Welcome to the Virus Encyclopedia of Panda Security.
SMSlock.A is a Trojan designed to affect mainly Russian speaking users and whose main aim is to obtain financial gains.
In order to do so, it locks the affected users' computer and it will not be unlocked until they send an sms to a certain number with a random text.
SMSlock.A does not spread automatically using its own means. It needs an attacking user's intervention in order to reach the affected computer.
SMSlock.A is easy to recognize, as when it is run, it displays the following message in Russian, informing users that their computer will be locked until they send an sms to the number 3649 with a random text: