"Wanna" ransomware outbreak. Please see this Sophos article sophos.com/kb/126733 for advice on how to protect your organization. Immediate action recommended.
You need to access encrypted files on a Windows client that doesn´t have a SafeGuard Client with a file-encryption module installed.
First seen in Sophos Mobile Encryption for Android 2.2Sophos Mobile Encryption for iOS 2.2Sophos SafeGuard File Encryption for Mac
Operating systems Windows 7, Windows 8, 8.1
Files that have been encrypted using a so called "local key", a key which has a own passphrase, can be opened using the SGPortable.exe tool which is part of SafeGuard Data Exchange and Cloud Storage but can also be downloaded here.
Note: It is not possible to decrypt files which have been encrypted with a group or structure key.
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