W32/Tilebot-GM is a worm and IRC backdoor Trojan for the Windows platform.
W32/Tilebot-GM spreads to other network computers by exploiting common buffer overflow vulnerabilities.
W32/Tilebot-GM 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.
W32/Tilebot-GM includes functionality to access the internet and communicate with a remote server via HTTP.
When first run W32/Tilebot-GM moves itself to <Windows>\lsass.exe and creates the file <System>\rdriv.sys.
The file lsass.exe is registered as a new system driver service named "lsass", with a display name of "Local Security Authority Subsystem Service" and a startup type of automatic, so that it is started automatically during system startup. Registry entries are created under:
HKLM\SYSTEM\CurrentControlSet\Services\lsass
The file rdriv.sys is registered as a new system driver service named "rdriv", with a display name of "rdriv". Registry entries are created under:
HKLM\SYSTEM\CurrentControlSet\Services\rdriv\
W32/Tilebot-GM 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\Windows\WindowsUpdate
DoNotAllowXPSP2
1
HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N
HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1
The following registry entries may be modified:
HKLM\SOFTWARE\Microsoft\Security Center\
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile\
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile\