Earlier this week we heard reports that windows pcs were exhibiting a black screen that prevented the user from accessing the Desktop. Security firm PrevX initially stated, much to Microsoft’s displeasure, that the error was caused by a Microsoft Security Update.
It seems that new information has determined that the error exists, and it is not caused by Microsoft’s Security updates but instead by various types of Malware.
PrevX had this to say on their blog:
“Having narrowed down a specific trigger for this condition we’ve done quite a bit of testing and re-testing on the recent Windows patches including KB976098 and KB915597 as referred to in our previous blog. Since more specifically narrowing down the cause we have been able to exonerate these patches from being a contributory factor.
We have not analyzed further whether a change occurred in the OS interpretation of this or other registry values. In any case, we believe there are significant benefits in the OS using the length of the value as recommended by the SysInternals article.
We have always strongly recommended keeping Windows and all other software up-to-date to reduce the window for exploitation by new threats. We’ll keep you updated with further progress if we find anything new.
We apologize to Microsoft for any inconvenience our blog may have caused. This has been a challenging issue to identify. Users who have the black screen issue referred to can still safely use our free fix tool to restore their desktop icons and task bar.”
Microsoft also responded to the incident:
“We’ve conducted a comprehensive review of the November Security Updates, the Windows Malicious Software Removal Tool, and the non-security updates we released through Windows Update in November. That investigation has shown that none of these updates make any changes to the permissions in the registry. Thus, we don’t believe the updates are related to the “black screen†behavior described in these reports.”
The problem seems to be caused by users who’s machines are infected with Malware such as Daonol
So it seems that a thorough cleaning of our systems is in order again. We recommend doing a pass with one of the top tier antivirus packages as well as Malware Bytes free scanner.
Let us know in the comments if you fell victim to this problem, and if so what you did to solve it.