Monday, 14 May 2018

The Magic Mirror Project



This story started one year ago, when I went to MakerFair in Rome, an event created bt Make magazine to celebrate arts, crafts, engineering, science projects and the Do-It-Yourself (DIY) mindset.

There, my eyes has been catched by the Magic Mirror, a mix between a mirror and a computer. I asked a lot of information regarding the object and I remember I thought: "I want to build one of this by myself"

During my way home was impossible for me to forgot that object. Arrived at home I switched on my computer and I started to googling how to build it. I was very busy at those time, so I read a lot and stored everything in my mind in order to use this information in the future.

At the end of the last year I went back to my open projects and I decided to complete it.

First of all I jot down in a paper every component i needed.

  • 1 Raspberry Pi 3
  • 1 Monitor HDMI, LCD or Led between 15 and 19 inc.
  • 1 Magic Mirror Software (to develop)
  • 1 Plexiglas tails
  • Mirror's film
  • ...and something useful to use like a minor

I made some research and at the end I decided to use Android as OS because I am very able to develop apps for this environment, so everything would have been faster.

So, I found a good custom Android ROM and I installed it in the Raspberry Pi 3.


I decided which features I'd like to have in my Magic Mirror and I started developing and Android's App for my Magic Mirror.




















I decided, as base, to have the time, date, icon weather and relative temperature degrees. Then I decided to add a services to have the daily news.

In the meantime looked for a HDMI monitor that could fit well with my goal.
I found and bougth it and when I finished Magic Mirror app has been the time to test it.





















The result looks like pretty good.
The next step was to dismantle the monitor's plastic cover in order to kepp only the panel.
I did it and then I measured its size in order to buy the plexiglass sheet.



I found a plexiglas sheet bigger than I need, so I have to cut the it.
But this task has not been the most difficult part...the hardest has been to apply the mirror's film in the best way as possible.

Of course, I have not been able to do the best job ever and as you can see there are some little bubbles.
The next step has been to fix the plexiglas with the monitor and this has been very easy thanks to the film cut longer than the need.

At the end this is the result! Me and my girlfriend mirrored into the Migic Mirro! :)




























The last step was to have a suitable and beautiful frame for the Magic...and voilà the frame!!
































There you can see the back of the Magic Mirror, with the monitor, its switch, the Raspberry and part of the cables.


























At the end, this is my Magic Mirror!





























Next steps? Integrate it with a microphone, a speaker and Google Assistant!


Friday, 12 January 2018

DDE Attack


In the recent weeks we are more and more often reading news that talks about attacks that exploit DDE technology, Botnets that exploit the DDE attack, Ransomware that are distributed via DDE attack and so on.
Well, this is the right time to clarify this technology and this new attack way.

Let's start from the basics, what is DDE?
DDE, which stands for Dynamic Data Exchange, it is an interprocess communication system (IPC) introduced for the first time in 1987 with Windows 2.0.
This technology and its functionality have been largely supplanted by OLE - Object Linking and Embedding. However, DDE is still used due to its simplicity.

Like macros, DDE is a legitimate feature of Microsoft Office and allows to share a set of data between applications. For example, you could create a Word document linked to an Excel document so that the data in the first one will be updated automatically whenever are you changing Excel spreadsheet data.

In which way this attack is bring out?
Performing a DDE attack is very simple. Just add the string {DDEAUTO} to call the DDE feature, , in the text of a Microsoft Word document, followed by the command you want to run, all within the braces.

Can it be used only in Office documents?
No, not only Microsoft Office documents.
This attack can also pull off via Outlook, by sending an email, an email or an appointment, known as "calendar" in company jargon.


Now we are going to create a formatted content using Microsoft Outlook's "Rich Text Format" (RTF) and insert the malicious code inside it and save it as email. Next step will be to attach this one to the email we'd like to send, write a a title and a text to attracting victim's attention and push it to open it.


What can you do with this attack?

In which DDE attack would be used:

  • to send a computer in Denial Of Service (DOS) by running countless instances of a specific software until the available resources are saturated;
  • running software or scripts that could give full control of the computer to the attacker;
  • download malware to use to exfiltrate data.


How to recognize fraudulent content?
When you are opening the file, a warning message is showed to you. It is warning yo that the file has an external contents and asks for confirmation to continue.


If your chiose has been "YES", a new message will be displayed asking if you want to run a specified application. The in example below the command / application quoted is "cmd.exe".


However, it should be noted that the information concerning the execution of the command can be hidden or omitted by editing the syntax of the malicious code.

How to defend yourself?
When the warning message realated external contents has popped out, clicking "No" block the attack attempted.


