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Dropper.S.Downloader.233984

Aliases
Typical Symptoms	Changes registry,,Installing Trojan Horse,Creates file
Discovered	[korea] 0000-00-00 [Foreign] 0000-00-00
Type	Trojan Horse	ActiveField	Win32
Destory/Distribution
Origin	others	Encryption	NO
Location	File	Memory residence	NO
Scan engine needed	2010-07-23 [Able to detect & repair]

[Symptom of Infection]

1. It is a malicious code that is related to me2DAY online service, and it spreads out with other applications such as Internet TV program.

2. It spreads out by me2DAY and twitter services.

http://twitter.com/adrxxxxxx_82

http://me2day.net/adrxxxxxx_82

[PIC 1] me2DAY

[PIC 2] Twitter

3. It downloads malicious codes from below sites.

http://11x.1xx.15x.x47/upload/atk.exe

http://11x.1xx.15x.x47/upload/fm.exe

http://11x.1xx.15x.x47/upload/prvupdtcln.exe

4. The malicious code creates csupdt.dll file to system folder, and the file pretends to be a Microsoft Windows Update file.

5. The csupdt.dll is injected to svchost process, and it downloads malicious codes by period.

6. It is registered to below services.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinNetMng]

"Type"=dword:00000010

"Start"=dword:00000002

"ErrorControl"=dword:00000001

"ImagePath"=hex(2):43,00,3a,00,5c,00,57,00,49,00,4e,00,44,00,4f,00,57,00,53,00,\

5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,76,00,63,\

00,68,00,6f,00,73,00,74,00,20,00,2d,00,6b,00,20,00,63,00,73,00,00,00

"DisplayName"="Windows Net Manager"

"ObjectName"="LocalSystem"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinNetMng\Parameters]

"ServiceDll"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,\

00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,\

63,00,73,00,75,00,70,00,64,00,74,00,2e,00,64,00,6c,00,6c,00,00,00

7. The detection names which are related to me2DAY are like below:

Trojan.Win32.Malex.184320

Trojan.Win32.S.Agent.100864

Trojan.Win32.S.Agent.101376

Trojan.Win32.S.Agent.494080

Worm.Win32.P2P-Palevo.D.Gen

[How to repair]

1. If you are WinXP/ME users, please be inactivate System Recovery Function.

The reason why being inactivate of the system recovery is to clean the virus completely.
You can refer to MS technical documents(Q263455) for more details.

2. Update the engine module for the latest one.
To repair this virus, you need to update the engine for the latest one.

a. ViRobot products users
-Download the latest engine files via our website (www.hauri.net)

b. Non-ViRobot products users
- Use the LiveCall (Free Scan) via the website (http://www.livecall.co.kr)

- Use the trial version of ViRobot products (30days only)

3. How to scan the virus.

a. Run your ViRobot, and choose "all files" in scan option.

- ViRobot Desktop 5.0 : [Tools] -> [Configuration] -> [Virus Scan] : Check all files

- ViRobot Desktop 5.5 : [Tools] -> [Configuration] -> [Virus Scan] : Check all files

- LiveCall (Free Scan) : [Advanced Scan] : Check

b. Repair all viruses detected.

c. If [Auto-repair after rebooting] message shows up, please try to re-scan after rebooting the PC.

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