All 13 suspected apps are free for the downloading.
Symantec's researchers have told Google of their discovery, said Haley. Google, however, did not immediately reply to questions and a request for confirmation on the security firm's claims.
Haley said Symantec's researchers are still "peeling back the layers of the onion," and added that the company would publish more information on the threat as it unearthed details. "What's interesting here is that instead of taking legitimate apps, [malware authors] have created apps similar to legitimate ones," said Haley. "That, and the big numbers of downloads, of course."
Symantec has published a list of the 13 infected apps on its website.
Sign up for MIS Asia eNewsletters.