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Monitor Email For Brand Abuse

The following analytic identifies emails claiming to be sent from a domain similar to one you are monitoring for potential abuse. It leverages email header data, specifically the sender's address, and cross-references it with a lookup table of known domain permutations generated by the "ESCU - DNSTwist Domain Names" search. This activity is significant as it can indicate phishing attempts or brand impersonation, which are common tactics used in social engineering attacks. If confirmed malicious, this could lead to unauthorized access, data theft, or reputational damage.

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Detection Logic

| tstats `security_content_summariesonly` values(All_Email.recipient) as recipients, min(_time) as firstTime, max(_time) as lastTime 
FROM datamodel=Email
  BY All_Email.src_user, All_Email.message_id
| `drop_dm_object_name("All_Email")`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| eval temp=split(src_user, "@")
| eval email_domain=mvindex(temp, 1)
| lookup update=true brandMonitoring_lookup domain as email_domain OUTPUT domain_abuse
| search domain_abuse=true
| table message_id, src_user, email_domain, recipients, firstTime, lastTime
| `monitor_email_for_brand_abuse_filter`

False Positives

⚠ No false positives have been identified at this time.

Field Validations

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