Email was received from an unknown sender using a disposable domain

Cortex XSIAM Analytics Alert Reference by Alert name

Product
Cortex XSIAM
Last date published
2025-11-12
Category
Analytics Alert Reference
Index by
Alert name

Synopsis

Activation Period

14 Days

Training Period

30 Days

Test Period

N/A (single event)

Deduplication Period

1 Day

Required Data

  • Requires:
    • Microsoft 365 Emails

Detection Modules

Email

Detector Tags

ATT&CK Tactic

ATT&CK Technique

Severity

Low

Description

The email was received from an unknown sender using a disposable email provider, first seen in the organization in the past month.

Attacker's Goals

  • Trick recipients into downloading harmful payloads
  • Aim to gain unauthorized access to the organization's systems.

Investigative actions

  • Check the email address for any unusual spellings, missing letters, or unknown domains.
  • If the message contains attachments or links, scrutinize them for any suspicious indications.
  • Monitor further actions taken, such as file downloads or access to potentially malicious links.