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W32.Randex.gen (Symantec), Backdoor/SDBot, Backdoor.SdBot.jg (Kaspersky), W32/Sdbot.worm.gen.i (McAfee)
Win32.Rbot is an IRC controlled backdoor (or "bot") that can be used to gain unauthorized access to a victim's machine. It can also exhibit worm-like functionality by exploiting weak passwords on administrative shares and by exploiting many different software vulnerabilities, as well as backdoors created by other malware. This particular variant of this increasingly large family has been distributed as a 69,120-byte, UPX-packed Win32 executable.
When first run, Rbot.H copies itself into the %System% directory as msconfg.exe.
It then adds entries to the following registry keys so that it is automatically run each time Windows starts:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\Microsoft Update = "msconfg.exe"
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Microsoft Update = "msconfg.exe"
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\Microsoft Update = "msconfg.exe"
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