Several malicious Android apps designed to steal mobile transaction authentication numbers (mTANs) sent by banks to their customers over SMS were found on Google Play by researchers from antivirus vendor Kaspersky Lab.
Many banks use mTANs as a security mechanism to prevent cyber criminals from transferring money from compromised online banking accounts. When a transaction is initiated the bank sends a unique code called an mTAN via SMS to the account owner's phone number. The account owner has to input that code back into the online banking website in order for the transaction to be authorized.
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This occurrence means that banks need to reconsider the use of SMS and mobile users can no longer trust app stores when downloading new apps.