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Phishing and Intrusion Prevention

Phishing and Intrusion Prevention. Tod Beardsley, TippingPoint (a division of 3Com), 02/15/06 – IMP-201. The Phishing Campaign. Mail Drop Service. Phisher. Victim Web Server. Victim Users.

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Phishing and Intrusion Prevention

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  1. Phishing and Intrusion Prevention Tod Beardsley,TippingPoint (a division of 3Com),02/15/06 – IMP-201

  2. The Phishing Campaign Mail Drop Service Phisher Victim Web Server Victim Users • Phishers leverage social engineering, technical trickery, and a number of protocols harvest personal financial data and account information. Retrieves stolen information Compromises a host and installs a phish Web site and mass mailer Information Transmitted to Drop Sends out phishing e-mail Victim clicks a phish URL Phish Web site is viewed Victim submits information

  3. Point Defense • E-mail (SMTP) Defenses • Monitor SMTP for suspicious e-mail messages, very similar to existing anti-spam solutions. • Problematic when dealing with extremely terse messages, or messages designed specifically to evade anti-spam. • Web (HTTP) Defenses • Usually depend on blacklists of IP addresses. • Sometimes, evaluate content to score for phishiness. • PC Anti-Virus • Not helpful when malware is not involved (and it’s usually not).

  4. Social Defense • User Education • The victim is attacked while in a vulnerable emotional state. • Phishing e-mail uses fear and anxiety very effectively. • Normal customer service mail is already misleading. • HTML markup, image tags, and redirects are common. • A common misunderstanding of SSL has all but ruined SSL as a protective mechanism. • Legislative Remedies • Perpetrators are often outside the victim’s jurisdiction. • Crime can go undetected for weeks, months, or years.

  5. Network Defense through Intrusion Prevention • Initial Web Site Compromise • TippingPoint IPS protects vulnerabilities in Web sites and servers • 2. Mass Phishing E-Mail • TippingPoint IPS utilizes behavior-based filters, content inspection, and pattern-matching signatures to block • Victim Clicks on Misleading URL • The URL itself and the corresponding DNS query is evaluated to determine if it is linking to a legitimate or fraudulent site • 4. Phish Web Site is Displayed • Web site is evaluated for exploited vulnerabilities. IPS inspects Web content and uses behavior-based filters for signs of forgery. • 5. Victim Submits Account Information • If information is submitted to a suspected phishing site, the IPS will block the information transfer. Phisher 1 Compromises a host and installs a phish Web Site and mass mailer 2 Sends out phishing e-mail 3 Victim clicks a phish URL 4 Phish Web site is viewed Victim Web Server 5 Victim submits information Victim Users

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