XCSS Ransomware

The XCSS Ransomware operates as typical ransomware - it aims to compromise the user's computer, initiate an encryption routine and lock the data stored there. The hackers will then extort their victims for money in exchange for the potential restoration of the encrypted files. When XCSS locks a file, it will change that file's original name significantly. The threat will append a unique string representing the specific ID assigned to the victim, followed by an email address and finally '.xcss' as a new file extension. After completing its encryption process, the XCSS Ransomware will drop its ransom note as text files named 'FILES ENCRYPTED.txt' and displayed inside a pop-up window. 

The note delivered inside the text files is extremely short and lacks any meaningful details. It just directs users to send a message to two email addresses - 'xcsset@criptext.com' and 'xcsset@aol.com.' The proper ransom note is the one displayed in the pop-up window. It clarifies that the ransom must be paid using the Bitcoin cryptocurrency and that the price will be determined based on the time it takes victims to establish contact. As a demonstration of their ability to restore the data, the hackers allow for a single file that is less than 1MB in size to be sent to them. Supposedly, they will decrypt it for free and then send it back to the users. 

The XCSS Ransomware is a new threat belonging to the Dharma Ransomware family.

The full set of instructions found inside the pop-up window is:

'All your files have been encrypted!

All your files have been encrypted due to a security problem with your PC. If you want to restore them, write us to the e-mail xcsset@criptext.com
Write this ID in the title of your message -
In case of no answer in 24 hours write us to theese e-mails:xcsset@aol.com
You have to pay for decryption in Bitcoins. The price depends on how fast you write to us. After payment we will send you the decryption tool that will decrypt all your files.

Free decryption as guarantee
Before paying you can send us up to 1 file for free decryption. The total size of files must be less than 1Mb (non archived), and files should not contain valuable information. (databases,backups, large excel sheets, etc.)

How to obtain Bitcoins
The easiest way to buy bitcoins is LocalBitcoins site. You have to register, click 'Buy bitcoins', and select the seller by payment method and price.
hxxps://localbitcoins.com/buy_bitcoins
Also you can find other places to buy Bitcoins and beginners guide here:
hxxp://www.coindesk.com/information/how-can-i-buy-bitcoins/

Attention!
Do not rename encrypted files.
Do not try to decrypt your data using third party software, it may cause permanent data loss.
Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.

The text files contain the following message:

All your data has been locked us
You want to return?
Write email xcsset@criptext.com or xcsset@aol.com.'