W32/Sdbot-ABX is a worm and IRC backdoor Trojan for the Windows platform.
W32/Sdbot-ABX spreads to other network computers infected with W32/MyDoom. W32/Sdbot-ABX also spreads to network shares with weak passwords.
W32/Sdbot-ABX runs continuously in the background, providing a backdoor server which allows a remote intruder to gain access and control over the computer via IRC channels.
When first run W32/Sdbot-ABX copies itself to <System>\msrf32.exe.
The following registry entries are created to run msrf32.exe on startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Windows32 Configuration Loader
msrf32.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Windows32 Configuration Loader
msrf32.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Windows32 Configuration Loader
msrf32.exe