Researchers at Zimperium’s zLabs have analyzed an Android Trojan that uses an automated, multi-stage infection process.

What’s new is that RatHat gives a live AI assistant the keys to the accessibility tree of the infected device and uses it to determine where to tap or scroll, rather than following a hardcoded script.

The variable attack path makes it harder for signature- and rule-based mobile security tools to detect this Trojan.

It also abuses Android Debug Bridge (ADB), a legitimate tool that lets a computer communicate with an Android device. By turning on Wireless Debugging, RatHat can escape the normal app sandbox.

The attack

The infection chain is unusually elaborate for a mobile threat, combining social engineering, accessibility abuse, and remote AI decision-making into a single pipeline.

• Victims are lured through smishing (SMS phishing) texts and malicious ads that lead to fake download pages, sometimes disguised as a popular streaming app or even a browser like Chrome. These pages trick people into sideloading a malicious APK (Android Package Kit).
• Once installed, the app pressures the user into enabling Android’s Accessibility Service, using a fake “network restriction” excuse or bogus financial incentive. Accessibility services run in the background and can inspect screen content and interact with apps on the user’s behalf.
• With accessibility access, the malware silently taps through Developer Options, turns on Wireless Debugging, and reads the six-digit pairing code straight off the screen. It then pairs with the infected device without a person or computer to complete the process. This is a known, legitimate Android feature (normally used by app developers to test on a phone over Wi-Fi) that RatHat repurposes for self-escalation.
• That self-pairing gives the malware a shell-level ADB session, which it uses to drop two disguised native binaries: A Go-based “agent” that runs system commands with elevated privileges, and a reverse-proxy client that opens a persistent tunnel back to the attacker’s server, bypassing firewalls and NAT (Network Address Translation).
• To steal login credentials, the Trojan creates overlays for targeted apps, most of which are financial. These overlays can also steal one-time passwords (OTPs) and multi-factor authentication (MFA) codes.
• Perhaps its most novel capability records raw touch coordinates (where the finger touches the screen) directly from the input driver. It then matches those coordinates against a database of known keypad and pattern-lock layouts to reconstruct PIN codes and unlock patterns, completely bypassing protections against screen-reading.

Other capabilities include intercepting SMS messages, a form of semi-autonomous device control provided by the AI service, and the ability to restore the malicious app after it has been uninstalled using a hidden background program.

How to stay safe

Most of RatHat’s tricks depend on convincing someone to sideload an app and grant it accessibility permissions, which means the usual mobile security advice remains the strongest defense.

• Only install apps from Google Play or another trusted official store. This does not guarantee safety, but it significantly reduces the risk.
• Be suspicious of any app that asks you to enable Accessibility Service for reasons unrelated to accessibility. Consider Android’s Advanced Protection Mode, which Google has started using to restrict which apps can request accessibility permissions in the first place.
• Never enable Developer Options or Wireless Debugging unless you understand why you need them. Legitimate apps have no reason to ask for them.
• Use an up-to-date, real-time anti-malware solution for your device. Malwarebytes for Android detects RatHat as Android/Trojan.Exploit.RatHat.

If your device is infected with RatHat, you will need to perform a factory reset because its persistence mechanism can survive normal app removal.

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Researchers have analyzed a new Android banking Trojan called Rokarolla. It can effectively take over a device, steal banking and crypto login details from more than 200 apps, and quietly monitor much of what you do on your phone.

On an infected device, Rokarolla steals banking and crypto login details. It also uses fake lock-screen overlays to capture your PIN, pattern, or password.

When you open one of the banking or crypto apps on Rokarolla’s target list, the malware downloads and displays a matching fake login page over the real app. Anything you type into the fake page, including usernames, passwords, and card numbers, is sent to the attackers.

Separately, Rokarolla abuses Android’s Accessibility features to monitor activity across the device. It can recognize WhatsApp screens by looking for familiar labels such as “Chats” and “Calls,” extract contact information, read SMS messages, and send new ones. These capabilities can help it intercept one-time passwords (OTPs) and two-factor authentication (2FA) codes.

Rokarolla can take control of text messages and phone calls, helping it block security alerts and hide signs of fraud.

It can also record everything you type and see on the screen. If you copy and paste a cryptocurrency wallet address, the malware can secretly replace it with one belonging to the attackers.

Other features help the malware stay hidden, including the ability to hide its icon, silence the device, turn off Google Play Protect, and prevent the screen from going to sleep.

How it spreads

Rokarolla is distributed through rogue websites, where it is offered as fake versions of popular apps like TikTok or Chrome.

Instead of sending you to the official Google Play Store, these malicious sites push you to download the app directly, a process known as sideloading. After you install it, the fake app poses as Google Play Protect and quietly downloads and installs the malware that carries out the attack.

To gain the access it needs, the fake app asks for powerful permissions, including Accessibility access, the permission to read SMS messages, and access to notifications. Because these requests can look legitimate, many users may approve them without realizing the risks.

How to stay safe

To avoid banking Trojans like Rokarolla, there are a few guidelines you should follow:

• Don’t trust apps that claim to be Google Play Protect or another system component. You should never need to install these manually.
• Use up-to-date, real-time anti-malware protection with web protection on your devices.
• Don’t sideload apps that are available on the Google Play Store. While malware can sometimes slip into official stores, the risk is much greater elsewhere.
• Deny powerful permissions to apps downloaded from links or websites, especially if they ask for Accessibility access, SMS permissions, or the ability to handle calls, even though that doesn’t match their stated purpose.
• In fact, any request for Accessibility access should be treated with caution. If an app that is not clearly an accessibility tool asks for it, deny the request and reconsider whether you trust the source.
• Scrutinize banking and crypto login screens. If something looks off, or you see multiple login prompts, close the app and relaunch it from its official icon.

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Scammers know more about you than you think. 

Malwarebytes Mobile Security protects you from phishing, scam texts, malicious sites, and more. With real-time AI-powered Scam Guard built right in. 

Download for iOS → Download for Android →