Home Archives for 2019

2019 Unofficial Defcon DFIR CTF

Hello Reader,
It's that time again! First of all here is the important things you came here for:

1. Link to download this years images
https://www.dropbox.com/sh/4qfk1miauqbvqst/AAAVCI1G8Sc8xMoqK_TtmSbia?dl=0

2. Link to the CTF site:

https://defcon2019.ctfd.io/

This year Champlain College's Digital Forensic Association saved the

day by providing a CTF they hadn't released to the general public. Matt and I have been a little busy with the whole changing our lives into KPMG thing so without them there would be no CTF this year.

Prizes:
1st. DFIR Netwars Continuous from SANS (to last years winner I'm going to get yours resolved)
2nd. Magnet Forensics Prize Pack
3rd.Write Blocker and a copy of Eoghan Casey's Cybercrime book donated by BriMor Labs

The contest starts TODAY 8/9/2019 for those onsite at Defcon. You must be present to win.

The contest ends Sunday at 10am PST at which point we will notify winners.

Also Read: Daily Blog #664: Sunday Funday 4/5/20 - BAM Challenge by David Cowen

National CCDC 2019 Red Team Debrief - Hacking Exposed by David Cowen

Hello Reader,

Here are the slides for this years debrief.

https://drive.google.com/file/d/1szaXR64s3wlTKVgalkDqe9E17hM9h1Ew/view?usp=sharing

Hello Reader,
This weeks winner only recently discovered the blog and the contests therein. Why bring this up? It shows that you don't have to be around for years to have a chance at winning a Sunday Funday. In Michael's case he posted a comment with an answer and sent me an email, and when he is getting in reply today is a winning answer. Congratulations Michael Bryan!

Question:
For Dropbox Audit logs what all data can you determine about someone who was logged in?
What allows you to unique identify a file?
The Winning Answer:

Master Deputy Michael Bryan

Dropbox Audit Logs or Activity Logs are a feature of the Dropbox business accounts. The Advanced Team accounts include file level Audit logs as a part of the paid service. These logs are accessible from the Account Console which available the account administrator or administrators. The console provides very detailed information about team member’s usage of the account and nearly all facets of the members’ interactions are recorded and can be reviewed. The following items can be viewed in the Console of an advanced account regarding FILES:
Added a file
Added a file to their Dropbox
Added a file to their Dropbox (non-team member)
Added a folder
Allowed anyone to view links to files in a shared folder
Allowed file request emails for the team
Allowed non collaborators to view links to files in a shared folder
Allowed only team members to view links to files in a shared folder
Changed a file request
Closed a file request
Copied a file
Copied a file to their Dropbox
Copied a file to their Dropbox (non-team member)
Copied a folder
Created a link to a file using an app
Created a new file request
Deleted a file
Deleted a file comment
Deleted a folder
Disabled file requests
Downloaded a file (non-team member)
Downloaded files
Edited files
Enabled file request emails for everyone
Enabled file requests
Failed to delete some files remotely
File added to a showcase
File downloaded (non-team member) from a showcase
File downloaded (team member) from a showcase
File in showcase viewed by non-team member
File in showcase viewed by team member
File removed from a showcase
Liked a file comment
Made a file viewable only to members of the file
Made a file viewable only to team members with the link
Made a file viewable to anyone with the link
Moved a file
Moved a folder
Multiple files downloaded (non-team member) from a showcase
Multiple files downloaded (team member) from a showcase
Opened a file (non-team member)
Prevented non-team members from viewing links to files in a shared folder
Previewed files
Received files via file request
Received files via file request
Renamed a file
Renamed a folder
Requested access to a file (non-team member)
Resolved a file comment
Restored a file
Restored a folder
Restored a resolved file comment
Reverted files to a previous version
Rolled back file changes
Subscribed to file comment notifications
Successfully deleted some files remotely
Unliked a file comment
Unsubscribed from file comment notifications

Additionally, the audit logs maintain information about the users themselves. An administrator can see the following regarding member uses:
The date and time of the event
The member who initiated the event
The details of the event
The location in the form of an IP address of the team member
The logs detail who are the active team members of the last 28 days, the number of shared folders over the last 28 days, how much storage space is used, the number of links created, and a log of what devices are accessing the account over the previous 28 days. From the console you can also monitor password changes, sign ins, connected apps, changes in sharing, changes in groups, and changes in membership.

The files specific path and file name along with the connected user interactions would allow an administrator to identify a file in the log data.

The information for this initial and feeble attempt at an answer was gathered from poking around the internet and reading Dropbox.com helps files, Dropboxforum posts and two blogs written by “Kevin” on metadatum.wordpress.com (who actual cites the author of this challenge in his 2013 post about Dropbox forensics.)