How To Crack Dmg Password Mac Rating: 3,1/5 2429 reviews

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  1. Even if you aren't a sinister evildoer, there could be times when you need to get into a computer without the password. It's quite easy to do on a Mac, and learning how to do it can help.
  2. As we go through the entries, the specs for the new password protected DMG disk image are following: Save As sets the file name of the image file, e.g. My private data.dmg. Where sets the location of the image file. Volume name sets the name of the volume as it would appear in Finder later; Volume size sets the estimated size of the DMG file.

Mac OSX Password Cracking

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TL;DR: There are several ways to enumerate information from a Mac shell and to collect encrypted credentials for OSX password cracking.

Problem and Rationale

During a recent assessment the client had close to 10,000 Mac OSX systems throughout their global presence. All of these Macs were authenticating to Active Directory and allowed all logged in users local admin rights; via a misconfigured sudoers rule. Since this blog is lacking any real reference material specifically for OSX, I figured I would detail the information gathering and attacks I preformed during the assessment.

Attacks and Methodology

The default base install of Apple OSX will allow the primary user configured on that workstation to sudo to root. When Active Directory backed authentication is used, newly logged in users can inherit the primary user role if system defaults are not changed. This would effectively make all domain users local admins on all of the affected Macs. This is good news since root level permission is required to pull local password hashes.

If the OSX systems do not use AD authentication don’t fret. By default the SSH server is enabled and it does not have any lock outs on failed login attempts. If all else fails, physical attacks still work very well against OSX. Just walk up to one and hold Command+S during boot to log into a single user root terminal. If the system isn’t using full disk encryption you can simply copy files over to a USB flash drive. Crysis 2 working serial key.

Once you have a terminal on a Mac, it’s good to check user and group memberships. Again, if the user is a part of the admin group they can sudo by default; and if they are part of the wheel group they are effectively root.The following is a list of useful commands to use when in a terminal:

Note: The commands above all have a target of ‘.’ or ‘localhost’. If the system is connected to Active Directory it can be queried in a similar manner.To list all Domain Admins use the following command:

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If the user doesn’t have sudo or root privileges, you can try to elevate to root privileges with one of several local privilege escalation vulnerabilities. Some recent noteworthy options include CVE-2015-5889, CVE-2015-1130, or just use some of the Yosemite environment variables like the following:

If the device is up to date on its patches about all one can do is some file pillaging. The two things I would note are Apple scripts (.scpt) and property list (.plist) files are very popular in OSX. Both file types are stored to disk as binary files. As such they need to be converted back to ASCII, to be human readable.
To view the contents of an Apple script file use a command like:

To convert a .plist file from binary to its native XML use a command like:

Note: plutil will convert files in place, so take care to make copies of files you’re working with.Alternatively the plist files can be exfiltrated to Kali and converted to XML using the libplist-utils library. The conversion command might look something like this:

If root level access is acquired, we can go straight after the local user’s plist files. Each user’s plist file contains their individual settings and their encrypted credentials. The directory that contains all local users’ plist files is /private/var/db/dslocal/nodes/Default/users/.
If another user is currently logged into the system, the user’s keychain can be dumped by root. This will provide clear text access to all saved credentials, iCloud keys, the file vault encryption key, and the user’s clear text password. To dump the users keychain use a security command like:

WARNING: In newer versions of OSX this will generate a dialog box on the user’s screen. This will obviously alert the user and only produce usable output if the user accepts.

OSX Password Cracking

There are several ways to gain access to the encrypted shadow data, which is needed to conduct OSX password cracking. Two of them have already been mentioned above. If you have root access preform a dscl . -read /Users/<user> or if you grab the users plist file from /private/var/db/dslocal/nodes/Default/users/ and covert it to XML, there will be a XML element called ShadowHashData. The ShadowHashData is a base64 encoded blob containing a plist file with the base64 encoded entropy, salt, and iterations within it.

Note: Before the base64 can be cleanly decoded in each of these steps, the XML elements, spaces, and line breaks will need to be removed manually.
The first step is to extract the plist file form the shadow hash data and convert it back to XML. This can be done with the following commands:

Next cleanup and convert the base64 encoded entropy to hex format. This can be done with the following commands:

Third cleanup and convert the base64 encoded salt to hex format. This can be completed with the following set of commands:

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Next we can put all the hex value strings together into the following hashcat format (7100).

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Lastly put that baby in hashcat as OSX v10.8/v10.9 and watch it burn.

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As Always:

How To Open Dmg Files Windows 10

A dmg file is a compressed file structure, capable of containing folders, files, etc. Dmg files can be used for a variety of purposes, from encrypting a home directory (ie – FileVault) to encrypting a file structure manually. A dmg file can be encrypted fairly simply. From Disk Utility, create a dmg file by clicking on the File menu and selecting New and then Blank Disk Image. This will bring up a screen where you can provide a name for your home folder and a size, then select either AES 128 or AES 256, which is a bit slower.Go ahead and click on Create and then at the resultant password screen go ahead and provide a password to be used. And let’s just go ahead and uncheck the option to create an entry in Keychain for the password.If you would rather do so from the command line I covered how to do so in a previous post.Now let’s download Spartan, a tool built by Ryan Kubasiak. Now download a dictionary file. I just used one of these (and for expedience sake I paired down the contents to only have about 100 possible passwords, one of which was mine). Now go ahead and open Spartan, clicking on Go! at the splash screen.At the Choose a File screen, browse to and then select your password file, clicking Choose once you have done so. At the next Choose a File screen browse to and then select your dmg file which you would like to crack the password for. The password file will then be read into RAM and the password cracking will commence.According to the length of your password this could take a long, long time, but when it’s done you will have your password, assuming it was in the dictionary of passwords you used. Dictionary files can be downloaded from a variety of sources, some collections taking up gigabytes upon gigabytes of space and covering every possible keyboard combination. Therefore, the longer the password that you use and the more complex the password is, the longer it will take to break the encryption.“So, would your holiness care to change her password?” – The Plague