Virus:TR/Hijack.Explor.1
Date discovered:28/06/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:45.056 Bytes
MD5 checksum:f508e5a83c339e32a4e0d1185873dea2
VDF version:6.35.00.88
IVDF version:6.35.00.99 - Friday, June 30, 2006

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Proxy.Win32.Small.ez
   •  TrendMicro: TROJ_SMALL.DEF
   •  F-Secure: Trojan-Proxy.Win32.Small.ez
   •  Grisoft: Proxy.FRE
   •  Eset: Win32/Agent.PA


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%\svcroot.exe

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "svcroot"="%SYSDIR%\scvroot.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "svcroot"="%SYSDIR%\svcroot.exe"



The following registry key is changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   Old value:
   • "Shell"="Explorer.exe"
   New value:
   • "Shell"="Explorer.exe svcroot.exe"

 Backdoor The following ports are opened:

– iexplore.exe on a random TCP port in order to provide a Socks 4 proxy server.
– iexplore.exe on TCP port 5050 in order to provide a remote Shell.


Contact server:
The following:
   • http://www.site.ru/socks/**********

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


Sends information about:
    • Computer name
    • CPU speed
    • Malware uptime
    • Opened port
    • Size of memory
    • Username
    • Information about the Windows operating system

 Injection – It injects itself into a process.

    Process name:
   • iexplore.exe

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

 Rootkit Technology Hides the following:
– Its own registry keys


Method used:
    • Hidden from Windows API

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

Description inserted by Adriana Popa on Wednesday, October 25, 2006
Description updated by Adriana Popa on Wednesday, October 25, 2006

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