Meanwhile, it replaces the user transaction history/balance details to hide the fraudulent activities from the victim. Tatanga then captures the TAN entered by the user at the bank site and proceeds to make a transaction in the background. Note: Also check the display of the TAN generator always using the original transaction data - for example, an invoice. Check the transaction details (recipient’s account number, recipient’s bank and amount of the transfer) on the reader screen and then confirm by clicking “OK” on your TAN generator.Check the display on the reader display, and press “OK.”.Here, the markings (triangles) of the graph correspond to those on your TAN generator. Place the TAN generator next to the animated graphic on your computer screen.Insert your smart card into the TAN generator and press “F.”.Hinweis: Uberprufen Sie die Anzeige des TAN-Generators immer anhand der Original-Transaktions-Daten – z.B. Prüfen Sie die Hinweise (Empfänger-Kontonummer (ohne führende Nullen), Bankleitzahl des Empfängers und Betrag) auf dem Leserdisplay und bestätigen diese dann jeweils mit “OK” auf Ihrem TAN-Generator.Prüfen Sie die Anzeige auf dem Leserdisplay und drücken “OK.”.Dabei müssen die Markierungen (Dreiecke) von der Grafik mit denen auf Ihrem TAN-Generator übereinstimmen. Halten Sie den TAN-Generator vor die animierte Grafik.Stecken Sie Ihre Chipkarte in den TAN-Generator und drücken “F.”.These are the instructions through which it steals user information, as they appear in German: The fake instructions request that the user generate a TAN for the purpose of this “test” and enter the TAN. At this point, Tatanga uses a webinject to trick the user into believing that the bank is performing a chipTAN test. It then chooses the account from which it could steal the highest amount. Tatanga checks the user account details, including the number of accounts, supported currencies and balance/limit details. These systems require that the bank card for the account be inserted in the device to generate a TAN that is specific to the current transaction. IBM has discovered a new Tatanga attack against chipTAN systems used by banks in Germany, which generates unique transaction authentication numbers (TAN).
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