Questions tagged [7zip]

7-Zip is an open source file compression and archiving application. Use this tag for questions regarding this application.

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7z “Copy 7zAES” algo brute force with 32 char password for when original file is available (QNAP QLocker ransomware) [duplicate]

As some in here might know, there is/was a ransomware attack going on worldwide that used 7z to encrypt all files <20MB for a ton of users world wide. Each user has a unique 32 char password (Upper ...
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1answer
48 views

Is checking zip content on another PC enough to prevent data leak?

Let's say I have two kind of files on my Windows desktop - first are files that can be published and shared with other people, second kind is confidential and should remain private. To share files I ...
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1answer
137 views

Can I consider files compressed with password safe at all?

A follow up to my 7,5 years old question. Back 10-15 years ago, when I wanted to send an executable file over Gmail from my PC, all I had to do was to change file's extension to some meaningless one ...
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4answers
2k views

Are files encrypted with 7ZIP vulnerable to password crackers?

A client says they can't accept password-protected PDFs to put in their payroll system, so I have to send them without security. I don't want to send unsecured PDFs via e-mail because e-mail is ...
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3answers
133 views

Does compression level influence security of encryted 7z files?

I want to archive some GB of sensitive data. It is to be stored on an external drive that also includes non sensitive data so i don't want to encrypt the whole drive. For that purpose i want to use ...
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0answers
663 views

Recovered a 7z password with hashcat, but it's not the right one

I am trying to recover a 7z file, but have forgotten the password. It's completely AES-256 encrypted (i.e. not even the filenames are available). Steps: Generated hash file with 7z2hashcat.pl Ran a ...
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0answers
2k views

Decrypting a password-protected 7z file with Delta filter fails

I have made a 7z archive using Delta filter containing a wav file and I have protected it with a password. I am running a terminal in Kali Linux. My problem is that I cannot get the password cracked ...
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0answers
641 views

Getting an error when running John The Ripper on 7zip file

I've never really worked with this tool, John Jumbo 1.9. I'm just curious since people say 7zip is a secure way of encrypting files, so I wanted to try it myself. Anyways, I encrypted a file with 7z, ...
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1answer
121 views

JohnTheRipper Advanced Mask

I have problem to construct advanced mask to crack hash of 7zip file. The password have 16 chars where are all lower, upper, decimal and !@#$%-_=+: Main information is that any char can't duplicate ...
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2answers
725 views

Can a PowerShell script inside a Zip file execute automatically upon unzipping?

I have a zip file that has a Powershell script inside that I want to look at. Is it possible that the Powershell script could execute automatically just by unzipping the file? This is not something I ...
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0answers
190 views

How to make 7-zip files more secure? [duplicate]

I came across these articles which imply (to me) that 7-Zip's AES implementation is not good: https://twitter.com/3lbios/status/1087848040583626753 https://threadreaderapp.com/thread/...
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1answer
792 views

Executing vs Extracting PE32/PE32+ executable

If you have a malicious upon execution ("running" it / double clicking on it) .exe , would extracting its contents with something like 7-Zip utility mitigate its effects? Or can it still do harm?
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1answer
3k views

Encryption Using 7z or Zip File

I'm wondering which encrypted 7-Zip file format has better encryption: 7z with 256 AES or zip file with 256 AES? Assume that a strong password is used, then which encrypted 7zip file format has ...
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2answers
3k views

What is the impact of the reported weak IV in 7 Zip?

It has been reported that 7 Zip generates IVs in a weak manner. What is the actual impact of this? I'm asking about historical Zip files that I've sent. I've no plans to use 7 Zip going forward until ...