Fast Facts
- Legacy reputation scoring based on domain age is increasingly unreliable, allowing sophisticated attackers to exploit aged domains withclean histories to bypass filters.
- Attackers can acquire aged domains through drop-catch services or hijack active domains via credential theft, enabling them to host malicious content with reputations that appear legitimate.
- Long-term certificate histories of compromised domains can mislead security systems, allowing malicious subdomains to appear trustworthy and infiltrate enterprise email defenses.
The Threat, Attack Techniques, and Targets
The threat involves cyber operators using aged domains to carry out phishing attacks. These attackers acquire domains that look legitimate because they have a history of stable hosting and consistent certificate issuance. They often do this by drop-catching expired domains or hijacking active ones through credential theft. Once they gain control, they reconfigure the domains to serve malicious purposes. This tactic helps them bypass email filters that rely heavily on domain age as a risk indicator. The targets are mostly enterprise organizations that use email security solutions from vendors like Microsoft, Proofpoint, Mimecast, or Cisco. Despite strong security measures, these organizations still see phishing lures land in user inboxes. The used domains appear trustworthy because they have long, stable histories. However, the criminals behind the attacks are exploiting the reputation system to deceive email filters.
Impact, Security Implications, and Remediation Guidance
This technique can cause serious security issues. Phishing emails can reach users despite advanced filters. This might lead to data theft or malware infections. The impact is increased risk for organizations and their users. Currently, many mail filters are ineffective against this tactic because they rely on domain age. This creates a blind spot in security. To fix this problem, organizations should seek advice from their email security vendors or trusted cybersecurity authorities. They can provide specific guidance on how to update detection methods. Improving filtering techniques can help identify suspicious domains that have appeared recently but possess a long, seemingly trustworthy history.
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