Herodotus: The Android Malware That Types Like a Human to Steal Your Data
The world of cybersecurity is a constant battleground, with threat actors continuously developing new ways to outsmart security measures. A new and particularly deceptive Android malware, dubbed “Herodotus,” has emerged, showcasing a sophisticated technique designed to bypass the very systems meant to protect your financial accounts.
This malware isn’t just another data-stealing trojan; its genius lies in its ability to mimic human behavior.
What Makes Herodotus So Dangerous?
Herodotus is a potent Remote Access Trojan (RAT) that gives attackers near-complete control over an infected Android device. Its primary goal is to compromise financial applications and steal sensitive credentials. However, its method for doing so is what sets it apart from more common forms of malware.
Instead of instantly pasting stolen login information into a banking app, which can be easily flagged as robotic behavior by security algorithms, Herodotus meticulously types out usernames and passwords character by character. It even introduces slight, randomized delays between keystrokes, creating a typing pattern that appears remarkably human.
This “human touch” is a calculated move designed to fool advanced fraud detection systems. Many banks and financial services use behavioral analysis to identify suspicious logins. A sudden, instantaneous paste of a complex password is a major red flag. By typing like a person, Herodotus bypasses these behavioral checks, allowing it to access accounts undetected.
How Does an Infection Occur?
Like many Android threats, Herodotus typically spreads through malicious applications distributed outside of the official Google Play Store. Attackers often lure victims into downloading these apps from third-party websites, forums, or through phishing links sent via text or email.
Once installed, the malware immediately seeks powerful permissions to operate. Its most critical target is gaining access to Android’s Accessibility Services. These services are designed to assist users with disabilities but can be abused by malware to:
- Read the content on your screen, including usernames, passwords, and account balances.
- Intercept SMS messages, allowing it to capture two-factor authentication (2FA) codes.
- Perform actions on your behalf, such as tapping buttons and filling in text fields.
By securing these permissions, Herodotus can watch you log into your banking app, steal your credentials, and then log in as you later, all while mimicking your behavior to avoid suspicion.
How to Protect Yourself from Herodotus and Similar Threats
While the tactics used by Herodotus are sophisticated, you can significantly reduce your risk of infection by following fundamental security best practices.
- Stick to the Official Google Play Store: Avoid downloading and installing applications (sideloading) from unverified sources. The Play Store has security measures, like Google Play Protect, to vet apps before they reach your device.
- Scrutinize App Permissions: Be extremely cautious of any application that requests access to Accessibility Services, especially if it has no logical reason to do so (e.g., a simple game or utility app). Deny any suspicious permission requests.
- Keep Your Device Updated: Always install the latest Android security patches and system updates as soon as they are available. These updates often fix vulnerabilities that malware can exploit.
- Use a Reputable Mobile Security App: An antivirus or mobile security solution can provide an additional layer of defense by scanning for malicious apps and blocking known threats.
- Enable 2FA with an Authenticator App: While Herodotus can intercept SMS-based 2FA codes, it has a harder time defeating codes generated by an authenticator app (like Google Authenticator or Authy). This makes your accounts significantly more secure.
- Beware of Phishing: Never click on suspicious links in emails or text messages, especially those that urge you to download an app or update your account information immediately.
The emergence of Herodotus is a stark reminder that cybercriminals are always innovating. By staying informed and practicing diligent digital hygiene, you can protect your device and keep your sensitive financial information out of their hands.
Source: https://securityaffairs.com/183974/malware/herodotus-android-malware-mimics-human-typing-to-evade-detection.html
