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Trojan.Win32.Downloader.61952.CU

Aliases  
Typical Symptoms  Attacks network,Decreases network speed,Changes registry,Security threats,Place malicious code,Downloading a particular file,Creates file
Discovered  [korea] 0000-00-00
 [Foreign] 0000-00-00
Type  Worm ActiveField  Win32
Destory/Distribution
Origin  others Encryption  NO
Location  Macro Memory residence  NO
Scan engine needed
2009-9-1 [Able to detect & repair]
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Description
 A. Route of Infection

        Trojan.Win32.Downloader.61952.CU is downloadded from hacked site or other malicious codes such as Spy/Adware, Dropper, and etc.

 

    B. Symptom of Infection

        1) Once Trojan.Win32.Downloader.61952.CU is executed, it terminates all monitoring tools like process, network, and registry by Anti-debugging function.

 

        2) Trojan.Win32.Downloader.61952.CU creates the following files.


            C:\win.com (Trojan.Win32.Downloader.61952.CU )
            C:\autorun.inf ( INF.S.Autorun.133 )
            (System Folder)\winrsc.exe (Copy itself)
            (System Folder)\drivers\sysdrv32.sys ( Trojan.Win32.RT-Agent.11656 )

 

        3) Trojan.Win32.Downloader.61952.CU adds registry like below.

 

            HKLM\SYSTEM\ControlSet001\Services\sysdrv32\ImagePath:

            "\??\C:\WINDOWS\system32\drivers\sysdrv32.sys

 

            HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows

            System Monitor: "C:\WINDOWS\system\winrsc.exe"

 

            HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_SYSDRV32\0000\Service: "sysdrv32"

 

        4) Trojan.Win32.Downloader.61952.CU's network runs like below.


 
[PIC 1] Send packets to same bandwidth continously

 

         5) Trojan.Win32.Downloader.61952.CU can be spread out via shared folder and USB by created autorun.inf.


 
[PIC 2] Autorun.inf

 

       


Removal Instructions

[How to repair]

Reparable by ViRobot engine ver.2009-09-01.00.
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