W32/Sdbot-BLW is a network worm and IRC backdoor Trojan for the Windows platform.
W32/Sdbot-BLW spreads to remote network shares protected by weak passwords and to computers vulnerable to common exploits, including LSASS (MS04-011), RPC-DCOM (MS04-012), PNP (MS05-039) and ASN.1 (MS04-007).
W32/Sdbot-BLW includes functionality to access the internet and communicate with a remote server via HTTP.
When first run W32/Sdbot-BLW copies itself to <System>\netbtd.exe.
The file netbtd.exe is registered as a new system driver service named "NetBTD", with a display name of "NetBTD(ntbtd)" and a description of"Net bios background information transfer 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\NetBTD\
HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_NETBTD\
W32/Sdbot-BLW sets the following registry entries, disabling the automatic startup of other software:
HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
AutoShareServer
0
HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
AutoShareWks
0
HKLM\SYSTEM\CurrentControlSet\Services\lanmanworkstation\parameters
AutoShareServer
0
HKLM\SYSTEM\CurrentControlSet\Services\lanmanworkstation\parameters
AutoShareWks
0
HKLM\SYSTEM\CurrentControlSet\Services\wscsvc
Start
4
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\Microsoft\Security Center
AntiVirusDisableNotify
1
HKLM\SOFTWARE\Microsoft\Security Center
AntiVirusOverride
1
HKLM\SOFTWARE\Microsoft\Security Center
FirewallDisableNotify
1
HKLM\SOFTWARE\Microsoft\Security Center
FirewallOverride
1
HKLM\SOFTWARE\Microsoft\Security Center
UpdatesDisableNotify
1
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile
EnableFirewall
0
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile
EnableFirewall
0
HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
DoNotAllowXPSP2
1
HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N
HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1