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How to Find ‘Stalkerware’ on Your Devices

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Fighting stalkerware is tough. You may not suspect it’s there. Even if you did, it can be difficult to detect since antivirus software only recently began flagging these apps as malicious.

Here’s a guide to how stalkerware works, what to look out for and what to do about it.

Surveillance software has proliferated on computers for decades, but more recently spyware makers have shifted their focus to mobile devices. Because mobile devices have access to more intimate data, including photos, real-time location, phone conversations and messages, the apps became known as stalkerware.

Various stalkerware apps collect different types of information. Some record phone calls, some log keystrokes and others track location or upload a person’s photos to a remote server. But they all generally work the same way: An abusive lover with access to a victim’s device installs the app on the phone and hides the software by disguising it as an ordinary piece of software, like a calendar app.

From there, the app lurks in the background, and later, the abuser retrieves the data. Sometimes, the information gets sent to the abuser’s email address or it can be downloaded from a website. In other scenarios, abusers who know their romantic partner’s passcode can simply unlock the device to open the stalkerware and review the recorded data.

So what to do? The Coalition Against Stalkerware, which was founded by Ms. Galperin and other groups, and many security firms offered the following tips:

  • Look for unusual behavior on your device, like a rapidly draining battery. That could be a giveaway that a stalker app has been constantly running in the background.

  • Scan your device. Some apps like MalwareBytes, Certo, NortonLifeLock and Lookout, can detect stalkerware. But to be thorough, take a close look at your apps to see if there is anything unfamiliar or suspicious. If you find a piece of stalkerware, pause before you delete it: It may be useful evidence if you decide to report the abuse to law enforcement.

  • Seek help. In addition to reporting stalking behavior to law enforcement, you can seek advice from resources like the National Domestic Violence Hotline or the Safety Net Project hosted by the National Network to End Domestic Violence.

  • Audit your online accounts to see which apps and devices are hooked into them. On Twitter, for example, you can click on the “security and account access” button inside the settings menu to see which devices and apps have access to your account. Log out of anything that looks shady.

  • Change your passwords and passcode. It’s always safer to change passwords for important online accounts and avoid reusing passwords across sites. Try creating long, complex passwords for each account. Similarly, make sure your passcode is difficult for someone to guess.

  • Enable two-factor authentication. For any online account that offers it, use two-factor authentication, which basically requires two forms of verification of your identity before letting you log into an account. Say you enter your user name and password for your Facebook account. That’s Step 1. Facebook then asks you to punch in a temporary code generated by an authentication app. That’s Step 2. With this protection, even if an abuser figures out your password using a piece of stalkerware, he or she still can’t log in without that code.

  • On iPhones, check your settings. A new stalker app, called WebWatcher, uses a computer to wirelessly download a backup copy of a victim’s iPhone data, according to Certo, a mobile security firm. To defend yourself, open the Settings app and look at the General menu to see if “iTunes Wi-Fi Sync” is turned on. Disabling this will prevent WebWatcher from copying your data.

    Apple said this was not considered an iPhone vulnerability because it required an attacker to be on the same Wi-Fi network and have physical access to a victim’s unlocked iPhone.

  • Start fresh. Buying a new phone or erasing all the data from your phone to begin anew is the most effective way to rid a device of stalkerware.

  • Update your software. Apple and Google regularly issue software updates that include security fixes, which can remove stalkerware. Make sure you’re running the latest software.

In the end, there’s no true way to defeat stalkerware. Kevin Roundy, NortonLifeLock’s lead researcher, said he has reported more than 800 pieces of stalkerware inside the Android app store. Google removed the apps and updated its policy in October to forbid developers from offering stalkerware.

But more have emerged to take their place.

“There are definitely a lot of very dangerous, alarming possibilities,” Mr. Roundy said. “It’s going to continue to be a concern.”


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