W32/Tilebot-BP is a worm and IRC backdoor Trojan for the Windows platform.
The worm spreads using a variety of techniques including exploiting weak
passwords on computers and SQL servers, exploiting operating system
vulnerabilities LSASS (MS04-011), RPC-DCOM (MS04-012), PNP (MS05-039) and
ASN.1 (MS04-007).
W32/Tilebot-BP 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.
The backdoor component of W32/Tilebot-BP can be instructed by a remote user to
perform the following functions:
collect internet and email account information
download/execute arbitrary files
packet sniffing
port scanning
start a remote shell (RLOGIN)
start an FTP server
take part in distributed denial of service (DDoS) attacks
W32/Tilebot-BP includes functionality to access the internet and communicate
with a remote server via HTTP.
When first run W32/Tilebot-BP copies itself to <Windows>\msclient.exe, and
creates the following files:
<System>\rofl.sys
the file msclient.exe is registered as a new system driver service named
"Microsoft Client Agent", with a display name of "Microsoft Client Agent
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\Microsoft Client Agent\
The file rofl.sys is registered as a new system driver service named "rofl",
with a display name of "rofl". The rofl.sys file is detected by Sophos's
Anti-Virus products as Troj/RKPort-A. Registry entries are created under:
HKLM\SYSTEM\CurrentControlSet\Services\rofl\
W32/Tilebot-BP 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\