1 / 11

Spam

Victor Ivanov. Spam. Introduction. Definition Unsolicited bulk messages Concerns Server load Garbage content. Types of spam. Email, IM, Skype and such Search index spam (doorways and stuff) Site spam ( guestbooks , blog comments, forums, soc.nets , etc ). Email spam.

portia
Download Presentation

Spam

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Victor Ivanov Spam

  2. Introduction • Definition • Unsolicited bulk messages • Concerns • Server load • Garbage content

  3. Types of spam • Email, IM, Skype and such • Search index spam (doorways and stuff) • Site spam (guestbooks, blog comments, forums, soc.nets, etc)

  4. Email spam • 85-97% of all emails • Some techniques • Image spam • Blank spam • Bill Gates receives four million e-mails per year, most of them spam • Servers forward, receive and store unnecessary data

  5. Search index spam • Doorways • Short-lived sites made for traffic collection • Traffic is sold to partner programs • Doorways for Google are often spammed further • Doorway elements • Sections of valid sites that are made to attract traffic to inexistent content • E.g. “product reviews”, be the first • This kind of spam does not directly affect any server resources (except Google’s ones), but is connected to other spam

  6. Site spamming • Most often, the purpose is supporting doorways • Guestbooks, forums, etc. that have no or weak CAPTCHAs are common victims • Some intelligent tools to spam • Xrumer (around $600) • Spammers can overwhelm small sites even if they can’t break through defenses

  7. How do we fight spam?

  8. Email spam countermeasures • IP filtering • Restrictions on bulk email sending • Heuristic analysis of each message

  9. How to fight site spam • CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) • Must be either unique or updated regularly • Heuristic analysis • Remote option example - Mollom.com • Rejecting comments with either “[URL=” or “<a href=” in them

  10. What we can do about index spam • Improve index filtering • Fight site spamming

  11. Conclusion • Spam is bad for server resources • Heuristics, blacklisting and CAPTCHAs are used to block spam

More Related