You can also defend yourself better by changind setting and display all messages in text format.
However, this workaround involves the deactivation of all formatting, colors and images from all incoming e-mails and consequently some contents could not be rendered.

Why this new attack?
Cyber criminals are starting to use DDE technology because it is different from macro and because they are always looking for new ways to mislead the victim.
For years we are witnessing attacks based on the macro but fortunately you can disable this technology and therefore prevent malicious content from being automatically performed when the file is opened.
This new way, though it has some limits dictated by the interaction with the user, could lead an untrained or careless person to think that it is an error that occurred due some file's errors.
In the last weeks this new attack way has grown exponentially thanks to the fact that you do not have to send attached to the email documents of Microsoft Office or PDF, but just attach another email or a "calendar".


Please note, this article was created in the end of October 2017, but only at this time I have been able to publish it.

Thursday, 22 June 2017

Coin Miner Attacks using Image File


I am here to tell about the "story of an image"...

Well, let's gooooooooo!!

Watching the picture below, what you can tel about it? Is it a simple image?


...and in the following picture?

YES!! They are the same picture, the first one is what you can see when you open it. The second one, is what you can see if you open it using for example a simple text editor.

Today I want to tell you about a malware that I discovered during my activity as researcher, malware hunter and malware Analyst.
It uses an image (JPG file) with embed a shellcode in order to infect the Linux System.



Shellcode Analysis:

Image reported above show part of image coded file and embedded shellcode in clear text.

Second line, command "crontab", is a time-based job scheduler in Unix-like computer operating systems.

"Crontab" option "-r" is present only in some Linux distro like Debian, Centos and Redhat. I can image that this malware is focused to Linux distro quoted above.


Third line of shellcode get seconds and transform them in days from 1970, then store them in a variable named"days". 
Sum the value 983 to "days" variable and assign this value to variable named"days2".
Then "days" variable will have the first 10 elements of MD5's digest of  "days2" .

Into shellcode's snippet reported below it is listing processes and concatenate other commands like xargs and awk.
The last one searches files that have text that match the pattern, when a line or text matches, awk performs a specific action on that line/text. In this case concatenating "print $2", it return the second item (proces' ID) and then kill it.

Using command "pkill -f", shellcode kills processes which matches the pattern for any part of the command line

This shellcode's snippet is used to kill any others miner that had infected the machine, in order to be the only one to use it.

"DoMiner" function using Curl command download into "tmp" folder a file image JPG named "car-498167.jpg" from website  "imagehousing[dot]com" and rename this image with "days" variable's value.

Then skips the first 2931 byte and save it again.
After this task file's permission is changed with execution privileges and in the end it use "nohup" command line-utility which allows to run command/process or shell script that can continue running in the background after you logout from a shell.
Sleep and then remove everyone file with name "days" and "daybefore".


NOTE: No part of source code file named "daybefore.jpg" has been created. Only a variable was created using this name.
Why put this shellcode line? Are there typographical error?

Carry on downloading image file "car-498167.jpg" using browser. It looks like the first one.

A quick analysis shows that it doesn't contains evil shellcode or evil artifacts, but I discovered a very interesting information.


As you can read, it is packed with UPX packer, version 3.91. 

I create a bash script in order execute it in debug mode, download image and skip 2931 byte as wrote into source code.

Below you can see my bash script and its result in terms of files.

Note: "12days" and "13days" are names that personally I decided to appoint to this images.

Above you can see both file, the first one (the image file) and the second one (executable file) that is the first one without 2931 bytes. Below you can take a look to the files size.

I used UPX packer to unpack ELF file. Below is reported a screenshot that contains details (format, compression ration, actual and future file size) about ELF executable file.

Now it's time to unpack ELF executable file

Below are reported details about ELF's file.




Shellcode In-depth Analysis:

Working on it and downloading "car-498167.jpg" image I noted that server returns a different image based on "User Agent".
The attacker can return the right file only if the system is x64 and is one of Linux distro reported above.
If it seems incredible take a look to the screenshot reported below. Request was made with Slackware distro.




Analyzing shellcode my attention was attract from string like the follow:
"4Ab9s1RRpueZN2XxTM3vDWEHcmsMoEMW3YYsbGUwQSrNDfgMKVV8GAofToNfyiBwocDYzwY5pjpsMB7MY8v4tkDU71oWpDC".

It is not a string base64 encrypted, what of it?

I retrieved a pastebin file where was present part of this shellcode, where I found the same strings.

As you can see, in this shellcode's snippet, if doesn't exist a file named "AnXqV" "Minerd CryptoCurrency" it is going to download and save into "tmp" folder with file named "AnXqV".
Then execution permission is assigned to this file.
At the end a command named "cryptonight" is running.

