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XSS to TSS: tech support scam campaign abuses cross-site scripting vulnerability

Tech support browser lockers continue to be one of the most common web threats. Not only are they a problem for end users who might end up on the phone with scammers defrauding them of hundreds of dollars, they’ve also caused quite the headache for browser vendors to fix. Browser lockers are only one element of a bigger plan to redirect traffic from certain sites, typically via … [Read more...]

New web skimmer steals credit card data, sends to crooks via Telegram

The digital credit card skimming landscape keeps evolving, often borrowing techniques used by other malware authors in order to avoid detection. As defenders, we look for any kind of artifacts and malicious infrastructure that we might be able to identify to protect our users and alert affected merchants. These malicious artifacts can range from compromised stores to malicious JavaScript, … [Read more...]

SBA phishing scams: from malware to advanced social engineering

A number of threat actors continue to take advantage of the ongoing coronavirus pandemic through phishing scams and other campaigns distributing malware. In this blog, we look at a specific organization, namely the US Small Business Administration (SBA), and how threat actors have been impersonating it in a number of phishing attempts targeted at business owners, CEOs, and CFOs. GuLoader … [Read more...]

Inter skimming kit used in homoglyph attacks

As we continue to track web threats and credit card skimming in particular, we often rediscover techniques we’ve encountered elsewhere before. In this post, we share a recent find that involves what is known as an homoglyph attack. This technique has been exploited for some time already, especially in phishing scams with IDN homograph attacks. The idea is simple and consists of using … [Read more...]

Malspam campaign caught using GuLoader after service relaunch

They say any publicity is good publicity. But perhaps this isn’t true for CloudEye, an Italian firm that claims to provide “the next generation of Windows executables’ protection”. First described by Proofpoint security researchers in March 2020, GuLoader is a downloader used by threat actors to distribute malware on a large scale. In June, CloudEye was exposed by … [Read more...]

Credit card skimmer targets ASP.NET sites

Cybercriminals typically focus on targets that can get them the highest return with the least amount of effort. This is often determined by their ability to scale attacks, and therefore on how prevalent a vulnerability or target system is. Enter: the credit card skimmer. In the world of digital skimming, we’ve seen the most activity on e-commerce content management systems (CMSes), such … [Read more...]

Credit card skimmer masquerades as favicon

Malware authors are notorious for their deceptive attempts at staying one step ahead of defenders. As their schemes get exposed, they always need to go back to their bag of tricks to pull out a new one. When it comes to online credit card skimmers, we have already seen a number of evasion techniques, some fairly simple and others more elaborate. The goal remains to deceive online shoppers while … [Read more...]

Online credit card skimming increased by 26 percent in March

Criminals are known to take advantage of events that capture people’s attention. This is true for any kind of attack that relies on social engineering, such as the phishing emails exploiting the Covid-19 pandemic. Certain events such as the current crisis not only get the attention of threat actors but they also lead to changes in habits. Case in point, with the confinement measures … [Read more...]

Criminals hack Tupperware website with credit card skimmer

On March 20, Malwarebytes identified a targeted cyberattack against household brand Tupperware and its associated websites that is still active today. We attempted to alert Tupperware immediately after our discovery, but none of our calls or emails were answered. Threat actors compromised the official tupperware[.]com site—which averages close to 1 million monthly visits—as well as a few of its … [Read more...]