Panda Security, The Cloud Security Company, has uncovered a new massive attack on Android users. This is a highly elaborate ploy that originates on Facebook, where cyber-criminals advertise a series of apps. Panda Security has contacted Facebook to warn of this malicious advertising campaign on the popular social network.
Trojan apps
When users access Facebook from their Android mobile device, they will see different messages under the title âSuggested Postâ advertising WhatsApp tips like: “Want to know how to see your contactsâ chats on WhatsApp? Find out here!â or “Want to hide your WhatsApp connection status? Download this app so people canât see youâ. If the intended victim clicks on any of these ads, they are redirected to a fake version of Google Play, the Android app store. The user, thinking that this is the genuine site, downloads the free app, which is really a Trojan that subscribes users to a premium-rate SMS service without their knowledge.
âIn this attack, cyber-criminals have taken advantage of Facebookâs targeted advertising options. In this case, the ad is only shown to Spanish Facebook users who are accessing the social network from an Android mobile device. We carried out tests using the same account from a PC, an iPad, an iPhone and Android and the ads were only displayed when using the Google operating system”, said Luis Corrons, Technical Director of PandaLabs at Panda Security.
The Trojan checks all inbound messages received on the device and if the sender is the premium-rate SMS service, the message is intercepted and deleted so the user is unaware. Yet this technique doesnât work with the latest 4.4 (KitKat) version of Android, so the creators have come up with an ingenious trick to overcome this: when the message is received, the phone volume is muted for two seconds and the inbound message is marked as read. The app includes an SMS counter, so when the first message is received from the premium-rate service, it reads it to get the confirmation PIN and registers the user on the corresponding website to activate the premium-rate SMS service.
Anti-competition
The Trojan also deletes any messages sent from the number 22365, another number associated with premium-rate SMS services, although from a company apparently unrelated to this attack. All signs would suggest that this is designed to protect against a specific competitor: if another Trojan tried to register to an SMS service it wouldnât be able to access the confirmation message and consequently it couldnât access the PIN and activate the service.
The cyber-criminals are not just using WhatsApp as bait, but also any topic that could attract users: âamazing videosâ, Candy Crush tricks, Angry Birds tricks, etc.
Panda Mobile Security offers protection
Thanks to Panda Mobile Security 1.1 and its âPrivacy Auditâ feature, any app with these potentially dangerous profiles will be classified as âCost moneyâ and can be deleted directly from that section. That said, not all apps in this category are malicious: any app with sufficient permissions to operate in the way described above will be in this category. If users discover an app installed that shouldnât have these permissions, they should delete it immediately.Â
More details on the PandaLabs blog
Panda Security specializes in the development of endpoint security products and is part of the WatchGuard portfolio of IT security solutions. Initially focused on the development of antivirus software, the company has since expanded its line of business to advanced cyber-security services with technology for preventing cyber-crime.
