Security firms have uncovered a rogue Trojan masquerading as popular photo sharing service Instagram's Android app.
The Android Trojan targets smartphone users infecting their devices and instructing them to silently send SMS messages to premium rate services.
It was spotted by security vendors Trend Micro and Sophos on a Russian website purporting to be an affiliate of Instagram. The app has not been seen on the official Google Play Android marketplace.
Both Trend Micro and Sophos noted that the Trojan's discovery comes amid a wider boom in fake apps targeting the Android ecosystem.
"For the past few days, we have been seeing several other Russian domains hosting fake webpages posing as download pages for some popular Android apps" said Trend Micro analyst Karla Agregado in a blog post.
"Android malware is becoming a bigger and bigger problem," Sophos analyst Graham Cluley said in a blog post.
The malware's discovery follows on from Facebook's high profile $1bn acquisition of Instagram, which was announced earlier in April.
Prior to its discovery a number of other malicious apps have been discovered, including a fake version of Rovio's popular Angry Birds game.
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