Troj/Hzdoor-A

Please follow the instructions for removing Trojans.

Windows NT/2000/XP/2003

In Windows NT/2000/XP/2003 you will also need to edit the following registry entry. The removal of this entry is optional in Windows 95/98/Me. 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 entry:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
nortonsantivirus
"<Windows system folder>\ccEvtMngr.exe"

and delete it if it exists.

Close the registry editor.

Troj/Hzdoor-A is a backdoor Trojan for the Windows platform.

When first run Troj/Hzdoor-A copies itself to the Windows system folder as ccEvtMngr.exe and creates the following registry entry in order to run each time a user logs on:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
nortonsantivirus
"<Windows system folder>\ccEvtMngr.exe"

The Trojan joins an IRC channel and awaits further commands from a remote user. Troj/Hzdoor-A can then be instructed to perform the following functions:

start an FTP server
start a port scanner
modify the system registry
download/execute arbitrary files
harvest system information

Troj/Hzdoor-A drops a file to the Windows system folder as ccSetMngr.exe and then runs it. The dropped file exploits a buffer overflow vulnerability in Microsoft servers running the WINS service. Successful exploitation of this exploit results in the server allowing remote shell access. A patch is available from Microsoft for the WINS buffer overflow vulnerability at:

http://www.microsoft.com/technet/security/bulletin/MS04-045.mspx

Sophos Anti-Virus products detect ccSetMngr.exe as Troj/Winser-A.