Classification:

attack

Tactic:

TA0005-defense-evasion

Technique:

T1036-masquerading

VIEW RULE IN DATADOG VIEW SIGNALS

Goal

Detects when emails containing malware attachments are received from an external sender, which may indicate a malware distribution campaign or a compromised sender attempting to spread malicious payloads.

Strategy

This rule monitors inbound emails and raises an alert when emails with malware attachments originate from an external sender, suggesting a targeted attack or widespread malware distribution.

Triage and Response

1. Review the sender email address {{@event.entity.entity_payload.from_email}} and analyze the malware attachments.
2. Quarantine or delete the detected emails to prevent users from opening malicious attachments.
3. Notify affected users and begin a security incident response process to investigate engagement with attachment and endpoint activity.