs,
        StorageBlobLogs
        | where OperationName =~ "DeleteFile" or OperationName =~ "DeleteBlob"
        | extend ClientIP = tostring(split(CallerIpAddress, ":", 0)[0])
        | extend FileName = extract(@"\/([\w\-. ]+)\?", 1, Uri)
        | extend SourceTable = iff(OperationName has "range", "StorageFileLogs", "StorageBlobLogs")
        | extend p = pack("FileName", FileName, "Time", TimeGenerated, "SourceTable", SourceTable)
        | summarize DeletedFileInfo=make_list(p, 10000), FilesDeleted=count() by ClientIP
        ) on ClientIP
  ) on $left.AttackerIP == $right.ClientIP
| mvexpand UploadedFileInfo
| extend LinkedMaliciousFileName = tostring(UploadedFileInfo.FileName)
| extend LinkedMaliciousFileHash = tostring(UploadedFileInfo.Md5Hash)
| extend HashAlgorithm = "MD5"
| project AlertTimeGenerated = TimeGenerated, LinkedMaliciousFileName, LinkedMaliciousFileHash, HashAlgorithm, AlertType, AttackerIP, AttackerCountry, MaliciousFileDirectory, MaliciousFileName, FilesUploaded, UploadedFileInfo

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender for Cloud Apps/Analytic Rules/AdditionalFilesUploadedByActor.yaml
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: AttackerIP
  entityType: IP
- fieldMappings:
  - identifier: Algorithm
    columnName: HashAlgorithm
  - identifier: Value
    columnName: LinkedMaliciousFileHash
  entityType: FileHash
kind: Scheduled
query: |
  //Collect the alert events
  let alertData = SecurityAlert
  | where DisplayName has "Potential malware uploaded to"
  | extend Entities = parse_json(Entities)
  | mv-expand Entities;
  //Parse the IP address data
  let ipData = alertData
  | where Entities['Type'] =~ "ip"
  | extend AttackerIP = tostring(Entities['Address']), AttackerCountry = tostring(Entities['Location']['CountryName']);
  //Parse the file data
  let FileData = alertData
  | where Entities['Type'] =~ "file"
  | extend MaliciousFileDirectory = tostring(Entities['Directory']), MaliciousFileName = tostring(Entities['Name']), MaliciousFileHashes = tostring(Entities['FileHashes']);
  //Combine the File and IP data together
  ipData
  | join (FileData) on VendorOriginalId
  | summarize by TimeGenerated, AttackerIP, AttackerCountry, DisplayName, ResourceId, AlertType, MaliciousFileDirectory, MaliciousFileName, MaliciousFileHashes
  //Create a type column so we can track if it was a File storage or blobl storage upload
  | extend type = iff(DisplayName has "file", "File", "Blob")
  | join (
    union
    StorageFileLogs,
    StorageBlobLogs
    //File upload operations
    | where OperationName =~ "PutBlob" or OperationName =~ "PutRange"
    //Parse out the uploader IP
    | extend ClientIP = tostring(split(CallerIpAddress, ":", 0)[0])
    //Extract the filename from the Uri
    | extend FileName = extract(@"\/([\w\-. ]+)\?", 1, Uri)
    //Base64 decode the MD5 filehash, we will encounter non-ascii hex so string operations don't work
    //We can work around this by making it an array then converting it to hex from an int
    | extend base64Char = base64_decode_toarray(ResponseMd5)
    | mv-expand base64Char
    | extend hexChar = tohex(toint(base64Char))
    | extend hexChar = iff(strlen(hexChar) < 2, strcat("0", hexChar), hexChar)
    | extend SourceTable = iff(OperationName has "range", "StorageFileLogs", "StorageBlobLogs")
    | summarize make_list(hexChar, 1000) by CorrelationId, ResponseMd5, FileName, AccountName, TimeGenerated, RequestBodySize, ClientIP, SourceTable
    | extend Md5Hash = strcat_array(list_hexChar, "")
    //Pack the file information the summarise into a ClientIP row
    | extend p = pack("FileName", FileName, "FileSize", RequestBodySize, "Md5Hash", Md5Hash, "Time", TimeGenerated, "SourceTable", SourceTable)
    | summarize UploadedFileInfo=make_list(p, 10000), FilesUploaded=count() by ClientIP
        | join kind=leftouter (
          union
          StorageFileLogs,
          StorageBlobLogs
          | where OperationName =~ "DeleteFile" or OperationName =~ "DeleteBlob"
          | extend ClientIP = tostring(split(CallerIpAddress, ":", 0)[0])
          | extend FileName = extract(@"\/([\w\-. ]+)\?", 1, Uri)
          | extend SourceTable = iff(OperationName has "range", "StorageFileLogs", "StorageBlobLogs")
          | extend p = pack("FileName", FileName, "Time", TimeGenerated, "SourceTable", SourceTable)
          | summarize DeletedFileInfo=make_list(p, 10000), FilesDeleted=count() by ClientIP
          ) on ClientIP
    ) on $left.AttackerIP == $right.ClientIP
  | mvexpand UploadedFileInfo
  | extend LinkedMaliciousFileName = tostring(UploadedFileInfo.FileName)
  | extend LinkedMaliciousFileHash = tostring(UploadedFileInfo.Md5Hash)
  | extend HashAlgorithm = "MD5"
  | project AlertTimeGenerated = TimeGenerated, LinkedMaliciousFileName, LinkedMaliciousFileHash, HashAlgorithm, AlertType, AttackerIP, AttackerCountry, MaliciousFileDirectory, MaliciousFileName, FilesUploaded, UploadedFileInfo  
triggerOperator: gt
version: 1.0.3
queryPeriod: 1d
name: Linked Malicious Storage Artifacts
severity: Medium
relevantTechniques:
- T1071
- T1567
requiredDataConnectors:
- dataTypes:
  - SecurityAlert
  connectorId: MicrosoftCloudAppSecurity
triggerThreshold: 0
tactics:
- CommandAndControl
- Exfiltration
queryFrequency: 1d
id: b9e3b9f8-a406-4151-9891-e5ff1ddd8c1d
status: Available
description: |
    'This query identifies the additional files uploaded by the same IP address which triggered a malware alert for malicious content upload on Azure Blob or File Storage Container.'

