Anthropic High File Upload Activity

Last updated 4 days ago on 2026-09-21
Created 10 days ago on 2026-09-15

About

Detects an unusually high volume of Claude file uploads from the same user email and source IP within a rolling 24-hour period. Sustained upload activity can indicate staging of sensitive documents in Claude chats for later retrieval, automated ingestion of data into LLM workflows, or abuse of organizational Claude access to move files into the cloud service.
Tags
Domain: GenAIPlatform: AnthropicData Source: Anthropic Audit LogsUse Case: Threat DetectionUse Case: UEBARule Type: ES|QLTactic: ExfiltrationLanguage: esql
Severity
medium
Risk Score
47
MITRE ATT&CK™

Exfiltration (TA0010)(external, opens in a new tab or window)

False Positive Examples
Developers, analysts, or knowledge workers bulk-uploading documents during migrations, evaluations, or large project onboarding can exceed the daily threshold from a single workstation or VPN egress.
License
Elastic License v2(external, opens in a new tab or window)

Definition

Integration Pack
Prebuilt Security Detection Rules
Related Integrations

anthropic(external, opens in a new tab or window)

Query
text code block:
from logs-anthropic.audit-* | where data_stream.dataset == "anthropic.audit" and event.action == "claude_file_uploaded" and event.outcome == "success" and user.email is not null and source.ip is not null | stats Esql.event_count = count(*), Esql.event_id_values = values(event.id), Esql.file_name_values = values(file.name), Esql.anthropic_audit_claude_file_id_values = values(anthropic.audit.claude_file_id), Esql.anthropic_audit_claude_chat_id_values = values(anthropic.audit.claude_chat_id), Esql.anthropic_audit_claude_project_id_values = values(anthropic.audit.claude_project_id), Esql.user_agent_original_values = values(user_agent.original), Esql.anthropic_audit_actor_type_values = values(anthropic.audit.actor.type), Esql.timestamp_first_seen = min(@timestamp), Esql.timestamp_last_seen = max(@timestamp) by user.email, source.ip | where Esql.event_count >= 100 | keep user.email, source.ip, Esql.*

Install detection rules in Elastic Security

Detect Anthropic High File Upload Activity in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).