Published Sep 09, 2014 | Updated Sep 24, 2018

TrojanDownloader:O97M/Donoff

Severe |Detected with Windows Defender Antivirus

Aliases: No associated aliases

Summary

Windows Defender Antivirus detects and removes this threat.

This threat uses an infected Microsoft Office file to download ransomware and other malware onto your PC.

It can arrive on your PC as spam email attachment, usually as a Word file (.doc).

As part of our continued efforts to tackle entire classes of threats, Office 365 client applications now integrate with Antimalware Scan Interface (AMSI), enabling Windows Defender ATP and other security solutions to scan macros and other scripts at runtime to check for malicious behavior. Learn how this integration exposes malicious intent even with heavy obfuscation: Office VBA + AMSI: Parting the veil on malicious macros .

 

 

Use the following free Microsoft software to detect and remove this threat:

You should also run a full scan. A full scan might find other hidden malware.

Prevent malware infections from spam emails
Get more help

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

If you’re using Windows XP, see our Windows XP end of support page.

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