Virus:TR/Proxy.Horst.IE.1
Date discovered:12/09/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:47.104 Bytes
MD5 checksum:00095f53d9341548d265aae915e9dac6
VDF version:6.35.01.215
IVDF version:6.35.01.219 - Wednesday, September 13, 2006

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Mcafee: BackDoor-CMQ
   •  Kaspersky: Trojan-Proxy.Win32.Horst.jf
   •  TrendMicro: WORM_MEDBOT.AI
   •  F-Secure: Trojan-Proxy.Win32.Horst.jf
   •  Grisoft: Proxy.FRG
   •  Eset: Win32/Medbot.BJ


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


Side effects:
   • Registry modification
   • Steals information
   • 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: jebw-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/**********

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


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

Description inserted by Adriana Popa on Monday, October 30, 2006
Description updated by Adriana Popa on Monday, October 30, 2006

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