Doctor Web: Mobile malware review for 2018

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December 28, 2018

In the past year, Android mobile device owners were again targeted by many malicious and unwanted programs, many of which were distributed via Google Play. At the same time, the tendency noted in 2017 to use various means for disguising and hiding Trojans to make them harder to detect has noticeably increased.

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One of the main threats to mobile device users over the past 12 months were Android bankers, attacking financial institution customers around the world. Malware that could download and run arbitrary code from the Internet posed a serious threat as well.

Virus writers were actively distributing Trojans to implement fraudulent schemes, as well as using other malicious apps to obtain illegal income. In addition, cybercriminals tried to launch mobile cryptocurrency mining and even used Trojan clippers to change the numbers of electronic wallets in the clipboard of Android devices.

The mobile firmware infection issue at the production stage remains relevant. In spring, Doctor Web virus analysts uncovered a Trojan embedded in the image of the Android operating system. More than 40 mobile device models were compromised.

Users were also threatened with malicious spyware throughout the year.

Principal trends of the year

New detections of malicious and unwanted programs on Google Play
Attempts of virus writers to hinder the detection of malware
Banking Trojans attacking customers of financial institutions worldwide
Trojans using Android Accessibility Service to automate malicious activities
Spread of Trojan clippers capable of changing e-wallet numbers in clipboard

Most remarkable events

At the beginning of the year, information security specialists detected the spread of the Android.CoinMine.15 Trojan miner infecting smart TVs, routers, streaming boxes, and other Android devices. It infected the equipment using the Android Device Bridge debugger. To do this, Android.CoinMine.15 generated random IP addresses and tried to connect to open port 5555. If the connection was successful, the Trojan installed its copy on the accessible device along with auxiliary files, including mining software for Monero (XMR).

In March, Doctor Web reported a new case of detecting the Android.Triada.231 Trojan in the firmware of more than 40 Android smartphone and tablet models. Unidentified attackers have embedded Android.Triada.231 in one of the system libraries at the source code level, while other representatives of the Android.Triada family are usually distributed as separate applications. The Trojan embeds itself in the Zygote system process that launches programs. As a result, Android.Triada.231 infects other processes and can covertly perform malicious actions. For example, it can download, install, and remove software against the user’s will. More details on this case, investigated by Doctor Web experts, are available in this article.

Attackers are increasingly using a variety of methods to prevent the detection of malicious and unwanted programs. In 2018, this trend continued. A popular way to reduce malware visibility is to use loaders. They can help keep Trojans and other dangerous software out of antivirus software’s reach for a longer time and cause less suspicion among potential victims. Using such loaders, cybercriminals can distribute various malware such as Trojan spyware.

In April, the Android.DownLoader.3557 Autocad 2017 torrent download. loader was found on Google Play. It downloaded onto devices and prompted users to install the malicious software Android.Spy.443.origin and Android.Spy.444.origin under the guise of important plugins. They tracked the location of an infected smartphone or tablet, received information about all available files, could send victim’s documents to attackers, send and intercept SMS messages, steal data from the contact list, record video, listen to the environment using the built-in microphone of the device, as well as intercept phone calls and perform other actions.

In August, we detected the Android.DownLoader.784.origin loader on Google Play. It downloaded Trojan spyware onto the device which was dubbed Android.Spy.409.origin. Virus writers distributed Android.DownLoader.784.origin under the guise of the Zee Player application, which allowed users to hide photos and videos stored in the memory of mobile devices. The program was fully operational, so the attackers’ victims had no reason to suspect anything bad.

However, Trojan downloaders are increasingly used to distribute Android bankers. In July, Android.DownLoader.753.origin was found on Google Play where it was disguised as financial applications. Some of them were actually functional to appear more trustworthy. Android.DownLoader.753.origin downloaded and tried to install various banking Trojans that stole confidential data.

Later, several similar malicious programs were detected on Google Play. One of them was given the name Android.DownLoader.768.origin. Cybercriminals distributed it under the guise of the official Shell software. Another addition to the Dr.Web virus database was Android.DownLoader.772.origin, which was disguised as a useful utility. Both Trojans were also used to download and install Android bankers.

Loaders are used to infect mobile devices with other malware. In October, virus analysts detected the Trojan Android.DownLoader.818.origin, distributed under the guise of a VPN client via Google Play. Later, Doctor Web experts uncovered several modifications hidden in fake games. They were named Android.DownLoader.819.origin and Android.DownLoader.828.origin. They were intended to install adware Trojans.

Multi-component malicious applications are becoming increasingly common. Each of the modules performs certain functions, which allows attackers, if necessary, to expand the Trojans’ capabilities. This operation principle helps hinder threat detection. Virus writers can quickly update these plugins and add new ones, leaving the Trojan body with a minimum set of functions and making it less noticeable.

Doctor Web experts discovered this combination in February and dubbed it Android.RemoteCode.127.origin. The Trojan, installed by over 4,500,00