Convert a list of hostnames to a list of IP addresses

I had a client with a huge list of hostnames that they needed to convert to IP addresses so they could scan them. That’s common. I used to have a Windows batch file to convert a list of hostnames to a list of IP addresses, so I dug it out of my archives. This uses ping but isn’t like a ping sweep; they knew the machine names but their tool needed IPs.

I used the file to resolve lists of machines so I could load them into a centralized logging or vulnerability management system. This client had the same need and nobody there had a similar tool. So I shared mine with them. And I present it here so I won’t lose it again, and if you need it, you can use it too.

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Garage sale tips and tricks for buyers

Garage sale tips and tricks for buyers

I am a garage sale pro. Over the course of a decade, I attended thousands of garage sales, saved thousands of dollars buying things for my own use, and made tens of thousands of dollars reselling my loot (yes, I had a business license and declared it on my taxes). Here are my favorite garage sale tips and tricks for buyers.

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Why MAC address filtering doesn’t help security

The other question that came out of my recommended DD-WRT settings was why not filter MAC addresses. I hate to be flip, but MAC address filtering doesn’t help, so why bother?

The reason is because your MAC addresses are broadcast as part of the network traffic, and it’s unencrypted. So your MAC addresses aren’t any secret at all. So it doesn’t do any good. One could argue it doesn’t do any harm. But it adds an extra step every time you put something on your wireless network. Why go to the inconvenience if you don’t gain anything from it?

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Identify bad guys through writing style

This month’s Social Engineer podcast discussed a tactic to identify bad guys through writing style, something the hosts expressed surprise was possible.

This won’t be news to anyone who minored in English or Communications or Journalism. A lot of factors go into style—where we grew up, where our parents are from, what we read growing up, our life experience, and it really is like a fingerprint. Fitzgerald’s Gatsby called everyone “Old Sport,” and we all have something like that, it’s just usually more subtle. I’ll say, “taste this,” when my wife or mother in law will say “taste of this.” That’s a regional thing. I pick up on that because I’m interested in language. A really good linguist can pick up on a lot more than that, and machine learning can potentially pick up on still more.

If you recall, it was the Unabomber’s long manifesto that brought down Ted Kaczynski.  Other forensics proved it, but the investigation began with his brother’s observation that the manifesto “sounded like Ted.”

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The publicity around security is a good thing

On one of the podcasts I listen to, two of the hosts questioned whether the publicity around recent security vulnerabilities are a good thing.

As a security professional who once studied journalism, I think it’s a very good thing, and it’s going to get better. I liken it to the rise of computer virus awareness. Read more

How to downgrade a Log Logic universal collector

If you’ve ever upgraded a LogLogic universal collector and had it fail to work, it’s very disconcerting to see the error message when you try to reinstall the previous version: Downgrades aren’t supported. But there is a solution if you need to downgrade a Log Logic universal collector. Read more

Things to do for your relatives’ computers this Christmas

I wish I’d posted this last week, since many of us see one set of relatives at Thanksgiving and a different set at Christmas (and perhaps New Year’s). Here are things you can do as preventative maintenance for relatives whose computers could use a little help. Read more

Hostsman makes it easy to block malware with a hosts file

I’ve written before about using the hosts file to block domains that are hosting malware. The idea is pretty simple. There’s a known list of domains that are either hosting or controlling malware, so by blocking your computer from accessing those domains, you make it much harder to get infected in the first place, and in the event that you do get infected, at least you block access to the command and control servers.

The problem is that Windows doesn’t make this easy. Well, I found an easy way: Hostsman. You can have it up and running in minutes.

Update: Don’t mess around with hosts files. It’s more efficient and more effective to change DNS servers instead.

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