W32/Tilebot-KT

Please follow the instructions for removing worms.

W32/Tilebot-KT is a worm for the Windows platform.

W32/Tilebot-KT spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: RPC-DCOM (MS04-012), and ASN.1 (MS04-007). The worm may also spreads via network shares protected by weak passwords.

W32/Tilebot-KT 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-KT copies itself to <System>\photoshop.exe and creates the file <Temp>\1.reg. The file 1.reg is not malicious and may be deleted.

The following registry entries are created to run photoshop.exe on startup:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Adobe Photoshop
photoshop.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Adobe Photoshop
photoshop.exe

The following registry entry is set, affecting internet security:

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\
StandardProfile\AuthorizedApplications\List
DEFGHIJKLMNOPQRSTUVWXYZ[\]^_`ABCDEFGHIJKLMNOPQRSTUVWXYZ
{|}~€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™Š›ŒŽŸ ¡¢£¤¥¦§¨©ª«¬­®¯Äü
DEFGHIJKLMNOPQRSTUVWXYZ[\]^_`ABCDEFGHIJKLMN

W32/Tilebot-KT sets the following registry entries, disabling the automatic startup of other software:

HKLM\SYSTEM\CurrentControlSet\Services\wuauserv
Start
4

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4

Note: disabling autostart for the SharedAccess service deactivates the Microsoft Internet Connection Firewall (ICF).

Registry entries are set as follows:

HKCU\Software\Microsoft\OLE
Adobe Photoshop
photoshop.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings
MaxConnectionsPer1_0Server
50

HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings
MaxConnectionsPerServer
50

HKLM\SOFTWARE\Microsoft\Ole
EnableRemoteConnect
N

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N