NOTE: CryptoNight is a proof-of-work algorithm. It is designed to miner bitcoin and to be suitable for ordinary PC CPUs.

According with handbooks every miner use a different command's format. In case reported above 
command "-a cryptonight -o stratum+tcp://URL:PORT -u WALLET_ADDRESS -p x" is used to run miner. So, string "4Ab9s1RRpueZN2XxTM3vDWEHcmsMoEMW3YYsbGUwQSrNDfgMKVV8GAofToNfyiBwocDYzwY5pjpsMB7MY8v4tkDU71oWpDC" is a Monero's wallet address.



ELF file In-depth Analysis:

Analyzing ELF file I was able to retrieve more information about malware's type, its author and the URLs reached out.

Who create this software have nickname "fireice-uk", below there is a screenshot of his github's account.


Also was possible to retrieve URL that are contacted by this miner


Checking domain owner, like in a fairy tail, website is liked to the Miner's developer (Fireice-UK)


Malware's developer embedded the miner developed by "fireice-uk". If the two person are different, why malware's developer have to use and include a miner developer my another person?

Below you can find evidence about matching between information extracted from ELF's file and source code created by "fireice-uk".

In my opinion who developed malware and miner could be the same person.

Friday, 10 March 2017

New Way to run VBScript Payload


Some day ago I received an email in an unmarked Gmail mail box. It was a clear Phishing email, but what catched my eyes has been a Password reported into the email's body and the attachment. It was a Microsoft Word file with ".docx" extension.

The first question that I asked to myself was: "Why this file wasn't dropped from Google security check?".

I decided to analyze the attachment and investigate about the sender.

First of all, I opened the attachment and putted into the password reported into the email's body. Opened, it had only three icons that looks like word's icons.



My first words were "What a fuck of Word file is this?!?!".
It doesn't makes sense! No text, no request to enable macro on startup.

The total words catch my eye. As you can see into the red circle, they were 369 words, but the document didn't had text, only 3 image's icons.

Double click on the image and I discovered the secret. The macro, VBScript, is embedded within it!

"What?! A macro into an image?!...You are a fucking genius!!" I Thought.

 But in which way is possible to embedded a VBScript into an image?!

The answer of my question was behind the right-click. Who created this document used Packager Shell Object to embed the VBScript content.

Taking a close look to Packager Shell Object properties was easy to understand that it was a VBScript file and where it was it was stored.

It was stored in "\Local\Temp" folder every time the Word file is executed. When the file is going to shut down it is going to be deleted from this folder.



The VBScript was obfuscated, but not in a hard way.

In the snippet code reported below, is reported two different files that are going to be created based on seconds:

  • the first one had extension ".viv"
  • the second one had extension ".qde"
Please note, seconds were used as file's name.



"JAy0D" function reads from file ".qde" and write into the file ".viv".

The snippet code reported below shows the resource that the dropper has to download, file with extension ".pkg".



Using whois protocol, I retrieved domain's information. Is useful to note that this domain is protect by privacy policy agreement.



File format ".pkg" is an installation file used by Apple in its Operating System.

Was impossible to download "tmp.pkg" file. The server gave error 404 Not Found.


Another resource that has to be downloaded is a file ."jpt".
JPT format file (JPEG-PNG-Type) takes advantage of the compression ratio from JPEG and PNG at the same time.
The main image is stored in JPEG while the alpha channel is stored in a PNG file as a gray scale.
While the PNG file can be 32 bit, 24 bit, 8 bit or even palette based, it is recommended to use
only 8 bit or palette based images in order to save space and actually take advantage of the JPT
format.
The next step was to analyze this file.


There I discovered the home page where this library come from.

It was hosted in a github page that it is not longer available.


From the page, I was able to recovery the developer's name "Jake J. Davis" and thanks to Google Cache, part of his GitHub account.

Jakey J. Davis closed a lot of his accounts in the last months, like github, libraries.io, etc.

Another analysis I did was the email's header. Here we can read sender's PC name connected to the server.




 Hey! Bruce, remember: "The first Internet's rule is: Stay Stealth"! 👀


CONCLUSION and HESITATIONs:

Something doesn't seems clear.
  1. File PKG is not reachable.
  2. JTP file doesn't seems to be JTP's format.
  3. This VBScript works only on Windows OS and it acts as a dropper to download other resources. It also use windows like commands ("cmd.exe") to perform some checks ("ping 8.8.8.8");
  4. If everything seems wrote for Windows OS, why it has to download file that works on Mac OS?







In conclusion: Given all these inconsistencies, many questions are still outstanding and this leave us two options, everything is part of a bigger project or the one who created these files is a newbie?


Thanks to my colleague for the support provided! ☺