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Intelligence Briefings from the War on Spam

Archive for the ‘Cloudmark’ Category

Spammers Tap Regional Operators to Send SMS Spam from U.S. To Malaysia and Mexico


Thursday, March 27, 2014 by Jason

Cloudmark has observed that in some cases different categories of SMS spammers target different types of US Regional Mobile Operators, also known as tier 2 or tier 3 operators. Mobile operators are divided into different tiers depending on whether they fully own the network that they use to deliver voice and data services (tier 1), […]

The good news is you don’t have cancer…


Monday, March 17, 2014 by Andrew Conway

…the bad news is that if you tried to see your diagnosis you just installed a trojan on your system which stole your credit card number and bank account login. A recent spam attack in the UK pretends to be a notification from the National Institute for Health and Care Excellence (NICE) saying that you […]

RSA Conference: Android in the Enterprise and the Future of Mobile Threats


Thursday, February 27, 2014 by Andrew Conway

On Tuesday I had the privilege to lead a peer to peer discussion at the RSA convention entitled Android in the Enterprise and the Future of Mobile Threats. My role as moderator was to ask questions rather then provide answers. I ended up learning a lot in the session, so I would regard it as […]

Go Phish, for Bank Cards


Tuesday, February 25, 2014 by Tom Landesman

With the New Year, it appears SMS scammers in the U.S. have taken a renewed interest in bank and account phishing mobile users. In January alone, more than half of all SMS spam reported via the GSMA Spam Reporting Service within the US were phishing attempts. From targeting prepaid debit cards for Child Support Recipients […]

SMS Phishers Exploit Twilio and ow.ly to Steal Mobile Account Logins


Thursday, February 13, 2014 by Mike Acar

Via the GSMA Spam Reporting Service, we’ve been receiving reports of an SMS phishing attack aimed at the customers of several large mobile providers in the US. And in an unusual twist, the phishers are trying to evade anti-abuse services by showing their malicious content only to mobile users. More than a quarter of a million mobile users. The […]

Guatemalan scammers taking lessons from Nigeria?


Thursday, February 06, 2014 by Emmet Cassidy

When it comes to exports and Guatemala, we generally think coffee. However, while poring over our Mobile messaging data, we discovered another Guatemalan export: Nigerian-style scam campaigns. Over the past two to three years, mobile phone users in the USA have been receiving SMS messages, originating in Guatemala, informing them that they have won a […]

Will Yahoo Mail data be used for Phishing?


Friday, January 31, 2014 by Angela Knox

Yahoo Mail announced a security attack yesterday where they observed hackers had been logging into peoples’ Yahoo email accounts using usernames and passwords that appeared to come from a third party who had access to this information. A Yahoo news article said that “A malicious computer program armed with Yahoo Mail passwords and usernames apparently […]

The Underused Unsubscribe


Wednesday, January 08, 2014 by Andrew Conway

Feedback from users is an important part of Cloudmark’s spam filtering (along with spam traps, a policy engine, and other goodies.) Even with the best of spam filters, sometimes a new type of spam message makes it through to an end user’s inbox. However, if they are at one of our clients and they click […]

Snapchat Exploit Leads to 4.6 Million Exposed Records


Friday, January 03, 2014 by Tom Landesman

Snapchat may have had less than a happy New Year thanks to the authors of SnapchatDB.info. The site, released on December 31, features approximately 4.6 million Snapchat users’ username, phone number, and area-code-derived geographical region. These records were collected using an exploit published by Gibson Security who has been exploring the undocumented Snapchat API for […]

Ten Years of CAN-SPAM


Thursday, January 02, 2014 by Andrew Conway

January 1st, 2014 marked the 10th anniversary of the CAN-SPAM Act taking force in the US. This laid down rules for bulk emailing, and provided criminal penalties for breaking them. The act was widely criticized at the time, as it still permitted unsolicited bulk emailing so long as a prior business relationship existed. In fact, […]


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