Brain

 

Believed to be the first computer virus for MS-DOS, Brain was released in 1986 and infected the boot sector of storage media, primarily floppy disks, formatted with DOS File Allocation Table (FAT). The boot sector was moved to another sector and marked as bad. Meanwhile, text was written into the infected sectors, which, remarkably, included the virus authors’ names and telephone numbers.

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Tinba

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  Tinba was first discovered in 2012. The name stands for the Tiny Banker Trojan. As a modified version of older Banker Trojans, it was developed to target the websites of financial institutions. The main goal was to collect clients’ information, such as PIN codes, usernames, account details, passwords, and credit card numbers. Tinba is based on network sniffing and man-in-the-browser attacks. It is indeed tiny — 20 KB — and it is what made the Trojan difficult to detect. 
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