"Wanna" ransomware outbreak. Please see this Sophos article sophos.com/kb/126733 for advice on how to protect your organization. Immediate action recommended.
Issue Encrypted files cannot be deleted if the user who is logged on doesn´t have the required key in his keyring.
Cause The file filter driver prevents the deletion of files which cannot be accessed by the logged-on user.
Known to apply to the following Sophos product(s) and version(s) SafeGuard LAN Crypt Client for PCSafeGuard File Encryption
Depending on where the files are located, do one of the following:
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