W32/Sdbot-YC

Please follow the instructions for removing worms.

You will also need to edit the following registry entries, if they are present. Please read the warning about editing the registry.

At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.

Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.

Locate the HKEY_LOCAL_MACHINE entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices

and remove any reference to any file you deleted.

Each user has a registry area named HKEY_USERS\[code number indicating user]\. For each user locate the entry:

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\Run\

and remove any reference to any file you deleted.

Close the registry editor.

W32/Sdbot-YC is a network worm which allows a remote intruder to gain access and control over the computer via IRC channels.

When first run the Trojan copies itself to <Windows system folder>\aqujyjax.exe.

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

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Aqujyjax
aqujyjax.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Aqujyjax
aqujyjax.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Aqujyjax
aqujyjax.exe

W32/Sdbot-YC attempts to spread the file idaley.exe to network shares protected by weak passwords. This file is detected as W32/Sdranck-D.

W32/Sdbot-YC's backdoor functionality allows a remote attacker to execute arbitrary commands and to download files from a specified URL to the infected computer.

Sophos's anti-virus products include Genotype ™ detection technology, which can proactively protect against new threats without requiring an update. Sophos customers have been protected against W32/Sdbot-YC (detected as W32/Sdbot-Fam) since version 3.85.