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/b9e3b9f8-a406-4151-9891-e5ff1ddd8c1d')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b9e3b9f8-a406-4151-9891-e5ff1ddd8c1d')]",
      "properties": {
        "alertRuleTemplateName": "b9e3b9f8-a406-4151-9891-e5ff1ddd8c1d",
        "customDetails": null,
        "description": "'This query identifies the additional files uploaded by the same IP address which triggered a malware alert for malicious content upload on Azure Blob or File Storage Container.'\n",
        "displayName": "Linked Malicious Storage Artifacts",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "AttackerIP",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "FileHash",
            "fieldMappings": [
              {
                "columnName": "HashAlgorithm",
                "identifier": "Algorithm"
              },
              {
                "columnName": "LinkedMaliciousFileHash",
                "identifier": "Value"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender for Cloud Apps/Analytic Rules/AdditionalFilesUploadedByActor.yaml",
        "query": "//Collect the alert events\nlet alertData = SecurityAlert\n| where DisplayName has \"Potential malware uploaded to\"\n| extend Entities = parse_json(Entities)\n| mv-expand Entities;\n//Parse the IP address data\nlet ipData = alertData\n| where Entities['Type'] =~ \"ip\"\n| extend AttackerIP = tostring(Entities['Address']), AttackerCountry = tostring(Entities['Location']['CountryName']);\n//Parse the file data\nlet FileData = alertData\n| where Entities['Type'] =~ \"file\"\n| extend MaliciousFileDirectory = tostring(Entities['Directory']), MaliciousFileName = tostring(Entities['Name']), MaliciousFileHashes = tostring(Entities['FileHashes']);\n//Combine the File and IP data together\nipData\n| join (FileData) on VendorOriginalId\n| summarize by TimeGenerated, AttackerIP, AttackerCountry, DisplayName, ResourceId, AlertType, MaliciousFileDirectory, MaliciousFileName, MaliciousFileHashes\n//Create a type column so we can track if it was a File storage or blobl storage upload\n| extend type = iff(DisplayName has \"file\", \"File\", \"Blob\")\n| join (\n  union\n  StorageFileLogs,\n  StorageBlobLogs\n  //File upload operations\n  | where OperationName =~ \"PutBlob\" or OperationName =~ \"PutRange\"\n  //Parse out the uploader IP\n  | extend ClientIP = tostring(split(CallerIpAddress, \":\", 0)[0])\n  //Extract the filename from the Uri\n  | extend FileName = extract(@\"\\/([\\w\\-. ]+)\\?\", 1, Uri)\n  //Base64 decode the MD5 filehash, we will encounter non-ascii hex so string operations don't work\n  //We can work around this by making it an array then converting it to hex from an int\n  | extend base64Char = base64_decode_toarray(ResponseMd5)\n  | mv-expand base64Char\n  | extend hexChar = tohex(toint(base64Char))\n  | extend hexChar = iff(strlen(hexChar) < 2, strcat(\"0\", hexChar), hexChar)\n  | extend SourceTable = iff(OperationName has \"range\", \"StorageFileLogs\", \"StorageBlobLogs\")\n  | summarize make_list(hexChar, 1000) by CorrelationId, ResponseMd5, FileName, AccountName, TimeGenerated, RequestBodySize, ClientIP, SourceTable\n  | extend Md5Hash = strcat_array(list_hexChar, \"\")\n  //Pack the file information the summarise into a ClientIP row\n  | extend p = pack(\"FileName\", FileName, \"FileSize\", RequestBodySize, \"Md5Hash\", Md5Hash, \"Time\", TimeGenerated, \"SourceTable\", SourceTable)\n  | summarize UploadedFileInfo=make_list(p, 10000), FilesUploaded=count() by ClientIP\n      | join kind=leftouter (\n        union\n        StorageFileLogs,\n        StorageBlobLogs\n        | where OperationName =~ \"DeleteFile\" or OperationName =~ \"DeleteBlob\"\n        | extend ClientIP = tostring(split(CallerIpAddress, \":\", 0)[0])\n        | extend FileName = extract(@\"\\/([\\w\\-. ]+)\\?\", 1, Uri)\n        | extend SourceTable = iff(OperationName has \"range\", \"StorageFileLogs\", \"StorageBlobLogs\")\n        | extend p = pack(\"FileName\", FileName, \"Time\", TimeGenerated, \"SourceTable\", SourceTable)\n        | summarize DeletedFileInfo=make_list(p, 10000), FilesDeleted=count() by ClientIP\n        ) on ClientIP\n  ) on $left.AttackerIP == $right.ClientIP\n| mvexpand UploadedFileInfo\n| extend LinkedMaliciousFileName = tostring(UploadedFileInfo.FileName)\n| extend LinkedMaliciousFileHash = tostring(UploadedFileInfo.Md5Hash)\n| extend HashAlgorithm = \"MD5\"\n| project AlertTimeGenerated = TimeGenerated, LinkedMaliciousFileName, LinkedMaliciousFileHash, HashAlgorithm, AlertType, AttackerIP, AttackerCountry, MaliciousFileDirectory, MaliciousFileName, FilesUploaded, UploadedFileInfo\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl",
          "Exfiltration"
        ],
        "techniques": [
          "T1071",
          "T1567"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}