Usage of homograph characters detected in an email attachment(s) name

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	1 Day
Required Data	Microsoft 365 Emails
Detection Modules	Email
Detector Tags	Evasion, Phishing
ATT&CK Tactic	Execution (TA0002), Credential Access (TA0006)
ATT&CK Technique	User Execution (T1204), Brute Force: Password Cracking (T1110.002)
Severity	Informational

Description

Detected characters resembling Latin letters within an email attachment(s) name. This method could be used as a method to evade text or file scanners and analyzers.

Attacker's Goals

Evade file scanner defenses, tricking recipients into running malicious attachments.

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.
• Check the domain the email came from, and if this domain is recognized within the organization.
• Scrutinize the attachments related to the email message.
• Monitor file-related actions taken related to the attachment.

Variations

Usage of homograph characters detected in an email attachment(s) extension

Synopsis

Field	Value
ATT&CK Tactic	Execution (TA0002), Credential Access (TA0006)
ATT&CK Technique	User Execution (T1204), Brute Force: Password Cracking (T1110.002)
Severity	Low

Description

Detected non-latin characters within an email attachment's extension(s). Detected characters resembling Latin letters within an email attachment(s) name. This method could be used as a method to evade text or file scanners and analyzers.

Attacker's Goals

Evade file scanner defenses, tricking recipients into running malicious attachments.

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.
• Check the domain the email came from, and if this domain is recognized within the organization.
• Scrutinize the attachments related to the email message.
• Monitor file-related actions taken related to the attachment.