A new variant of the Waledac worm has been detected that offers SMS snooping technology.
The Websense ThreatSeeker Network detected the new variant that is being distributed via email that uses a theme where the user is enticed to download an application that will permit them to view other people's SMS messages online.
Websense threat research manager Carl Leonard, said: “They are playing on people's nosey or suspicious nature, however the application doesn't give the user the ability to spy on other people's SMS messages. Instead it installs a number of executable files to incorporate the user's machine into Waledac's botnet. The irony is quite fitting, the user intended to spy on others but ends up being compromised themselves.”
PandaLabs' Asier Martinez claimed that the main function of the Waledac family, besides its own propagation, is to send spam messages to the email accounts obtained from the infected computer.
Martinez said: “Additionally, it can carry out other malicious actions, such as downloading malware, opening ports in order to receive instructions (acting as a botnet) and stealing passwords which are then sent to remote URLs.”
MX Logic's Sam Masiello claimed that the messages contain a link to a website where users can download a 30-day free trial for a piece of software that when installed on your partner's mobile phone will allow you to read all of the SMS messages that they receive.
Masiello said: “It is important to note that by simply visiting the website does not infect the user with Waledac. They must download and execute the file (currently named "sms.exe") after clicking the ‘Download Free Trial Link'.”
MX Logic claimed that downloads were in the 2-4k range per hour until about 2am MST this morning, before peaking at about 12,000 around the 6am hour.