W32/Sdbot-AFM is a worm and IRC backdoor for the Windows platform.
W32/Sdbot-AFM may spread over network shares, instant messaging programmes, and via weak SQL passwords.
W32/Sdbot-AFM 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-AFM includes functionality to access the internet and communicate with a remote server via HTTP.
When first run W32/Sdbot-AFM copies itself to <Windows folder>\csr.exe.
The file csr.exe is registered as a new system driver service named "csrss32", with a display name of "Client Server Runtime 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\csrss32\
W32/Sdbot-AFM 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\