Troj/Small-ER

Aliases	Trojan-Downloader.Win32.Small.bug Downloader-GS
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
Included in our products from	December 2005 (4.00)
Protection available since	1 November 2005 15:28:44 (GMT)
Detected by	All Sophos products

Troj/Small-ER is a backdoor Trojan which can be used as a proxy and
is capable of downloading and executing arbitrary files.

Troj/Small-ER drops child.dll in the Windows system folder and sets the
following registry entries to ensure startup on system logon.

HKCR\CLASSES\CLSID\(4F141CBA-1457-6CCA-03A7-7AA21B61EA0F)
InProcServer32
<System>\child.dll

HKCR\CLSID\(4F141CBA-1457-6CCA-03A7-7AA21B61EA0F)
InProcServer32\ThreadingModel
Apartment

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ SharedTaskScheduler\
(4F141CBA-1457-6CCA-03A7-7AA21B61EA0F)
OutPost FireWall

To avoid detection, Troj/Small-ER may delete netlog.exe on startup.

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