> 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/outbound-email-contains-file-sharing-service-link-sent-to-external-recipient.md).
# Outbound email contains file-sharing service link sent to external recipient
### Synopsis
| Field | Value |
| -------------------- | ------------------------------------------------------------------ |
| Activation Period | 14 Days |
| Training Period | 30 Days |
| Test Period | N/A (single event) |
| Deduplication Period | 1 Hour 30 Minutes |
| Required Data | Microsoft 365 Emails |
| Detection Modules | Email |
| Detector Tags | Exfiltration |
| ATT\&CK Tactic | Execution (TA0002), Credential Access (TA0006) |
| ATT\&CK Technique | User Execution (T1204), Brute Force: Password Cracking (T1110.002) |
| Severity | Informational |
### Description
Identifies outbound emails that include links to file-sharing services sent externally.
### Attacker's Goals
Exfiltrate data by sharing a link to a file-sharing service with external recipients, bypassing attachment inspection and potentially evading visibility controls.
### Investigative actions
* Review the shared URL to determine if the file is publicly accessible or shared outside the organization.
* Check if the file-sharing domain has been previously used by this sender or others in the organization.
* Investigate recent outbound emails for similar use of file-sharing services or unusual external recipients.
### Variations
Outbound email to external recipient(s) uses first-seen for organization file-sharing service
**Synopsis**
| Field | Value |
| ----------------- | ------------------------------------------------------------------ |
| ATT\&CK Tactic | Execution (TA0002), Credential Access (TA0006) |
| ATT\&CK Technique | User Execution (T1204), Brute Force: Password Cracking (T1110.002) |
| Severity | Informational |
**Description**
Identifies outbound emails that include links to file-sharing services sent externally.
**Attacker's Goals**
Exfiltrate data by sharing a link to a file-sharing service with external recipients, bypassing attachment inspection and potentially evading visibility controls.
**Investigative actions**
* Review the shared URL to determine if the file is publicly accessible or shared outside the organization.
* Check if the file-sharing domain has been previously used by this sender or others in the organization.
* Investigate recent outbound emails for similar use of file-sharing services or unusual external recipients.
Outbound email to external recipient(s) uses first-seen for sender file-sharing service
**Synopsis**
| Field | Value |
| ----------------- | ------------------------------------------------------------------ |
| ATT\&CK Tactic | Execution (TA0002), Credential Access (TA0006) |
| ATT\&CK Technique | User Execution (T1204), Brute Force: Password Cracking (T1110.002) |
| Severity | Informational |
**Description**
Identifies outbound emails that include links to file-sharing services sent externally.
**Attacker's Goals**
Exfiltrate data by sharing a link to a file-sharing service with external recipients, bypassing attachment inspection and potentially evading visibility controls.
**Investigative actions**
* Review the shared URL to determine if the file is publicly accessible or shared outside the organization.
* Check if the file-sharing domain has been previously used by this sender or others in the organization.
* Investigate recent outbound emails for similar use of file-sharing services or unusual external recipients.
---
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