Troj/Haxdoor-DD

Category	Viruses and Spyware
Type	Trojan
What to do	If you've received an alert for a virus or spyware, then follow the instructions for removing the threat.
Prevalence	low high

Summary


Affected operating systems	Windows
Characteristics	Installs itself in the registry
Protection available since	13 September 2006 12:56:38 (GMT)
Detected by	All Sophos products

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Troj/Haxdoor-DD is a backdoor Trojan for the Windows platform.

When Troj/Haxdoor-DD is installed the following files are created:

<System>\ksl48.bin
<System>\scsipsrvc.sys
<System>\scsiusr4.dll

scsipsrvc.sys and scsiusr4.dll are both detected as Troj/Haxdoor-DD. ksl48.bin is an empty file.

Troj/Haxdoor-DD includes functionality to:

- stealth its files, processes and registry entries
- inject its code into other processes

Troj/Haxdoor-DD modifies the HOSTS file, changing the URL-to-IP mappings for selected websites, therefore preventing normal access to these sites.

The following registry entries are created to run code exported by scsiusr4.dll on startup:

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\scsiusr4
DllName
scsiusr4.dll

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\scsiusr4
Startup
scsiusr4

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\scsiusr4
Impersonate
1

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