They’re sent over the air with each packet going to and from the device, as the MAC address is used to ensure each packet gets to the right device. But MAC addresses can be easily spoofed in many operating systems, so any device could pretend to have one of those allowed, unique MAC addresses. MAC Address Filtering Provides No Security Your router probably allows you to configure a list of allowed MAC addresses in its web interface, allowing you to choose which devices can connect to your network. With MAC address filtering a router will first compare a device’s MAC address against an approved list of MAC addresses and only allow a device onto the Wi-Fi network if its MAC address has been specifically approved. Normally, a router allows any device to connect - as long as it knows the appropriate passphrase. Additionally, the CCleaner attack also cast a wide net in looking for a smaller population of specific targets.RELATED: Don't Have a False Sense of Security: 5 Insecure Ways to Secure Your Wi-FiĮach device you own comes with a unique media access control address (MAC address) that identifies it on a network. They also look for other consistent tells the group uses in its code across different campaigns, though Kaspersky doesn’t reveal details of these indicators. But Kaspersky researchers see similarities in the way the Asus backdoor, the CCleaner backdoor, and other instances of ShadowPad were conceptually designed. Raiu adds the group that may be behind all of these attacks, known as Barium, rewrites tools for every large attack so scanners can’t detect them by looking for its old code signatures. Kaspersky’s Raiu says that the firm suspects the Asus incident is connected to a series of mostly thwarted 2017 ShadowPad attacks as well as the successful use of ShadowPad in the CCleaner compromise. Tainted updates in otherwise legitimate software platforms have already wreaked havoc in big incidents like the May 2017 NotPetya outbreak and the June 2017 CCleaner compromise.
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