Threat Description



Category: Malware
Type: Virus
Platform: W32
Aliases: W-13


This is a Vienna-derived virus, virus, but it marks infected files by setting the "month" field to 13, instead of setting the "seconds" field to 62. W-13 has been reported to have originated in Russia as well as in Poland.

A 507 bytes variant with some bugs corrected is also known.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details


CSSR 528, IKV 528

This East-European virus is related to the W-13 viruses, but it has not been fully analyzed yet.

Variant:W-13 C

This is a minor modification of the 507 byte variant mentioned above. It will set the "month" field to 12, which makes it less obvious, as 12 is a legal value, but this also makes all files created in December immune to infection.


A 494 byte variant from Poland - Not yet analyzed.


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