KSOD Black Screen of Death - Root Cause Explained

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Prevx's cybersecurity experts reveal how Windows product activation triggers the black screen of death (KSOD), clearing recent Microsoft updates as the cause.

In June, Betanews reported on the persistent problem known as the "black screen of death" (KSOD) affecting Windows Vista, prompting a reader to suggest that our focus on the issue might have been influenced by recent personal experiences. Interestingly, a similar perspective now emerges from British cybersecurity firm Prevx, which recently announced that it has cleared the latest Microsoft Patch Tuesday updates from suspicion as the cause of a surge in KSOD cases.

On Tuesday evening, Jacques Erasmus, Head of Malware Research at Prevx, shared insights via the company's blog regarding recent findings. His team has made notable progress in pinpointing specific triggers behind the black screen occurrences. They discovered that a side effect, initially identified over three years ago by Mark Russinovich of Sysinternals (now part of Microsoft), plays a key role. This issue involves Windows’ product activation inadvertently activating a pathway that can lead to KSOD.

The problem stems from registry entries that are meant to be terminated with a null character. When this termination is missing, the registry entry can effectively vanish from the registry editor, Regedit, or trigger the black screen problem. Although this particular cause has been known publicly for some time, Prevx's recent analysis emphasizes non-terminated registry entries as the primary culprit, rather than any recent modifications to access control lists (ACLs) that some previously suspected.

Microsoft appears to agree with this assessment. In a statement to Betanews, Christoper Budd, who oversees security response communications, clarified that their comprehensive investigation found no link between the recent updates and the KSOD incidents. Despite not being contacted initially by those reporting the issues, Microsoft proactively engaged with the affected users and shared these findings.

Given this clarification, one may wonder about Prevx's recent free tool designed to fix the problem. Erasmus explained that, at the very least, the tool does no harm. He reassured users that the utility, which was released yesterday, can be safely used to restore desktop icons and the taskbar for those experiencing KSOD, even if the root cause remains under investigation.

Prevx's earlier claims about widespread KSOD issues, initially reported by the BBC, appeared to be linked mainly to Windows 7. While the reports of a sudden spike in incidents seem to have subsided, it does not necessarily mean the problem has vanished altogether. Instead, it offers a chance to relax and reassess the situation, recognizing that the true cause may be different from initial assumptions.

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