If you’ve been paying attention to computer security, you already know that spam, viruses, and organized crime have been in bed together for at least a year. The recently-discovered theft of 40 million credit card numbers [edit: originally linked to Yahoo News] illustrates this point clearly:

CardSystems was hit by a virus-like computer script that captured customer data for the purpose of fraud, [MasterCard spokeswoman] Gamsin said. She said she did not know how the script got into the system. The FBI was investigating. (emphasis added)

Given the current porous state of many networks and operating systems, and the general public’s attitude that catching a computer virus is as inevitable as catching a cold, I’d guess it got into the system the same way most spyware does. An email attachment squeaked by the filters. Someone installed a tool that claimed it would make their web access faster. Someone got a well-designed phish, followed the link, and got infected by a backdoor because their browser was behind on security patches. Someone brought a laptop home, plugged it into their insecure home network, and brought back a virus.

Sadly, I expect we’ll be seeing a lot more of this.

Update June 20: Netcraft is reporting that it was indeed lax computer security that did them in:

MasterCard International said it “worked with CardSystems to remediate the security vulnerabilities in the processor’s systems. These vulnerabilities allowed an unauthorized individual to infiltrate their network and access the cardholder data.” Officials at affected institutions were not specifying the vulnerability and exploit used to breach CardSystems’ security. (emphasis added)

Netcraft seems to think it was likely their website, which runs on Windows 2000 and IIS 5, and they go on to promote their own security consulting services. So it’s not entirely an unbiased look at the incident.

Over the last few days, one of the viruses going around (probably a Mytob variant) has been trying to send its “Your account is being suspended! Open this file now!” come-ons. It forges the return address as support@example.net, admin@example.net, etc. We block any incoming mail using these addresses before it even gets to our virus scanner.

Now here’s the weird part. We’re also getting bounces sent to another domain we manage, let’s say another-example.com. Both sets are coming from someserver.another-example.com.br!

I think that the virus is finding itself on another-example.com.br and not recognizing the country-specific domain name, misreading it as just another-example.com. It then looks up the mail server, finds our domain, and targets both.
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Mozilla developer Ben Goodger writes about losing his inbox to the latest virus… despite not using any vulnerable software. Apparently he’s been getting over 10,000 virus-laced messages every day, and with the four-day weekend they built up to the point that Thunderbird wasn’t able to handle the influx. (Imagine having to filter out 770 megabytes of junk every day, and having that build up over several days.)

Sure, the the pre-release Thunderbird still has problems dealing with very large folders, but 770 MB/day? Even Gmail only gives you 1 GB of total storage. I can’t think of any reasonable expectation that any mail client should have to deal with that at today’s level of data richness. Maybe in the future when we’re sending full-motion video on a regular basis, but not when most email is text with maybe some formatting and a couple of small images.

It’s just staggering that, even though the main email worms depend on Microsoft Outlook, Outlook Express, and Internet Explorer to spread themselves and infect new hosts, they can still damage systems that don’t use those programs!