Troj/Sdbot-DOS is a Trojan for the Windows platform.
Troj/Sdbot-DOS 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 Troj/Sdbot-DOS copies itself to <System>\vdehost.exe and creates the following files:
<System>\drivers\npf.sys
<System>\packet.dll
<System>\wpcap.dll
The following registry entries are created to run vdehost.exe on startup:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Data File
vdehost.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Data File
vdehost.exe
The file npf.sys is registered as a new system driver service named "NPF", with a display name of "Netgroup Packet Filter". Registry entries are created under:
HKLM\SYSTEM\CurrentControlSet\Services\NPF
Registry entries are set as follows:
HKCU\Software\Microsoft\OLE
Data File
vdehost.exe
HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
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