Mal/Generic-S detection during Windows update (dnsapi.dll) – Resolved

Sophos is currently investigating detections of Mal/Generic-S reported by a small number of customers during a Windows update. Customers may see the following alert:

File “C:WindowswinsxsTempPendingRenames3975a596a21dd4018d1900007047c43d.wow64_microsoft-windows-dns-client_31bf3856ad364e35_6.1.7601.24168_none_4ab46d1fe69c9ba2_dnsapi.dll_c81f5791” belongs to virus/spyware ‘Mal/Generic-S’.

This has been determined to be a temporary file which is created during the update and not the final dnsapi.dll file.

File hash SHA1: 1024959e01ae4365eea1adb74dc9a58be228ca2e

SHA256: 4672c44629f38eabbf3b797866ab9f65bf0a99af49c204bc5c7ee75def3418b1

The Windows update involved was: KB4338818. There is no known impact caused by this issue and Windows Update reports the computer is up to date afterwards.

This issue is known to affect Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1 only.

The issue was resolved earlier today (11:15 UTC). Any new detections will be the result of cached data and can be ignored.

If you are still experiencing detections for this issue and are concerned please contact Sophos Support.

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