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Avoid using this phrase in your text file; Microsoft Defender could consider it a threat

It flagged the text file as Trojan:Win32/Casdet!rfn

2 min. read

Published onJune 24, 2024

published onJune 24, 2024

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Microsoft Windows Defender has improved greatly since the inception of Windows 10 and is considered a reliable security tool for the average user.

However, a bug spotted byyappy, an X user, indicates that Microsoft Windows Defender can act faster than necessary in an attempt to secure your computer.

Here is what the post by Yappy says:

my gf just found out that a text file solely containing the string “This content is no longer available.” trips up windows defender lol

In this image he shared, we can see the phrase This content is no longer available in a Notepad. When this file is saved as a text file on the computer, Microsoft Defender flags it as a Trojan:Win32/Casdet!rfn and removes it without warning, irrespective of the file name. The act is claimed to protect your device from potential severe threats.

Upon further research and investigation, Yappy and other Xers found that the SHA-256 collision caused this false positive. This could be because serious threats usually have this headlining text string and, therefore, were detected as threats by the Defender detection engine.

This is not the first time Microsoft Defender has missed a step; there have beeninstances in the past. Overall, Microsoft Windows Defender is a decent antivirus tool. Also, this bug is not serious, and if you add another text, even a punctuation or extra space, it will no longer be detected as a threat.

In other news, you can check out thethreat explorer’s latest feature, which allows it to become a hub for direct cyber protection actions.

We hope Microsoft acknowledges this bug and fixes it soon. Have you tried creating a file with the same phrase? If so, share your experience with our readers in the comments section below.

More about the topics:Microsoft Windows Defender

Srishti Sisodia

Windows Software Expert

Srishti Sisodia is an electronics engineer and writer with a passion for technology. She has extensive experience exploring the latest technological advancements and sharing her insights through informative blogs.

Her diverse interests bring a unique perspective to her work, and she approaches everything with commitment, enthusiasm, and a willingness to learn. That’s why she’s part of Windows Report’s Reviewers team, always willing to share the real-life experience with any software or hardware product. She’s also specialized in Azure, cloud computing, and AI.

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Srishti Sisodia

Windows Software Expert

She is an electronics engineer and writer with a passion for technology. Srishti is specialized in Azure, cloud computing, and AI.

With KB5043178 to Release Preview Channel, Microsoft advises Windows 11 users to plug in when the battery is low#

Copilot in Outlook will generate personalized themes for you to customize the app#

Microsoft will raise the price of its 365 Suite to include AI capabilities#

Death Stranding Director’s Cut is now Xbox X|S at a huge discount#

Outlook will let users create custom account icons so they can tell their accounts apart easier#

Avoid using this phrase in your text file; Microsoft Defender could consider it a threat#