The increasing number of "whaling" attacks, usually targeting an organization's senior management, means additional protection is required against email threats that do not contain attachments or URLs. Traditional spam filtering systems are unable to detect these as suspicious, due to their minimal content. Targeted Threat Protection - Impersonation Protect solves this, by:
- Looking for combinations of key identifiers commonly found in these attacks.
- Tagging a message to make it clear that it is coming from outside your organization.
In the Impersonation Protection Definition, you can specify the number of identifiers that must be triggered before any action is taken. The available identifiers are:
- Similar Internal Domain: This checks the similarity of the sender's domain to your internal domains.
- Newly Observed Domain: This checks the sender's domain against a list of domains that have been seen sending traffic in the last week. This means it can include domains created at any time (e.g. those created but previously dormant).
- Internal User Name: This identifies if the sender's display name (usually the first and last name), is the same as one of your internal user display names, excluding the recipient’s internal username.
- Reply to Address Mismatch: This identifies if a mismatch has occurred between the sender’s email address (both Header and Envelope) and the Reply To email address.
- Targeted Threat Dictionary: This checks the message content against a one of our Targeted Threat Dictionaries.
Based on whether the required number of identifiers is triggered, you can specify the action to take if an email is identified as suspicious. The action can be:
Additionally, you can help users identify all messages as coming from an external domain regardless of whether any identifiers are triggered. This takes the form of text that can be added to a message's: