Dell SonicWall Threats Research team has received reports of a new
Ransomware Trojan, Jigsaw (named after the fictional character) which
encrypts the system files and also deletes them if the payment is not
made on time.
The Trojan poses as firefox with the following properties:
The Trojan adds the following files to the filesystem:
- %APPDATA%\Roaming\Frfx\firefox.exe (copy of original) [Detected as GAV: Jigsaw.A (Trojan)]
The Trojan creates the following key to the Windows registry to enable startup after reboot:
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run ""%APPDATA%\Roaming\Frfx\firefox.exe""
It displays the following iconic image and the message while encrypting the files:
The trojan finds the following files on the victim's machine and encrypts them:
It copies the filenames before encrypting at the following location:
It encrypts all the victims files listed above with .fun extension.
When trying to close the ransom window, it displays the following message:
It checks for the payment contacting the C&C server:
Dell SonicWALL Gateway AntiVirus provides protection against this threat via the following signature: