Necro trojan is a malicious infection that targets Android devices. It’s a very serious infection that can avoid detection. Its primary goal appears to be to display hidden ads and interact with them, as well as download/execute arbitrary DEX files, install secretly downloaded apps, subscribe to paid services, and more.
Trojan infections targeting Android devices can be very tricky because they often go unnoticed by users. If users don’t notice them immediately, the trojan can freely perform their activities. The Necro trojan has several alarming features, including displaying and interacting with invisible ads, downloading and installing additional apps, and subscribing to paid services. It also collects certain information, including operating system version, RAM, and screen size. What’s worse, the trojan can be updated at any moment by the developers, which means they could add additional features.
Trojans on Android devices often go unnoticed by users because they generally do not show any obvious signs of being present. If users are more cautious, they may notice certain symptoms of an infection. That includes apps crashing without reason, the device running hot, the battery draining significantly faster than usual, Internet issues, etc.
Having an anti-virus app running on the device is a good idea because malware is difficult to notice without it.
How does Necro trojan enter users’ Android devices?
The Necro trojan appears to be primarily distributed via mods for popular applications like Spotify. Popular programs like Spotify often get unofficial mods that add features or make a program more convenient to use. These mods are made by users and promoted via unofficial sources, so users who download them are often taking a risk.
Necro trojan was specifically found in a Spotify mod called Spotify Premium MOD version 18.9.40.5. In addition to offering features, the mod also allows users to use Spotify Premium for free. These types of mods attract a lot of users who do not want to pay for services. However, with such mods, there’s always the risk that they could be concealing a malware infection, as is the case with this mod.
In addition to Spotify mods, it appears the Necro trojan has managed to get onto the Google Play Store as well. The Necro loader was found in several apps on the Google Play Store, with millions of downloads.
How to protect yourself from Android malware
With how widespread Android malware is becoming, it’s important that users be familiar with some of the ways they can protect themselves. Here are several ways users can protect their Android devices from malware.
- Research apps before downloading
No matter where you download your app from, whether it’s Google Play or any third-party app store, you should always carefully research programs before downloading them. You need to check the developer, read reviews, inspect permission requests, etc.
- Use legitimate stores/platforms to download apps
It is highly recommended to use official app stores like the Google Play Store to download apps. Third-party app stores are often poorly regulated, which makes it easier for malicious actors to upload harmful apps disguised as legitimate ones. The Google Play Store is the safest place to download apps because it has multiple security measures to prevent malware. However, as is the case with this Necro trojan, malicious apps can get past Google’s security. But it is very rare, and it’s still the safest platform to download apps from.
- Always carefully review requested permissions
It’s really important to carefully review permissions before granting them to an app in order to prevent malware from taking control of an Android device. When an app is installed, it asks for permissions, which depend on what the app’s feature is. However, it’s crucial to be very cautious when giving these permissions. For example, if you download a game and it asks for permission to read your messages or make calls, you should not give these permissions. Always question why an app would need the permissions it requests.
- Keep the device up-to-date
It’s important to install updates in a timely manner and keep all devices up to date. Updates patch known vulnerabilities, which, if unpatched, could be used by malicious actors so it is essential to install them.
- Do not click on unknown links or open unsolicited email attachments
It’s important that you are very cautious with all unsolicited SMS, emails, or messages that contain links or attachments, regardless of the type of device you’re using. Never click on unknown links and never open unsolicited email attachments without verifying whether they are safe first. You can verify them by scanning them with an anti-virus program or VirusTotal. Additionally, keep in mind that government agencies, banks, and other institutions typically do not send SMS messages or emails with links in them.
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