TR/Proxy.Horst.HT - Trojan

See also

Summary

Full description

Statistics

Virus:	TR/Proxy.Horst.HT
Date discovered:	05/09/2006
Type:	Trojan
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	43.520 Bytes
MD5 checksum:	676a335f3aa5635a304b3411490c4c86
VDF version:	6.35.01.182 - Tue, 05 Sep 2006 11:32 (GMT+1)
IVDF version:	6.35.01.186 - Wed, 06 Sep 2006 09:30 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Kaspersky: Trojan-Proxy.Win32.Horst.hz
   • TrendMicro: WORM_MEDBOT.AI
   • F-Secure: Trojan-Proxy.Win32.Horst.hz
   • Grisoft: Proxy.FEV

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

Side effects:
   • Drops a malicious file
   • Registry modification
   • Third party control

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

The following file is created:

– %SYSDIR%\nvsvcd.exe Further investigation pointed out that this file is malware, too.

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

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • ".nvsvc"="%SYSDIR%\smss.exe /w"

The following registry keys are added in order to load the services 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"

– [HKLM\SYSTEM\CurrentControlSet\Services\Windows Log\Security]
   • "Security"=%hex values%

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: reg.raxoper.**********
Port: 80
Nickname: jebu-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:
• rc.rizalof.com/**********

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.

File details 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 Adriana Popa on Tue, 03 Oct 2006 16:07 (GMT+1)
Description updated by Adriana Popa on Tue, 03 Oct 2006 16:12 (GMT+1)

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