W32/Tilebot-KR is a worm with IRC backdoor functionality for the Windows platform.
W32/Tilebot-KR 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/Tilebot-KR copies itself to <System>\spoolvc.exe.
The file spoolvc.exe is registered as a new system driver service named "Task Restore Service" with a startup type of automatic. Registry entries are created under:
HKLM\SYSTEM\CurrentControlSet\Services\Task Restore Service
W32/Tilebot-KR sets the following registry entries, disabling the automatic startup of other software:
HKLM\SYSTEM\CurrentControlSet\Services\Messenger
Start
4
HKLM\SYSTEM\CurrentControlSet\Services\RemoteRegistry
Start
4
HKLM\SYSTEM\CurrentControlSet\Services\TlntSvr
Start
4
Registry entries are set as follows:
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile
EnableFirewall
0
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile
EnableFirewall
0
HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
DoNotAllowXPSP2
1
HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N
Registry entries are created under:
HKLM\SOFTWARE\Microsoft\Security Center