directory harvest attack


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directory harvest attack

A method spammers use to obtain valid email addresses. Random names are generated and sent out to valid domains. If an undeliverable message does not return, the name is assumed to be genuine. Random names are easy to generate from any electronic phone book because many organizations standardize on conventions such as first name letter and last name or first name and last name letter; for example, John Doe could be jdoe@xyz.com or johnd@xyz.com.
References in periodicals archive ?
In April, the service made its biggest impact when it detected the directory harvest attack. After receiving Oaks' call, a mailMAX engineer recognized the signs of the attack, a scenario where spammers send tens of thousand of blank e-mails to every possible combination of user names at a particular company.
The USPTO has deployed the MailGate products to block viruses, spam, phishing attacks and 'Dark Traffic' including e-mail-based threats such as e-mail denial of service (DoS) attacks and directory harvest attacks (DHA).
Tumbleweed said Dark Traffic, which includes e-mail DoS attacks, Directory Harvest Attacks (DHA), malformed SMTP packets and invalid recipient addresses, accounted for 83% of the inbound e-mail network traffic processed by enterprises from July through to September 2005.
McAfee Secure Messaging Services combine McAfee's and Postini's security expertise, providing customers with a solution that offers automatic and proactive e-mail protection against spam, phishing, viruses, inappropriate content, denial of service attacks and directory harvest attacks, the company claims.
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