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"Wanna" ransomware outbreak. Please see this Sophos article sophos.com/kb/126733 for advice on how to protect your organization. Immediate action recommended.
Certain backup and indexing software use the 'Change Journal' or 'Update Sequence Number (USN) change journal' to determine which files need to be backed up:
This can affect certain backup and indexing software that uses the USN change journal, as any file or files accessed by Sophos Anti-Virus can trigger a backup or re-index.
First seen in Sophos Anti-Virus for Windows 2000+
Sophos Anti-Virus, prior to version 10.3 resets the "last time/date modified" value on a file, which is recorded in the USN change journal as a reset.
To prevent the alteration of the 'last time/date modified' value a registry value can be applied:
The default value used by Sophos when this registry entry is not set is 1 - update last time stamp.
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