> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/analytics-alerts/alerts-by-name/massive-upload-to-a-rare-storage-or-mail-domain.md).
# Massive upload to a rare storage or mail domain
### Synopsis
| Field | Value |
| -------------------- | ------------------------------------------------------------------------------------------------------------------------------------- |
| Activation Period | 14 Days |
| Training Period | 30 Days |
| Test Period | 1 Hour |
| Deduplication Period | 1 Day |
| Required Data | Requires all of the following:
Palo Alto Networks Firewall EAL Logs OR Palo Alto Networks Firewall threat Logs
XDR Agent
|
| Detection Modules | Identity Threat Module |
| Detector Tags | Data Detection & Response |
| ATT\&CK Tactic | Exfiltration (TA0010) |
| ATT\&CK Technique | Exfiltration Over Web Service (T1567), Exfiltration Over Web Service: Exfiltration to Cloud Storage (T1567.002) |
| Severity | Informational |
### Description
A large amount of data was transferred to an external site that is used for mail or storage. This behavior may indicate data exfiltration.
### Attacker's Goals
A user uploaded an abnormal amount of data to a file sharing service. This activity might indicate an attempt to exfiltrate files and data from the organization.
### Investigative actions
* Check for any other suspicious activity related to the host and the user involved in the alert.
* Identify the user uploading the data to determine if the transfer is sanctioned.
### Variations
A user uploaded over 500 MB to a rare storage or mail domain
**Synopsis**
| Field | Value |
| ----------------- | --------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Exfiltration (TA0010) |
| ATT\&CK Technique | Exfiltration Over Web Service (T1567), Exfiltration Over Web Service: Exfiltration to Cloud Storage (T1567.002) |
| Severity | Low |
**Description**
A user uploaded over 500 MB to a file sharing service that is rarely accessed by them or anyone else in the organization.
**Attacker's Goals**
A user uploaded an abnormal amount of data to a file sharing service. This activity might indicate an attempt to exfiltrate files and data from the organization.
**Investigative actions**
* Check for any other suspicious activity related to the host and the user involved in the alert.
* Identify the user uploading the data to determine if the transfer is sanctioned.
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