Sdbot.RPC.A is an IRC controlled backdoor which contains spreading routines exploiting the MS03-026 (also known as DCOM/RPC) vulnerability.
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After entering the system Sdbot.RPC.A installs itself with the following steps:
[Boot] Shell=explorer.exe winlogin.exe
The backdoor code is based on Sdbot. It connects to a predefined IRC server and joins a channel and waits for commands. Commands it supports provide full access to the compromised computer.
With one of the commands the backdoor can be instructed to scan for vulnerable hosts using the DCOM/RPC exploit. If a vulnerable host is found Sdbot.RPC.A infects the host.
More information on the DCOM/RPC (MS03-026) vulnerability is available at