W32/Tilebot-EM

Please follow the instructions for removing worms.

W32/Tilebot-EM is a network worm and backdoor Trojan for the Windows platform.

W32/Tilebot-EM spreads to remote network shares protected by weak passwords and to computers vulnerable to common exploits, including LSASS (MS04-011), RPC-DCOM (MS04-012) and ASN.1 (MS04-007).

W32/Tilebot-EM includes functionality to access the internet and communicate with a remote server via HTTP.

When first run W32/Tilebot-EM copies itself to \emape.exe and creates the following files:

<CurrentFolder>\aspr_keys.ini
<System>\rofl.sys

The file rofl.sys is detected as Troj/RKPort-A. The file aspr_keys.ini may be deleted.

The file emape.exe is registered as a new system driver service named "EMAP Service", with a display name of "EMAP 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\EMAP Service\

The file rofl.sys is registered as a new system driver service named "rofl", with a display name of "rofl". Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\rofl\

W32/Tilebot-EM 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

Registry entries are created under:

HKLM\SOFTWARE\Microsoft\Security Center\
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile\
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile\