TR/Proxy.Horst.HR.21 - Trojan

See also

Summary

Full description

Statistics

Virus:	TR/Proxy.Horst.HR.21
Date discovered:	04/09/2006
Type:	Trojan
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	48.640 Bytes
MD5 checksum:	3678147d79a104e22a6c78f8c72b3f78
VDF version:	6.35.01.179 - Mon, 04 Sep 2006 16:31 (GMT+1)
IVDF version:	6.35.01.183 - Tue, 05 Sep 2006 13:39 (GMT+1)

General Method of propagation:
   • No own spreading routine

Alias:
   • Kaspersky: Trojan-Proxy.Win32.Horst.hr

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Disable security applications
   • Downloads malicious files
   • Drops files
   • Registry modification
   • Third party control

Files It copies itself to the following location:
• %WINDIR%\system\smss.exe

The following files are created:

– %SYSDIR%\nvsvcd.exe
– %TEMPDIR%\tmp1.tmp

Registry The following registry key is added in order to run the process after reboot:

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   • ".nvsvc"="%WINDIR%\system\smss.exe /w"

The following registry keys are added in order to load the service after reboot:

– HKLM\SYSTEM\CurrentControlSet\Services\Windows Log
   • "Type"=dword:00000010
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000001
   • "ImagePath"=%SYSDIR%\nvsvcd.exe
   • "DisplayName"="Windows Log"
   • "ObjectName"="LocalSystem"

The value of the following registry key is removed:

– HKLM\Software\Microsoft\Windows\CurrentVersion\Run
   • KAVPersonal50

IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: pid.faretun.**********
Port: 80
Nickname: jebt-1_%four-digit random character string%_%four-digit random character string%

Server: sir.carekor.**********
Port: 80
Nickname: jebt-1_%four-digit random character string%_%four-digit random character string%

Server: reg.raxoper.**********
Port: 80
Nickname: jebt-1_%four-digit random character string%_%four-digit random character string%

– Furthermore it has the ability to perform actions such as:
• Download file
• Execute file

Backdoor Contact server:
The following:
• http://rc.rizalof.com/**********

As a result it may send some information. This is done via the HTTP GET request on a PHP script.

Sends information about:
• Current malware status

Injection – It injects itself into a process.

    Process name:
   • SVCHOST.EXE

   If successful, the malware process terminates while the injected part remains active.

Miscellaneous Mutex:
It creates the following Mutex:
• 3645FBCD-ECD2-23D0-BAC4-00DE453DEF6B

File details Programming language:
The malware program was written in MS Visual C++.

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
• UPX

See a brief description here.

Description inserted by Ionut Slaveanu on Thu, 14 Sep 2006 10:38 (GMT+1)
Description updated by Andrei Ivanes on Mon, 09 Oct 2006 11:18 (GMT+1)

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