title: Large Data Transfer
id: cc59abbb-24b0-5a9b-b95c-6b02a7e3f1c2
custom_id: wf-net-004
status: stable
level: high
description: |
    Detects unusually large outbound data transfers that may indicate data
    exfiltration. Triggers when total bytes transferred exceeds 100MB in a
    single connection/session.
author: WitFoo
date: 2026-02-21
tags:
    - attack.exfiltration
    - attack.t1048
references:
    - https://attack.mitre.org/techniques/T1048/
logsource:
    product: witfoo
    service: artifact-exporter
detection:
    selection:
        totalBytes|gte: 104857600
    condition: selection
fields:
    - clientIP
    - serverIP
    - totalBytes
    - protocol
    - application
    - userName
falsepositives:
    - Backup operations to offsite storage
    - Large file uploads to approved cloud services
    - Database replication traffic
    - Software deployment and distribution
