Email Bombing

T1667

Technique.View on attack.mitre.org

About this technique

Adversaries may flood targeted email addresses with an overwhelming volume of messages. This may bury legitimate emails in a flood of spam and disrupt business operations.

An adversary may accomplish email bombing by leveraging an automated bot to register a targeted address for e-mail lists that do not validate new signups, such as online newsletters. The result can be a wave of thousands of e-mails that effectively overloads the victim’s inbox.

By sending hundreds or thousands of e-mails in quick succession, adversaries may successfully divert attention away from and bury legitimate messages including security alerts, daily business processes like help desk tickets and client correspondence, or ongoing scams. This behavior can also be used as a tool of harassment.

This behavior may be a precursor for Spearphishing Voice. For example, an adversary may email bomb a target and then follow up with a phone call to fraudulently offer assistance. This social engineering may lead to the use of Remote Access Software to steal credentials, deploy ransomware, conduct Financial Theft, or engage in other malicious activity.

Detection rules0

Rules on DetectionCode tagged with T1667.

Sigma0

No Sigma rules are mapped to this technique yet.

Splunk0

No Splunk rules are mapped to this technique yet.

Groups1

Software0

None recorded.

Campaigns0

None recorded.

Procedure examples1

Groups1

Used byProcedure example
GroupStorm-1811

Storm-1811 has deployed large volumes of non-malicious email spam to victims in order to prompt follow-on interactions with the threat actor posing as IT support or helpdesk to resolve the problem.

References4

  1. hhs-email-bombing Open source
    U.S. Department of Health and Human Services. (2024, March 12). Defense and Mitigations from E-mail Bombing. Retrieved January 31, 2025.
  2. krebs-email-bombing Open source
    Brian Krebs. (2016, August 18). Massive Email Bombs Target .Gov Addresses. Retrieved January 31, 2025.
  3. rapid7-email-bombing Open source
    Tyler McGraw, Thomas Elkins, and Evan McCann. (2024, May 10). Ongoing Social Engineering Campaign Linked to Black Basta Ransomware Operators. Retrieved January 31, 2025.
  4. sophos-bombing Open source
    Mark Parsons, Colin Cowie, Daniel Souter, Hunter Neal, Anthony Bradshaw, Sean Gallagher. (2025, January 21). Sophos MDR tracks two ransomware campaigns using “email bombing,” Microsoft Teams “vishing”. Retrieved January 31, 2025.

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