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

triggerOperator: gt
version: 1.0.0
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  
status: Available
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightMultipleCompressedFilesTransferredOverHTTP.yaml
queryFrequency: 1h
requiredDataConnectors:
- connectorId: Corelight
  dataTypes:
  - Corelight
name: Corelight - Multiple Compressed Files Transferred over HTTP
queryPeriod: 1h
severity: Medium
kind: Scheduled
tactics:
- Exfiltration
id: 4e55e306-3022-43a1-870a-41c4d5116079
description: |
    'Detects compressed archives transferre over HTTP.'
triggerThreshold: 0

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-preview",
      "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": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightMultipleCompressedFilesTransferredOverHTTP.yaml",
        "status": "Available",
        "templateVersion": "1.0.0"
      }
    }
  ]
}