high
Summary
Summary
Action- More Information
| How it spreads |
|
|---|---|
| Affected operating systems | Windows |
| Characteristics |
|
| Included in our products from | July 2005 (3.95) |
| Protection available since | 1 June 2005 20:41:55 (GMT) |
| Detected by | All Sophos products |
Action
- Summary
- Action
- More Information
Please follow the instructions for removing worms.
More Information
W32/Sdbot-YX is an internet worm with IRC backdoor functionality for the Windows platform.
W32/Sdbot-YX spreads to other network computers by exploiting common buffer overflow vulnerabilites, including: LSASS (MS04-011), RPC-DCOM (MS04-012), WKS (MS03-049), MSSQL (MS02-039) and WINS (MS04-045) and by copying itself to network shares protected by weak passwords.
W32/Sdbot-YX 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/Sdbot-YX includes functionality to carry out DDoS flooder attacks, silently download, install and run new software and disable anti-virus and security related applications.
When first run W32/Sdbot-YX copies itself to <Windows system folder>\abl.exe and creates the following registry entries to ensure it is run at system logon:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Service Drivers
abl.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
Service Drivers
abl.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Service Drivers
abl.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Service Drivers
abl.exe
W32/Sdbot-YX also creates the following registry entries:
HKCU\Software\Microsoft\Ole
Service Drivers
abl.exe
HKCU\System\CurrentControlSet\Control\Lsa
Service Drivers
abl.exe
HKLM\Software\Microsoft\Ole
Service Drivers
abl.exe
HKLM\System\CurrentControlSet\Control\Lsa
Service Drivers
abl.exe
and sets the following registry entries:
HKLM\Software\Microsoft\Ole
EnableDCOM
N
HKLM\System\CurrentControlSet\Control\Lsa
restrictanonymous
1
HKLM\System\CurrentControlSet\Services\wuauserv
Start
4
HKLM\System\CurrentControlSet\Services\SharedAccess
Start
4
W32/Sdbot-YX also creates the file msdirectx.sys which is detected by Sophos as Troj/NtRootK-F.
The following patches for the operating system vulnerabilities exploited by W32/Sdbot-YX can be obtained from the Microsoft website:
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