BKDR_SDBOT.EUX

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes the initially executed copy of itself.

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This backdoor drops the following copies of itself into the affected system:

• %System%\csrsc.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Autostart Technique

This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_WINSPOOLSVC\
0000
Service = "WinSpoolSvc"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinSpoolSvc
ImagePath = "%System%\csrsc.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinSpoolSvc
DisplayName = "Windows Spool Services"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_WINSPOOLSVC

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinSpoolSvc

Other Details

This backdoor deletes the initially executed copy of itself