Adversaries may send spearphishing messages with a malicious attachment to elicit sensitive information that can be used during targeting. Spearphishing for information is an attempt to trick targets into divulging information, frequently credentials or other actionable information. Spearphishing for information frequently involves social engineering techniques, such as posing as a source with a reason to collect information (ex: Establish Accounts or Compromise Accounts) and/or sending multiple, seemingly urgent messages.
All forms of spearphishing are electronically delivered social engineering targeted at a specific individual, company, or industry. In this scenario, adversaries attach a file to the spearphishing email. In some cases, they may rely upon the recipient populating information, then returning the file.(Citation: Sophos Attachment)(Citation: GitHub Phishery) The text of the spearphishing email usually tries to give a plausible reason why the file should be filled-in, such as a request for information from a business associate. In other cases, adversaries may leverage techniques such as HTML Smuggling to harvest user credentials via fake login portals.(Citation: Huntress HTML Smuggling 2024)
Adversaries may also use information from previous reconnaissance efforts (ex: Search Open Websites/Domains or Search Victim-Owned Websites) to craft persuasive and believable lures.
Detection of Spearphishing Attachment
User Training: User Training involves educating employees and contractors on recognizing, reporting, and preventing cyber threats that rely on human interaction, such as phishing, social engineering, and other manipulative techniques. Comprehensive training programs create a human firewall by empowering users to be an active component of the organization's cybersecurity defenses. This mitigation can be implemented through the following measures:
Create Comprehensive Training Programs:
Use Simulated Exercises:
Leverage Gamification and Engagement:
Incorporate Security Policies into Onboarding:
Regular Refresher Courses:
Emphasize Real-World Scenarios:
Software Configuration: Software configuration refers to making security-focused adjustments to the settings of applications, middleware, databases, or other software to mitigate potential threats. These changes help reduce the attack surface, enforce best practices, and protect sensitive data. This mitigation can be implemented through the following measures:
Conduct a Security Review of Application Settings:
Implement Access Controls and Permissions:
Enable Logging and Monitoring:
Update and Patch Software Regularly:
Disable Unnecessary Features or Services:
Test Configuration Changes:
Tools for Implementation
Configuration Management Tools:
Security Benchmarking Tools:
Vulnerability Management Solutions:
Logging and Monitoring Tools: