Could malware spread across our wireless network?

Hello, I need a bit of help. A scammer posing as a Norton employee got access to our MacBook Pro via LogMeIn Rescue for a few minutes before one of our family members forced shutdown. He had ample time to install a bouquet of malware, but Sophos isn't detecting any. Just to be safe, it seems like the best bet for this computer is to reinstall OSX after backing up any necessary files.
What I want to know is, could malware from this attack have spread across our wireless network to our other devices? Our laptops, desktops, phones, etc... On the targetted computer, System Preferences > Sharing shows only Printer Sharing enabled, not Web Sharing, Remote Login, Internet Sharing, or anything else. Is that a good sign? Or could an attacker have leapt from our wireless printer to another computer?
I am more than happy to provide you with any other details--just let me know. Thank you for your help.

Most of the anti-malware packages for the Mac do not detect anything.  All that would be needed is to add an account or launchd .plist to run some software that gives them future access.
You cannot trust that system any longer.
So yes save essential files, erase, and install from scratch, including all applications.  Only restore data files.
Unless that Mac had administrator access to the other Macs without needing to authenticate, it is unlikely they could have spread anything to other Apple devices in your home.  Which is one of the reasons anti-malware packages do not find a lot of malware on Macs.  They tend not to get any via the network.
Social Engineering, such as what happened to you, or getting someone to download and install something with an admin password, is the more common way bad stuff gets into a Mac.
So I would not worry about the other Macs in the house, but do a wipe of the attacked Mac.
Sorry for your loss.

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