One-time passcodes intercepted by a malware program from Android


According to a new research from Symantec, One-time passcodes which are crucial defense for online banking applications, are being intercepted by a malware program for Android. Android.Banksoy, the malware has been updated to intercept the codes, which are the part of so-called two factor authentication systems.

Many online banking applications require a login and password plus a time-sensitive code in order to gain access. The one-time passcode is sent over SMS but also can be delivered via an automated phone call.

Dinesh Venkatesanof Symantec, wrote in a bolg post that “Some banks have moved to call-based delivery of passcodes. In theory, that provides better security since SMS messages can be intercepted by some malware, but Bankosy has been updated to forward all calls to the attackers.  In the Asia-Pacific region, many operators use a service code in the format *21*[destination number]# to forward calls, which Bankosy has implemented. The malware also has support for disabling and enabling silent mode in addition to locking the device so that the victim is not alerted during an incoming call”.

These one-time passcode is used with the victim’s login credentials, which the attackers have presumably already obtained. Symantec detected Bankosy in July 2014. A technical writeup from that time shows the malware also prompted victims to enter their payment card information in a more bold attempt at fraud.


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