W32/Poebot-C

Please follow the instructions for removing worms.

Check your administrator passwords and review network security.

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\
Windows DLL Loader
"<Windows system folder>\defragfat39.exe"

and delete it if it exists.

Close the registry editor.

W32/Poebot-C is a network worm and IRC backdoor Trojan for the Windows platform.

When first run, W32/Poebot-C copies itself to the Windows system folder as defragfat39.exe and creates the following registry entry in order to run each time a user logs on:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Windows DLL Loader
"<Windows system folder>\defragfat39.exe"

The backdoor component of W32/Poebot-C joins an IRC channel and awaits further commands from a remote user. The attacker can issue commands that cause W32/Poebot-C to perform the following functions:

take part in distributed denial of service (DDoS) attacks
packet sniffing
steal software product registration information
start an FTP server
hijack FTP client software
start a port scanner
list/terminate system processes and services

W32/Poebot-C spreads through network shares protected by weak passwords and through the LSASS vulnerability (MS04-011). Patches for vulnerabilities exploited by W32/Poebot-C can be obtained from Microsoft at:

http://www.microsoft.com/technet/security/bulletin/MS04-011.mspx