A new instant-messaging pest that spreads using the chat feature in Skype has surfaced, security firm F-Secure warned Monday.

The worm, dubbed Pykse.A, is similar to threats that affect instant-messaging applications. A targeted Skype user will receive a chat message with text and a Web link that looks like it goes to a JPEG file on a Web site, F-Secure said on its Web site.

Clicking the link will redirect the user to a malicious file. The file, after executing, will send a malicious link to all online contacts in a Skype user’s list and will show a picture of a scantily clad woman, F-Secure said. In addition, it sets the user’s Skype status message to “Do Not Disturb,” the security firm said.

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