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I recently attended the awesome SANS DFIR, Mac and iOS Forensics and Incident Response course with Sarah Edwards. This has obviously given me lots of great inspiration on how to negotiate Mac analysis in general and to take a closer look at some of those system files that we covered in training.

I’ve spent a little bit of time digging through the log files on my MacBook (Mojave 10.14.2). I’m sure this isn’t new to most practised Unix beards but for those who aren’t aware, there’s a really great little log file called daily.out in /var/log. I had previously given little credence to this log but realised it can be used to determine a whole wealth of useful information. I also reviewed the weekly.out and monthly.out files but these were, in my case, far less granular.

At a high level daily.out contains information relating to disk usage and networking, this file is written at least daily and the configurations for all three of the periodic logs are stored in plist files in the following location:

/System/Library/LaunchDaemons/com.apple.periodic-*****.plist

Mac OS, operating system (OS) developed by the American computer company Apple Inc. The OS was introduced in 1984 to run the company’s Macintosh line of personal computers (PCs). The Macintosh heralded the era of graphical user interface (GUI) systems, and it inspired Microsoft Corporation to develop its own GUI, the Windows OS. Files for Mac can be run on all versions of OS X. You need to uncompress the 7z archive using the proper software (please use Keka to avoid problems). If the archive contains a DMG, double click it to mount the disk.

After reviewing the content of this file, it made me consider how this might assist in some of my casework?

Disk Usage

Firstly, I borrowed some grep skills from a very knowledgeable and tall colleague on my team to see if we could parse out just some specific information from the daily.out file. We extracted the lines only containing the dates, followed by the lines which related specifically to disk usage.

From this, we were able to find entries dating back as early as 3 months, and that the log contains:

• Dunce definition is - a slow-witted or stupid person.
• Aug 29, 2008 Apple suggests you try the Stationery feature in the OS X 10.5 version of Mail. 60-day extension using an iCard that featured a kitten wearing a dunce cap. Tired of my daily.

• Logical volumes mounted at the time entries are written

• Size of volumes

• Space used on volumes

As you can imagine, disk volume information will be highly valuable in showing drives or images which were attached when the log was written and especially if you know the volume name used by a device you’re looking to prove access to.

We can also ascertain some other information from this log which is quite valuable.

Bootcamp!

You may have an instance where a suspect, subject or general bad person is saying they have never used their Bootcamp install, however, you can see from the Bootcamp disk usage that the volume is being written to and from regularly. Perhaps a big chunk of data has been deleted before a date of interest?

Uptime

Another interesting piece from the daily.out file is that it will show uptime of the system when the log entries are written. This could help prove whether or not the system was switched on and in use over a specific period.

This may also show some interesting information about account usage on the computer. As Mac computers generally tend to be used by individuals, this means there’s usually only ever one account logged on at any time. If you have an experienced user who is elevating to root every day, then seeing multiple accounts logged on may not be uncommon. Although, if an inexperienced user who has no knowledge of the root account, is logged on many times when another account is logged on, it may be suspicious or warrant further analysis.

Again, we extracted the lines from the daily.out file we are interested in using a simple grep command:

As you can see we can pull some interesting information about computer and account usage:

• Shows uptime of the system at the point in which the daily.out entry is written

• Also shows the number of users logged on, remember this is usually going to be one

There are also some very useful network interface statistics listed in this file which are probably more relevant to IR investigations but we may look at these another time.

Reference:

Daily Dunce Mac Os Update

Daily Dunce Mac Os Download

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File: duneit_amiga_mac.7z

Click the button below to generate the download link

How to install and play the game

Files for Mac can be run on all versions of OS X.You need to uncompress the 7z archive using the proper software (please use Keka to avoid problems). If the archive contains a DMG, double click it to mount the disk.After that, drag & drop the game icon into Applications (or another folder, Desktop will be fine too).New versions of MacOS block applications from identified developers. If you have this problem, just press Ctrl while clicking the game icon, and select Open.Alternatively you can use the “Open Anyway” button in the General pane of Security & Privacy preferences. See the Help page for more info.

Need more info about this game? Would you like to download the other files? Go back to the Game Review page

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