W32/Sdbot-AAC

Category: Viruses and Spyware
Type: Win32 worm
Prevalence: No Reports

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W32/Sdbot-AAC is a worm with backdoor functionality for the Windows platform.

W32/Sdbot-AAC 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/Sdbot-AAC copies itself to <Windows system folder>\xpspz.exe and also creates msdirectx.sys.

The file msdirectx.sys is detected as Troj/NtRootK-F.

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

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Windows-XP-Service-Pack
xpspz.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Windows-XP-Service-Pack
xpspz.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Windows-XP-Service-Pack
xpspz.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Windows-XP-Service-Pack
xpspz.exe

W32/Sdbot-AAC might try to terminate Anti-Virus applications and block access to security related web-sites.

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

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4

HKLM\SYSTEM\CurrentControlSet\Services\wuauserv
Start
4

Registry entries are set as follows:

HKCU\SYSTEM\CurrentControlSet\Control\Lsa
Windows-XP-Service-Pack
xpspz.exe

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
Windows-XP-Service-Pack
xpspz.exe

HKCU\Software\Microsoft\OLE
Windows-XP-Service-Pack
xpspz.exe

HKLM\SOFTWARE\Microsoft\Ole
Windows-XP-Service-Pack
xpspz.exe

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1