W32/Sdbot-AGK

Please follow the instructions for removing worms.

W32/Sdbot-AGK is a worm and IRC backdoor Trojan for the Windows platform.

W32/Sdbot-AGK spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: RPC-DCOM (MS04-012), PNP (MS05-039) and ASN.1 (MS04-007) and by copying itself to network shares protected by weak passwords.

W32/Sdbot-AGK 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-AGK copies itself to <Windows>\nakedx.exe.

The following registry entries are created to run nakedx.exe on startup:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
GoOutside
nakedx.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
GoOutside
nakedx.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
GoOutside
nakedx.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
GoOutside
nakedx.exe

W32/Sdbot-AGK sets the following registry entries, disabling the automatic startup of other software:

HKLM\SYSTEM\CurrentControlSet\Services\wuauserv
Start
4

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4

Note: disabling autostart for the SharedAccess service deactivates the Microsoft Internet Connection Firewall (ICF).

Registry entries are set as follows:

HKCU\SYSTEM\CurrentControlSet\Control\Lsa
GoOutside
nakedx.exe

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
GoOutside
nakedx.exe

HKCU\Software\Microsoft\OLE
GoOutside
nakedx.exe

HKLM\SOFTWARE\Microsoft\Ole
GoOutside
nakedx.exe

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1