Corelight - Multiple Compressed Files Transferred over HTTP

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Id	4e55e306-3022-43a1-870a-41c4d5116079
Rulename	Corelight - Multiple Compressed Files Transferred over HTTP
Description	Detects compressed archives transferre over HTTP.
Severity	Medium
Tactics	Exfiltration
Required data connectors	Corelight
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/Corelight/Analytic Rules/CorelightMultipleCompressedFilesTransferredOverHTTP.yaml
Version	1.0.0
Arm template	4e55e306-3022-43a1-870a-41c4d5116079.json

KQL

let threshold = 25;
Corelight
| where EventType =~ 'http'
| where HttpRequestMethod in~ ('POST', 'PUT')
| where isempty(HttpReferrerOriginal)
| where SrcMimeType in~ ('application/vnd.ms-cab-compressed', 'application/warc', 'application/x-7z-compressed', 'application/x-ace', 'application/x-arc', 'application/x-archive', 'application/x-arj', 'application/x-compress', 'application/x-cpio', 'application/x-dmg', 'application/x-eet', 'application/x-gzip', 'application/x-lha', 'application/x-lrzip', 'application/x-lz4', 'application/x-lzma', 'application/x-lzh', 'application/x-lzip', 'application/x-rar', 'application/x-rpm', 'application/x-stuffit', 'application/x-tar', 'application/x-xz', 'application/x-zoo', 'application/zip')
| summarize count() by UrlOriginal, SrcIpAddr, bin(TimeGenerated, 15m)
| where count_ > threshold
| extend IPCustomEntity = SrcIpAddr

YAML

queryPeriod: 1h
version: 1.0.0
queryFrequency: 1h
kind: Scheduled
severity: Medium
name: Corelight - Multiple Compressed Files Transferred over HTTP
id: 4e55e306-3022-43a1-870a-41c4d5116079
entityMappings:
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightMultipleCompressedFilesTransferredOverHTTP.yaml
query: |
  let threshold = 25;
  Corelight
  | where EventType =~ 'http'
  | where HttpRequestMethod in~ ('POST', 'PUT')
  | where isempty(HttpReferrerOriginal)
  | where SrcMimeType in~ ('application/vnd.ms-cab-compressed', 'application/warc', 'application/x-7z-compressed', 'application/x-ace', 'application/x-arc', 'application/x-archive', 'application/x-arj', 'application/x-compress', 'application/x-cpio', 'application/x-dmg', 'application/x-eet', 'application/x-gzip', 'application/x-lha', 'application/x-lrzip', 'application/x-lz4', 'application/x-lzma', 'application/x-lzh', 'application/x-lzip', 'application/x-rar', 'application/x-rpm', 'application/x-stuffit', 'application/x-tar', 'application/x-xz', 'application/x-zoo', 'application/zip')
  | summarize count() by UrlOriginal, SrcIpAddr, bin(TimeGenerated, 15m)
  | where count_ > threshold
  | extend IPCustomEntity = SrcIpAddr  
tactics:
- Exfiltration
description: |
    'Detects compressed archives transferre over HTTP.'
requiredDataConnectors:
- connectorId: Corelight
  dataTypes:
  - Corelight
status: Available
triggerThreshold: 0
triggerOperator: gt

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/4e55e306-3022-43a1-870a-41c4d5116079')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4e55e306-3022-43a1-870a-41c4d5116079')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Corelight - Multiple Compressed Files Transferred over HTTP",
        "description": "'Detects compressed archives transferre over HTTP.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let threshold = 25;\nCorelight\n| where EventType =~ 'http'\n| where HttpRequestMethod in~ ('POST', 'PUT')\n| where isempty(HttpReferrerOriginal)\n| where SrcMimeType in~ ('application/vnd.ms-cab-compressed', 'application/warc', 'application/x-7z-compressed', 'application/x-ace', 'application/x-arc', 'application/x-archive', 'application/x-arj', 'application/x-compress', 'application/x-cpio', 'application/x-dmg', 'application/x-eet', 'application/x-gzip', 'application/x-lha', 'application/x-lrzip', 'application/x-lz4', 'application/x-lzma', 'application/x-lzh', 'application/x-lzip', 'application/x-rar', 'application/x-rpm', 'application/x-stuffit', 'application/x-tar', 'application/x-xz', 'application/x-zoo', 'application/zip')\n| summarize count() by UrlOriginal, SrcIpAddr, bin(TimeGenerated, 15m)\n| where count_ > threshold\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration"
        ],
        "alertRuleTemplateName": "4e55e306-3022-43a1-870a-41c4d5116079",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightMultipleCompressedFilesTransferredOverHTTP.yaml",
        "status": "Available",
        "templateVersion": "1.0.0"
      }
    }
  ]
}