Suspicious brand affiliation detected

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	Brand Impersonation
ATT&CK Tactic	Stealth (TA0005)
ATT&CK Technique	Social Engineering: Impersonation (T1684.001)
Severity	Informational

Description

The sender's name or address suggests association with a recognized brand, but the email address doesn't match established patterns for that brand.

Attacker's Goals

Trick the user on clicking the link, while avoiding detection.

Investigative actions

• Examine the sender's IP address and reputation.
• Verify whether the sender's IP address has appeared in different log sources before and if it is recognizable.
• 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.