A Trojan is a program that enables an attacker to get nearly complete control over an infected PC. Frequently used tool by malicious hackers. When this program executes, the program performs a specific set of actions. This usually works toward the goal of allowing the trojan to survive on a system and open up a backdoor.
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Downloader.ab copies itself to %WINDIR%\System32 with a random name. It then tries to download a file and execute it.
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