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7zip.com Is Serving Malware

malwarebytes.com

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Re: 7zip.com Is Serving Malware

#72
post #37

Earlier quoted context omitted.

Do people even double check installers are digitally signed? There's so much open source stuff out there that is not digitally signed, most people might not even notice.

I use winget or homebrew, those tools do so for me and if something doesn't match they show an error.

Neither WinGet nor Homebrew packages/formulae provide authenticity checks. They have integrity checks for file transfer. That’s it. Where did the file come from when it was entered into the respective repository? No statement.

Whether Authenticode provides a sufficient authenticity check is yet another question, of course. Still, file integrity verification is just a side-effect.

Re: 7zip.com Is Serving Malware

#73
post #61
post #39

I've started using winget to install my apps for exactly this reason. I can't keep track of every url for every piece of software.

Is that safe? Microsoft's policy [1] seems to say that anyone can publish an update to a package as long as it passes "an automated process" which checks that it's "not known to be malicious". [1] https://learn.microsoft.com/en-us/windows/package-manager/pa...

It’s not. And it gets worse. A WinGet package can suddenly be introduced for software you have already installed and then the next "update all" will install whatever. Could be something completely different!

WinGet is not only unreliable, it is but one step removed from Remote Code Execution as a Service. Well, maybe one-and-a-half, if package repo maintainers were to pay attention, but that’s not realistic.

Re: 7zip.com Is Serving Malware

#74
post #50

[dead]

> Your machine runs a little slower, your bandwidth gets a little thinner, and someone halfway around the world is routing traffic through your home IP. I wish in 2026 the default on new computers (Windows + Mac) was not only "inbound firewall on by default" but also outbound and users having to manually select what is allowed. I know it is possible, it's just not the default and more of a "power user" thing at the m…

I do this outbound filtering but I don't use a computer running Windows or MacOS to do it

It doesn't make sense to expect the companies promoting Windows or MacOS to allow the user to potentially interfere with their "services" and surveillance business model

Windows and MacOS both "phone home" (unfiltered outgoing connections). If computer owners running these corporate OS were given an easy way to stop this, then it stands to reason that owners would stop the connections back to the mothership. That means loss of surveillance potential and lost revenue

As of 2006, still nothing stops anyone from setting the gateway of their computer running a corporate OS to point to a computer running a non-corporate OS that can do the outbound filtering

Re: 7zip.com Is Serving Malware

#75

Earlier quoted context omitted.

Whenever I see "modern Windows experience", it always turns to be worse than the original one.

I take your point, and usually you're right, but in this case "modern features" includes things like having an "extract" button show up when you right click an archive file in Explorer.

You can have that, and in an even better way: Simply disable the blight that is Windows 11 context menus and go back to real context menus.

I’m not even joking, they are basically superior in every way. They open faster, they have only one visual axis and they support all the shell extensions you remember. (Too many shell extensions could make them just as slow though.)

Re: 7zip.com Is Serving Malware

#76
post #50

[dead]

> residential proxy node and sells your IP address to third parties for fraud, scraping, and ad abuse.

I know the potential for bad actors here, but there is legitimate use of these services.

I used to work in the “brand protection” space. Our entire business model was SOC-aaS, scraping, verifying, and ending lookalike sites among other threats. If you’ve banked at Wells Fargo or had an iCloud account, our job was to try and make that a little bit safer.

Fact is the enemy gets a vote and quite many so-called threat actors are buying very capable kits that know what the fingerprint of a clean room virtual instance or VPN looks like.

Re: 7zip.com Is Serving Malware

#77
post #50

[dead]

> residential proxy node and sells your IP address to third parties for fraud, scraping, and ad abuse. I know the potential for bad actors here, but there is legitimate use of these services. I used to work in the “brand protection” space. Our entire business model was SOC-aaS, scraping, verifying, and ending lookalike sites among other threats. If you’ve banked at Wells Fargo or had an iCloud account, our job was to…

Maybe this is too obvious to say but it doesn't matter what they're selling the access for, it's the unwanted installation of the proxy that's malware. If you're buying access from a service that gets its residential network access that way you're contributing to the problem.

Re: 7zip.com Is Serving Malware

#79
post #50

[dead]

> It's a fundamentally different threat model and most endpoint protection isn't looking for it because the behavioral signatures look like normal network activity. Is it even possible for a prosumer home router like OPNsense or OpenWRT to detect this?

For the router itself? No. For the 'prosumer' admin? Sure.

How many prosumers or otherwise network admins filter outbound traffic though? And of the select few that do—how many are actually 'inspecting' say, outbound TCP/443 (e.g., monitoring traffic volume, looking up destination addresses, and/or inspecting SNIs) for example?

Re: 7zip.com Is Serving Malware

#80
post #10

Does the 7-Zip author still refuse to digitally sign or even provide hashes of the official downloads? It's an extremely weird flex, he thinks it's a frivolous waste of time or something.

He's always been an odd one, for a long time he refused to enable even basic hardening features like ASLR and DEP because they made the executables slightly larger. He eventually relented on some of those, but last I heard the more advanced mitigations like HE-ASLR, CFG and GS were still disabled.

Even more, there are regularly security vulnerabilities patched in releases that don't get CVEs and don't get any mention in patch notes, there are no incremental commits between releases, just giant code dumps. There's no changelog linked on the 7-zip.org website. There's no auto-update or update check mechanism, which is problematic for a project with regular CVEs whose primary purpose is handling untrusted inputs.

7-zip is not a serious project and its use should be strongly discourged.

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