Rules: Blocked Email Message
An SMTP server sent a reply mentioning an SMTP block list.
| Detail | Value |
|---|---|
| Type | Match |
| Category | Initial Access |
| Apply Risk to Entities | srcDevice_ip |
| Signal Name | Blocked Email Message |
| Summary Expression | Blocked Email message from {{srcDevice_ip}} |
| Score/Severity | Static: 2 |
| Enabled by Default | True |
| Prototype | False |
| Tags | _mitreAttackTactic:TA0001, _mitreAttackTactic:TA0043, _mitreAttackTechnique:T1566, _mitreAttackTechnique:T1566.001, _mitreAttackTechnique:T1566.002, _mitreAttackTechnique:T1598, _mitreAttackTechnique:T1598.002, _mitreAttackTechnique:T1598.003 |
| Origin | Field |
|---|---|
| Normalized Schema | metadata_deviceEventId |
| Normalized Schema | metadata_product |
| Normalized Schema | srcDevice_ip |
| Normalized Schema | threat_name |