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
Techniques	T1567
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	2.1.1
Arm template	4e55e306-3022-43a1-870a-41c4d5116079.json

KQL

let threshold = 25;
corelight_http
| where method in~ ('POST', 'PUT')
| where isempty(referrer)
| where orig_mime_types has_any ('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 uri, id_orig_h, bin(TimeGenerated, 15m)
| where count_ > threshold

YAML

name: Corelight - Multiple Compressed Files Transferred over HTTP
relevantTechniques:
- T1567
id: 4e55e306-3022-43a1-870a-41c4d5116079
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightMultipleCompressedFilesTransferredOverHTTP.yaml
requiredDataConnectors:
- dataTypes:
  - Corelight_v2_http
  - corelight_http
  connectorId: Corelight
version: 2.1.1
severity: Medium
triggerThreshold: 0
queryPeriod: 1h
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: id_orig_h
  entityType: IP
queryFrequency: 1h
status: Available
query: |
  let threshold = 25;
  corelight_http
  | where method in~ ('POST', 'PUT')
  | where isempty(referrer)
  | where orig_mime_types has_any ('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 uri, id_orig_h, bin(TimeGenerated, 15m)
  | where count_ > threshold  
tactics:
- Exfiltration
kind: Scheduled
description: |
    'Detects compressed archives transferre over HTTP.'
triggerOperator: gt

ARM