Synopsis
Activation Period |
14 Days |
Training Period |
30 Days |
Test Period |
10 Minutes |
Deduplication Period |
1 Hour |
Required Data |
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Detection Modules |
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Detector Tags |
Exfiltration |
ATT&CK Tactic |
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ATT&CK Technique |
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Severity |
Informational |
Description
Numerous emails with substantial attachments sent by an internal sender to one or more external recipients within a short timeframe.
Attacker's Goals
- Extracting valuable information outside the company.
- Bypass Data Loss Prevention (DLP) by splitting data across multiple emails.
Investigative actions
- Check the content of the email that were sent.
- Review the external recipient address and assess its reputation.
- Review past emails sent from this mailbox for any suspicious activity.
- Check for unusual emails sent to this recipient's address.
- Monitor further action taken, such as accessing to private keys, API tokens and sensitive data.
Variations
Unusual attachment volume in outbound emails to a single external recipientUnusual attachment amount and size in outbound emails