Troj/Small-ED

Please follow the instructions for removing Trojans.

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.

Troj/Small-ED is a backdoor Trojan which runs in the background as a service process and allows unauthorised remote access to the computer via an opened port.

When run the Trojan copies itself to the Windows system folder as atipatxx.exe and creates the following registry entries to run itself on user logon:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
atipatxx
%SYSTEM%\atipatxx.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
atipatxx
%SYSTEM%\atipatxx.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
atipatxx
%SYSTEM%\atipatxx.exe

Troj/Small-ED also creates the following registry entry:

HKLM\SOFTWARE\Microsoft
ATI_VER
<random number>

The Trojan then opens a TCP port, listening for commands from remote users. If it receives the appropriate command the Trojan attempts to:

act as a HTTP Proxy server, redirect network traffic
participate in denial of service (DoS) attacks
download files from the internet and run them