Classification:

attack

Tactic:

TA0001-initial-access

Technique:

T1566-phishing

VIEW RULE IN DATADOG VIEW SIGNALS

Set up the mimecast integration.

Goal

To detect and alert when an email contains a malicious URL, potentially indicating a phishing attempt or other security threat.

Strategy

This rule identifies emails transiting through the organization’s email gateway that contain URLs classified as malicious under a ttp definition {{@ttpDefinition}}. These URLs may be part of phishing campaigns, malware distribution, or other malicious activities.

Triage and response

1. Investigate the email source and content, focusing on the sender’s IP address: {{@senderIPAddress}}.
2. Check the URL against known threat databases and analyse the email for other indicators of compromise.
3. Follow the organization’s incident response protocol, which may include:
   • Isolating the email to prevent further spread.
   • Notifying affected users and guiding them on how to proceed.
   • Updating security filters to catch similar future attempts.