Tech News: Microsoft Soundless Update Torpedoes Windows Defender – Threatpost


Tech News: Microsoft Soundless Update Torpedoes Windows Defender – Threatpost

Microsoft broke its built-in antivirus utility, thanks to a patch for a different issue. A broken Microsoft Windows Defender signature file that was c

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Tech News: Microsoft broke its built-in antivirus utility, resulting from a patch for a optimistic bid.
A broken Microsoft Windows Defender signature file that became as soon as causing machine file tests to fail got a patch this week – however the patch brought about an even bigger bid, making Defender particular person-led to antivirus scans fail altogether.
The problem became as soon as in situation for roughly a day earlier than Microsoft re-patched the built-in endpoint safety utility — however not earlier than a slew of press reports and particular person complaints shone a luminous gentle on the gaffe.
By near of background, the Machine File Checker (particularly, its administrative suggested “sfc/scannow”) had been out of commission since July. SFC is frail to search out corrupted files and repair them after installing updates. Since the July Patch Tuesday updates even supposing, it had been failing.
It turns out that SFC became as soon as flagging interior Windows PowerShell files within Defender (Microsoft’s ) as malformed.

The machine no doubt responded to this with a “does not compute” reaction, causing SFC to execute itself. In August, the computer big issued a perceive, explaining that “the Machine File Checker (SFC) machine flags files which would possibly neatly be located in the %windir%Machine32WindowsPowerShellv1.0ModulesDefender folder as corrupted or broken. When this bid occurs, you witness error entries that resemble the following: Hashes for file member attain not match.”
The repair for that computer virus became as soon as issued on Tuesday in a quiet substitute – however that substitute ended up causing handbook or scheduled Defender malware scans to fail if the “Quick” or “Elephantine” scan choices had been chosen – causing customers to seize to on-line boards to explain the computer virus. True-time scanning became as soon as silent enabled; and the “Custom” scan choice, the set customers can rob the folders they want to be checked, became as soon as also silent working, in step with reports.
The problem brought about some commentators to note that Microsoft is building a repute for breaking things when searching for to repair them:

Oh inquire of… #WindowsUpdate strikes all every other time. The CPU spikes, the battery drain factors, and another things from the the leisure month silent have not been cleaned up and now this… #Tackle10 stick a fork in it…
— Jason Falter ⚔️ (@JasonFalter) September 18, 2019

The problem has been resolved in the Security Intelligence Update for Windows Defender Antivirus – KB2267602 (Model 1.301.1684.0).
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