Troj/PPdoor-O

Aliases	BackDoor-CHC trojan
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
Included in our products from	October 2005 (3.98)
Protection available since	14 August 2005 15:53:19 (GMT)
Detected by	All Sophos products

Troj/PPdoor-O is a backdoor Trojan for the Windows platform.

When Troj/PPdoor-O is installed the following files are created:

<System>\hgakheg.dll
<System>\ydyzjmaa.dll

Both DLL files are non-executable and can be deleted.

The following registry entries are created to run the Trojan and any exported library code on startup:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Terminal Update
<System>\biosefui.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\
ShellServiceObjectDelayLoad
Terminal Agent
<random classid>

Troj/PPdoor-O will listen for backdoor commands and may also act as a SOCKS, mail and P2P proxy.

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