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

entityMappings:
- fieldMappings:
  - columnName: id_orig_h
    identifier: Address
  entityType: IP
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightMultipleCompressedFilesTransferredOverHTTP.yaml
version: 2.1.1
tactics:
- Exfiltration
queryPeriod: 1h
kind: Scheduled
id: 4e55e306-3022-43a1-870a-41c4d5116079
severity: Medium
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  
triggerThreshold: 0
name: Corelight - Multiple Compressed Files Transferred over HTTP
status: Available
description: |
    'Detects compressed archives transferre over HTTP.'
relevantTechniques:
- T1567
requiredDataConnectors:
- connectorId: Corelight
  dataTypes:
  - Corelight_v2_http
  - corelight_http
queryFrequency: 1h

ARM