Rotexy Android Trojan Banker and Ransomware

In a three-month period from August to October 2018, it launched over 70,000 attacks against users located primarily in Russia. An interesting feature of this family of banking Trojans is the simultaneous use of three command sources:

Google Cloud Messaging (GCM) service – used to send small messages in JSON format to a mobile device via Google servers;
malicious C&C server;
incoming SMS messages.

It spreads under the name AvitoPay.apk (or similar) and downloads from websites with names like youla9d6h.tk, prodam8n9.tk, prodamfkz.ml, avitoe0ys.tk, etc. These website names are generated according to a clear algorithm: the first few letters are suggestive of popular classified ad services, followed by a random string of characters, followed by a two-letter top-level domain.

After infection, the Trojan displays a fake HTML update page (update.html) that blocks the device’s screen for a long period of time.
The Trojan displays the extortion page (extortionist.html) that blocks the device and demands a ransom for unblocking it. The sexually explicit images in this screenshot have been covered with a black box.
The Trojan displays a phishing page (bank.html) prompting the user to enter their bank card details. This page mimics a legitimate bank form and blocks the device screen until the user enters all the information. It even has its own virtual keyboard that supposedly protects the victim from keyloggers.

According to our data, 98% of all Rotexy attacks target users in Russia. Indeed, the Trojan explicitly targets Russian-speaking users. There have also been cases of users in Ukraine, Germany, Turkey and several other countries being affected.

To avoid such Trojans form landing on your mobile device:

A powerful, updated security solution is a must for all devices you use to shop online. Avoid buying anything online from websites that look potentially dangerous or resemble an incomplete version of a trusted brand’s website.
Don’t click on unknown links in email or social media messages, even from people you know, unless you were expecting the message.

Use Max Total Security for Android devices for total protection.

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