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Phishing Attack #2 – TIM – WIND phishing attack analysis

Phishing attacks are becoming more and more accurate and well-done thanks to the huge numbers of website that accept payments via CC (Credit Card). Telco operators are one of the favorites target of cybercriminal because of the amount of financial data required to activate a plan, top up your credit or buy a new phone online. Italian Telco operators TIM and WIND are not new of these attacks. Below a brief analysis of the clone-kit (ready to use kit uploaded by criminals to easily create a phishing website in a few seconds).

The email received by the target is showed below

Screen Shot 2016-05-14 at 7.53.56 PM

Clicking on the link the websites shows the form to fill to recharge your phone and have 50 euros for free.

Screen Shot 2016-05-14 at 7.54.06 PM

Going deeper, and analyzing the URL it’s possible to retrieve more informations and see that the server presents several holes to hack into it. Found! The clone-kit is still there.Let’s have a look on it.

 

Screen Shot 2016-05-14 at 8.02.37 PM

 

The kit is composed by many files,but the logic is inside the .php files:

  • best.php
  • secure.php
  • done.php

 

best.php is the first one who is responsible to generate the random URL viewed by the user.

Screen Shot 2016-05-14 at 8.06.28 PM

secure.php is responsible to save the collected informations like:

  • phone number
  • CC number
  • CCV
  • Expiration date

And to show the Verified by Visa PIN request to authorize the payments.
Screen Shot 2016-05-14 at 8.09.35 PM

The informations are still inside the page, ready to be sent to the last file “done.php”
Screen Shot 2016-05-14 at 8.12.15 PM

The code shows that the PIN is acquired and sent to the next page done.php, responsible to save/send the leaked data. As we can see from the code below the data are stored inside an HTML file on the hacked server and sent by email to the “phisher”.

 

Screen Shot 2016-05-14 at 8.13.32 PM

Reading the file on the web server is possible to retrieve all the victims’ CC data.

The first raw is an example triggered by the attacker to check if everything works fine.

Screen Shot 2016-05-14 at 8.15.08 PMScreen Shot 2016-05-14 at 8.15.08 PM

 

Be careful. Phishing is the most simple but the must effective attack.

 

 

 

 

 

 

 

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INSIDE CRYPTOLOCKER C&C SERVER

History

CryptoLocker was a ransomware trojan which targeted computers running Microsoft Windows and was first observed by Dell SecureWorks in September 2013. CryptoLocker propagated via infected email attachments, and via an existing botnet; when activated, the malware encrypts certain types of files stored on local and mounted network drives using RSA public-key cryptography, with the private key stored only on the malware’s control servers. The malware then displays a message, which offers to decrypt the data if a payment (through either Bitcoin or a pre-paid cash voucher) is made by a stated deadline, and threatened to delete the private key if the deadline passes. If the deadline is not met, the malware offered to decrypt data via an online service provided by the malware’s operators, for a significantly higher price in Bitcoin”(Wikipedia)

Infection Process

The CryptoLocker infection process start when the Microsoft Office Word is opened. Microsoft allow users to inject a macro scripting code inside documents, and give the possibility to execute it automatically when the document is opened.

“A macro is a series of commands and actions that help to automate some tasks – effectively a program but usually quite short and simple. However they are created, they need to be executed by some system which interprets the stored commands” (Wikipedia)

Analyzing the documents we received through a suspicious mail we extract the macro inside. The macro used by hackers to infect the machine is a Visual Basic module that is able to create new files inside the TEMP folder and download the real malware from a C&C server through an HTTP GET request. To avoid antivirus detection the malware is represented by a .PNG image containing a VB code inside.

Here is a sample took from the original macro that show how the malware can communicate with his C&C server and how the code is obfuscated.

CODE

Many characters are obfuscated (xx) on purpose. The macro we found inside is a VB macro with many functions to hook the malware and download the real .exe from another server.

After the dropper executes the malware the system is encrypting the personal files with public PGP key and storing the private key in the CC server with time bomb.

 

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