Large Upload (SMTP)

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	1 Day
Deduplication Period	1 Day
Required Data	Requires one of the following data sources: Palo Alto Networks Firewall traffic Logs OR XDR Agent OR Third-Party Firewalls
ATT&CK Tactic	Exfiltration (TA0010)
ATT&CK Technique	Exfiltration Over Alternative Protocol (T1048)
Severity	Low

Description

The endpoint, which is not an internal SMTP server, emailed an excessive amount of data from your network.

Attacker's Goals

Transfer data they have stolen from your network to a location that is convenient and useful to him.

Investigative actions

• Identify the process/user performing the data transfer to determine if the transfer is sanctioned.
• Verify that the source is not a mail server.
• Check if the target address represents a mail service that rarely used in the organization. If so, this might indicate on file exfiltration attempt.

Variations

Large Upload (SMTP)

Synopsis

Field	Value
ATT&CK Tactic	Exfiltration (TA0010)
ATT&CK Technique	Exfiltration Over Alternative Protocol (T1048)
Severity	Informational

Description

The endpoint, which is not an internal SMTP server, emailed an excessive amount of data from your network.

Attacker's Goals

Transfer data they have stolen from your network to a location that is convenient and useful to him.

Investigative actions

• Identify the process/user performing the data transfer to determine if the transfer is sanctioned.
• Verify that the source is not a mail server.
• Check if the target address represents a mail service that rarely used in the organization. If so, this might indicate on file exfiltration attempt.