Different focus on spam needed

Posted by   Virus Bulletin on   Apr 16, 2013

What happens before the filter doesn't matter too much.

It is surprisingly difficult to get accurate figures for the amount of spam that is sent globally, yet everyone agrees that the global volume of spam has come down a lot since its peak in late 2008. At the same time, despite some recent small decreases, the catch rates of spam filters remain generally high.

Spam still accounts for a significant majority of all the emails that are sent. A world in which email can be used without spam filters is a distant utopia. Yet, the decline of spam volumes and the continuing success (recent glitches aside) of filters have two important consequences.

The first is that we don't have to fix email. There is a commonly held belief that the existence of spam demonstrates that email (which was initially designed for a much smaller Internet) is somehow 'broken' and that its needs to be replaced by something that is more robust against spam.

Setting aside the Sisyphean task of replacing a tool that is used by billions, proposals for a new form of email tend either to put the bar for sending messages so high as to prevent many legitimate senders from sending them, or break significant properties of email (usually the ability to send messages to someone one hasn't had prior contact with).

Still, if spam volumes had continued to grow, we would have had little choice but to introduce a sub-optimal replacement. The decline in spam volumes means we don't have to settle for such a compromise.

Secondly, current levels of spam mean there is little threat of a constant flow of spam causing mail servers to fall over.

At the same time, one would be hard-pressed to find a user whose email is not filtered somewhere - whether by their employer, their provider, or their mail client.

Thus, looking at the spam that is sent isn't particularly interesting as it provides us with little insight into the actual problem. What matters is that small minority of emails that do make it to the user - whether because their spam filter missed it, or because they found it in quarantine and assumed it had been blocked by mistake.

Equally important is the question of which legitimate emails are blocked, and why - and what can be done to prevent this from happening again in the future.

It is tempting to look at all the spam received by a spam trap, or by a mail server, and draw conclusions from that. They certainly help paint a picture, but in the end they say as much about what users see as the number of shots on target in a football match says about the final result.

Despite the doom predicted by some a decade ago, email is still with us - and we have won a number of important battles against spam. But if we want to win the war, we need to shift our focus.

This Friday (19th May) I will give a talk in Athens, Greece on the current state of spam. The talk is organised by the local ISACA and OWASP chapters.

Posted on 16 April 2013 by Martijn Grooten

twitter.png
fb.png
linkedin.png
hackernews.png
reddit.png

 

Latest posts:

VB2018 paper: Lazarus Group: a mahjong game played with different sets of tiles

The Lazarus Group, generally linked to the North Korean government, is one of the most notorious threat groups seen in recent years. At VB2018 ESET researchers Peter Kálnai and Michal Poslušný presented a paper looking at the group's various…

Book your VB2019 ticket now for a chance to win a ticket for BSides London

Virus Bulletin is proud to sponsor this year's BSides London conference, which will take place next week, and we have a number of tickets to give away.

First 11 partners of VB2019 announced

We are excited to announce the first 11 companies to partner with VB2019, whose support will help ensure a great event.

VB2018 paper: Fake News, Inc.

A former reporter by profession, Andrew Brandt's curiosity was piqued when he came across what appeared at first glance to be the website of a small-town newspaper based in Illinois, but under scrutiny, things didn’t add up. At VB2018 he presented a…

Paper: Alternative communication channel over NTP

In a new paper published today, independent researcher Nikolaos Tsapakis writes about the possibilities of malware using NTP as a covert communication channel and how to stop this.

We have placed cookies on your device in order to improve the functionality of this site, as outlined in our cookies policy. However, you may delete and block all cookies from this site and your use of the site will be unaffected. By continuing to browse this site, you are agreeing to Virus Bulletin's use of data as outlined in our privacy policy.