Also known as: Simple Locker, Android.Slocker, Andr/Slocker-A, Jisut, Pigetrl
Category: Ransomware
Type: Mobile ransomware
Platform: Primarily Android
Variants: Over 400 variants have been detected since its first discovery.
Damage potential: Locks Android devices, encrypts files, demands a ransom, and leaks personal data.
Overview
SLocker (short for Simple Locker) is a type of ransomware that targets Android devices. It was first discovered back in 2015 and has since evolved, developing more than 400 different variants. Depending on the version, it can either lock your device's screen or encrypt your files, demanding ransom in exchange for access.
The early versions of SLocker were used to lock the device with a full-screen message that impersonated government agencies like the FBI. It would accuse the victim of illegal activity and ask to pay a fine. The newer versions are much more sophisticated. They encrypt files and demand ransom in cryptocurrency to unlock them.
Possible symptoms
The clearest sign that your device has been compromised by the SLocker ransomware is a persistent screen lock. This locked screen overrides system functionality, which makes it very hard for the user to regain control of the device. However, the following symptoms might also signal about the SLocker infection:
- Inaccessible files or changed file names
- Messages demanding ransom in cryptocurrency
- Sluggish device performance
- Unfamiliar apps on your device
- Warnings from law enforcement or government agencies
Sources of the infection
SLocker, like similar threats, typically infects devices through malicious attachments in phishing emails or social media messages. Unsuspecting users click on these attachments, unknowingly downloading the malware. In addition to emails and instant messages, users often download SLocker from unreliable sources like pirated websites. SLocker also hides in malicious ads or compromised apps. The worst part is you don't always need to download anything to infect your device — sometimes hackers exploit software vulnerabilities in outdated applications to infiltrate your system.
Protection
The more of these tips you incorporate into your cybersecurity routine, the safer your browsing experience will be:
- Only download apps from official sources. Use only the official stores, such as the Google Play Store, to download apps. For even more protection, disable app installations from unknown sources in your device settings to avoid accidentally downloading malicious software.
- Update your apps and operating system. Keep your operating system and apps up to date. Patching system vulnerabilities is crucial to protect your data from SLocker and similar malware.
- Use NordVPN's Threat Protection Pro™. This advanced feature blocks malicious sites and may help prevent drive-by downloads.
- Learn about phishing techniques. Educate yourself about the most common phishing techniques and safe browsing. Never click on links or attachments from unknown senders.
- Monitor network traffic for suspicious activity. Keep an eye on any unusual network traffic, such as connections to TOR (a network that hides your identity) or websites and servers you don't recognize, which could show communication with a ransomware command and control server used by cybercriminals.
Removal
If you suspect that your device has been infected with SLocker, isolate it from the internet as soon as possible to prevent the malware from spreading further. Then, reboot the device in safe mode. Next, run a thorough antivirus scan and remove any ransomware components. If you're familiar with ransomware indicators, inspect your system for files associated with SLocker and delete them.
If the SLocker persists, try restoring the system from a clean backup. If these steps fail, seek professional help. A cybersecurity specialist can help to restore your system with minimal downtime and data loss.
