Corelight - Multiple files sent over HTTP with abnormal requests

Back


Id	7226d37b-50ee-4e3b-9f80-5b74080d8f2c
Rulename	Corelight - Multiple files sent over HTTP with abnormal requests
Description	Detects sources sending multiple compressed files greater than 10MBs sent over HTTP in a short amount of time.
Severity	Medium
Tactics	Exfiltration
Techniques	T1030
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/CorelightMultipleFilesSentOverHTTPAbnormalRequests.yaml
Version	2.1.0
Arm template	7226d37b-50ee-4e3b-9f80-5b74080d8f2c.json

KQL

let threshold = 25;
let fl_size_threshold = 10000000;
corelight_http
| where method in~ ('POST', 'PUT')
| where isempty(referrer)
| where tolong(request_body_len) > fl_size_threshold
| summarize count() by uri, id_orig_h, bin(TimeGenerated, 15m)
| where count_ > threshold

YAML

relevantTechniques:
- T1030
entityMappings:
- fieldMappings:
  - columnName: id_orig_h
    identifier: Address
  entityType: IP
triggerThreshold: 0
description: |
    'Detects sources sending multiple compressed files greater than 10MBs sent over HTTP in a short amount of time.'
requiredDataConnectors:
- connectorId: Corelight
  dataTypes:
  - Corelight_v2_http
  - corelight_http
triggerOperator: gt
version: 2.1.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightMultipleFilesSentOverHTTPAbnormalRequests.yaml
id: 7226d37b-50ee-4e3b-9f80-5b74080d8f2c
queryFrequency: 1h
query: |
  let threshold = 25;
  let fl_size_threshold = 10000000;
  corelight_http
  | where method in~ ('POST', 'PUT')
  | where isempty(referrer)
  | where tolong(request_body_len) > fl_size_threshold
  | summarize count() by uri, id_orig_h, bin(TimeGenerated, 15m)
  | where count_ > threshold  
severity: Medium
status: Available
queryPeriod: 1h
name: Corelight - Multiple files sent over HTTP with abnormal requests
tactics:
- Exfiltration
kind: Scheduled

ARM