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How to protect your Internet-of-Things devices

The IoT can be an attractive target for criminals. Up to a million devices were hijacked to create the Mirai botnet which was used to extort ransom from companies, bring a university computer system to its knees, and, on Oct. 21, 2016, crash a large part of the internet.

Smart home devices like the Ring Doorbell connect to the internet and could be used as part of a bot attack. But there are steps to secure your devices.
Smart home devices like the Ring Doorbell connect to the internet and could be used as part of a bot attack. But there are steps to secure your devices.Read moreRing

Internet-connected devices are nearly ubiquitous, with computer circuitry now found in a variety of common appliances. They can include security cameras, DVRs, printers, cars, baby monitors, and refrigerators — even "smart" lightbulbs and clothing. Collectively those devices are called the internet of things (IoT).

The internet of things is a big, juicy target for criminals. Up to a million devices were hijacked to create the Mirai botnet, which was used to extort companies and bring a university computer system in New Jersey to its knees. The botnet was later exploited to bring down vast swaths of the internet in a sustained attack on Oct. 21, 2016.

Paras Jha, a former Rutgers University student, pleaded guilty Dec. 8 with two other men who admitted they wrote the Mirai code. Named after an obscure anime film character, Mirai scoured the internet for unsecured devices and easily found them.

Once discovered, the IoT devices were hijacked by the Mirai malware and became part of a botnet that launched assaults on internet service providers and scores of websites. Jha, 21, allegedly monetized the botnet by demanding ransom to call off the attacks, using it to inflate the number of advertising clicks on websites, and renting it out to other hackers for their own nefarious ends.

The attacks on Rutgers' computer system may have cost the school $9 million, prosecutors said. Rutgers officials told the cost of enhancing security was one of the reasons the school hiked tuition in 2016.

When Jha discovered federal investigators were closing in, he released the Mirai source code to the world to cover his tracks. The code is still circulating online and causing damage, according to Brian Krebs of

Krebs advises taking these precautions to keep your IoT devices protected:

  1. Avoid connecting your devices directly to the internet.

  2. Change the default credentials to a complex password that only you will know and can remember.

  3. Check the defaults, and make sure things like UPnP (Universal Plug and Play — which can easily poke holes in your firewall without your knowing it) are disabled.

  4. Avoid IoT devices that advertise built-in Peer-to-Peer (P2P) capabilities. P2P IoT devices are notoriously difficult to secure, and research repeatedly has shown that they can be reachable even through a firewall remotely over the internet. That's because they're configured to continuously find ways to connect to a global, shared network so that people can access them remotely.

  5. When it comes to IoT devices, cheaper is definitely not better. There is no direct correlation between price and security, but history has shown that less expensive devices tend to have the most vulnerabilities.

The Department of Justice also offers these tips to protect internet-connected devices.

  1. Do your research. Consider the security features of your IoT devices before buying. If the device uses a password, make sure it allows you to change it.

  2. Update firmware when available. IoT devices can be susceptible if not regularly patched. Only install updates from known and reputable sites.

  3. Disconnect your insecure IoT devices. Outdated security? Can't update passwords? Then unplug it.

  4. Turn off IoT devices when not in use, or periodically if otherwise always on. Malware is stored in memory and can often be erased by turning the device off and back on.

  5. Protect routers and WiFi networks. Use your router's built-in firewall, confirm it's enabled.

  6. Avoid using public WiFi to check IoT devices from a smartphone.

  7. Use antivirus and intrusion-detection products.

  8. Ask for help, or hire help, if you can't figure out firewalls or how to "segment" your network of IoT devices.

  9. Some free online resources can help determine whether your devices are susceptible to being accessed by Mirai or other malware. Be cautious and use only well-known sources.

  10. If you suspect your IoT device is infected, turn it off and on again to purge the device's memory. Change the password. File a report with the internet Crime Complaint Center.