Digital Guardian - Exfiltration to online fileshare

Back


Id	f7b6ddef-c1e9-46f0-8539-dbba7fb8a5b8
Rulename	Digital Guardian - Exfiltration to online fileshare
Description	Detects exfiltration to online fileshare.
Severity	High
Tactics	Exfiltration
Techniques	T1048
Required data connectors	SyslogAma
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/Digital Guardian Data Loss Prevention/Analytic Rules/DigitalGuardianExfiltrationToFileShareServices.yaml
Version	1.0.2
Arm template	f7b6ddef-c1e9-46f0-8539-dbba7fb8a5b8.json

KQL

let threshold = 10;
DigitalGuardianDLPEvent
| where isnotempty(inspected_document)
| where http_url contains 'dropbox' or http_url contains 'mega.nz'
| summarize f = dcount(inspected_document) by SrcUserName, bin(TimeGenerated, 30m)
| where f >= threshold
| extend AccountCustomEntity = SrcUserName

YAML

name: Digital Guardian - Exfiltration to online fileshare
id: f7b6ddef-c1e9-46f0-8539-dbba7fb8a5b8
description: |
    'Detects exfiltration to online fileshare.'
triggerThreshold: 0
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
  entityType: Account
version: 1.0.2
triggerOperator: gt
query: |
  let threshold = 10;
  DigitalGuardianDLPEvent
  | where isnotempty(inspected_document)
  | where http_url contains 'dropbox' or http_url contains 'mega.nz'
  | summarize f = dcount(inspected_document) by SrcUserName, bin(TimeGenerated, 30m)
  | where f >= threshold
  | extend AccountCustomEntity = SrcUserName  
tactics:
- Exfiltration
kind: Scheduled
queryFrequency: 1h
severity: High
queryPeriod: 1h
requiredDataConnectors:
- datatypes:
  - Syslog
  connectorId: SyslogAma
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Digital Guardian Data Loss Prevention/Analytic Rules/DigitalGuardianExfiltrationToFileShareServices.yaml
relevantTechniques:
- T1048

ARM