The source code for the first version of Tinba, the smallest banking Trojan ever, has been discovered by researchers on an underground forum.Also known as Tinybanker or Zusy, the malware is just 20KB in size, and has been first discovered at the middle of 2012, when it targeted individuals in Turkey. More than 60,000 unique infections were identified.Apart from this, what immediately captured the attention of the security researchers was its small size and its functionality rivaling much large…