Incidents

Internationalized Domain Names used to spread malware

As we published last year, the first Internationalized domain names (IDN) using non-Latin characters appeared on the internet; these contain characters from Cyrillic, Arabic and other languages. We also started to see some news domains using diacritics such as “, , , , , , , , , , , , , “ in their names, or accents, for instance as seen in http://amarylliscomunicao.com.br.

It’s also important to point that some browsers and mail readers aren’t prepared to show these characters correctly. A domain in Arabic such as http://وزارة-الأتصالات.مصر/ might be shown as http://xn--4gbrim.xn—-ymcbaaajlc6dj7bxne2c.xn--wgbh1c in your mailbox. We call this alternate way to show non-latin characters punycode.

During our regular monitoring of malicious activities in Brazil, we discovered an interesting and legitimate URL shortener service which is using the diacritics “.” in his name:

URL shortener service using diacritic symbol

And everybody knows that cybercriminals love to use URL shortener services. In this case, there’s no exception – various Brazilian bad guys started to use this service to decrease the size of URLs in phishing messages and also to rise the curiosity of users, presenting a URL with accents:

Malicious e-mail using a link with diactric symbol

The message above shows a link pointing to a very common Brazilian trojan banker detected as Trojan-Downloader.Win32.Delf.bbwp.

So, when receiving e-mail messages, be careful with short links, even those showing odd accents and non-latin characters!

Internationalized Domain Names used to spread malware

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Reports

The leap of a Cycldek-related threat actor

The investigation described in this article started with one such file which caught our attention due to the various improvements it brought to this well-known infection vector.

Lazarus targets defense industry with ThreatNeedle

In mid-2020, we realized that Lazarus was launching attacks on the defense industry using the ThreatNeedle cluster, an advanced malware cluster of Manuscrypt (a.k.a. NukeSped). While investigating this activity, we were able to observe the complete life cycle of an attack, uncovering more technical details and links to the group’s other campaigns.

Sunburst backdoor – code overlaps with Kazuar

While looking at the Sunburst backdoor, we discovered several features that overlap with a previously identified backdoor known as Kazuar. Our observations shows that Kazuar was used together with Turla tools during multiple breaches in past years.

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