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Tag: botnet

Malicious email terms defined.

Legitimate mailers need to distinguish themselves from spammers. One important piece of that is knowing what spammers do. SendGrid has put together some information on common scams and techniques spammers use to get email delivered. Some of these terms, like doxxing and swatting, are not specifically email related. However, they are used against people who […]

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Botnet herder / spam kingpin arrested

Via Krebs on Security, a russian named Pyotr Levashov has been arrested in Spain. According to news reports (NY Times, Reuters) the arrest happened in response to a warrant issued by the US, but no details were given as to what he was being charged with. The DoJ says the case is currently under seal and will […]

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March 2017: The Month in Email

It’s that time again… here’s a look at our last month of blog posts. We find it useful to recap each month, both to track trends and issues in email delivery and to provide a handy summary for those who aren’t following along breathlessly every single day. Let us know if you find it useful […]

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What about the botnets?!

Botnets are a huge problem for a number of reasons. Not only are they used to send spam, they’re also used in criminal activities. One of the major challenges in dealing with botnets is finding and stopping the people who create and use them. Why? Because the internet is global and crime tends to be […]

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Following the SMTP rules

An old blog post from 2013, that’s still relevant today. “Blocked for Bot-like Behavior” An ESP asked about this error message from Hotmail and what to do about it. “Bot-like” behaviour usually means the sending server is doing something that bots also do. It’s not always that they’re spamming, often it’s a technical issue. But […]

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Port25 blocking

A number of hosting providers are blocking outgoing port25. This has implications for a lot of smaller senders who either want to run their own mail server or who use SMTP to send mail to their ESP. What is port25 Port25 is the designated email sending channel. Much like websites are on port80 (or 8080) […]

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CASL botnet take down

The CRTC served its first ever warrant as part of an international botnet takedown. The warrant was to take down a C&C (command and control) server for Win32/Dorkbot. International efforts to take down C&C servers take a lot of effort and work and coordination. I’ve only ever heard stories from folks involved but the scale […]

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What happened with the CBL false listings?

The CBL issued a statement and explanation for the false positives. Copying it here because there doesn’t seem to be a way to link directly to the statement on the CBL front page. November 24, 2015 Widespread false positives Earlier today, a very large scale Kelihos botnet event occured – by large scale, many email installations […]

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Increase in CBL listings

Update: As of Nov 24, 2015 11:18 Pacific, Spamhaus has rebuilt the zone and removed the broken entries. Expect the new data to propagate in 10 – 15 minutes. Delivery should be back to normal. The CBL issued a statement, which I reposted for readers that find this post in the future. I think it’s […]

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Are botnets really the spam problem?

Over the last few years I’ve been hearing some people claim that botnets are the real spam problem and that if you can find a sender then they’re not a problem. Much of this is said in the context of hating on Canada for passing a law that requires senders actually get permission before sending email. […]

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