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Microsoft Security Intelligence
Published Feb 11, 2016 | Updated Sep 15, 2017


Detected by Microsoft Defender Antivirus

Aliases: No associated aliases


Windows Defender  detects and removes this threat.

This ransomware can stop you from using your PC or accessing your data. It might ask you to pay money to a malicious hacker.

This threat can be downloaded by Angler EK (Exploit:JS/Axpergle or Exploit:SWF/Axpergle) and written to the Temp directory as api-ms-win-system-<any string>-l1-1-0.dll (for example: api-ms-win-system-ndishc-l1-1-0.dll or api-ms-win-system-wcnwiz-l1-1-0.dll) to appear like it is a valid system file.

Our ransomware page has more information on this type of threat.

There is no one-size-fits-all response if you have been victimized by ransomware. There is no guarantee that paying the ransom will give you access to your files.

To decrypt Exxroute-encrypted files, you can also use this tool from Kaspersky Lab, as discussed in their How to unlock a .crypt file blog.

If you've already paid, see our ransomware page for help on what to do now.

However, know that this ransomware attack can be prevented since it is carried by a macro and it comes in from the email infection vector. See the guidance below:

Configure your Trust Center to disable macros

Set your Trust Center in Microsoft Office programs to 'Disable all except digitally signed macros' to control potential macro installations on machines in your network. Know that some malware would try to get into your system through macros, which usually comes in through the email infection vector. 

See the Office support page to Enable or disable macros in Office files for details. Administratively disabling macros can help prevent malware-ridden macros from downloading ransomware or other threats onto your machine or your network.

For more details about macros, ransomware, advanced persistent threats, and how you can protect your enterprise from them, see the following report and video:

Use Office 365 Advanced Threat Protection

Use Office 365's machine learning capability to help your network administrators block dangerous email threats. See the Overview of Advanced Threat Protection in Exchange: new tools to stop unknown attacks, for details.

Use cloud protection

The Microsoft Active Protection Service (MAPS) uses cloud protection to help guard against the latest malware threats. It’s turned on by default for Microsoft Security Essentials and Windows Defender for Windows 10. 

Run antivirus or antimalware software

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

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

Advanced troubleshooting

To restore your PC, you might need to download and run Windows Defender Offline. See our advanced troubleshooting page for more help.

You can also ask for help from other PC users at the Microsoft virus and malware community.

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