TSPY_ONLING.KREA

This spyware monitors an infected user's browser for a list of Korean gaming sites and steals sensitive user login information.

To get a one-glance comprehensive view of the behavior of this Spyware, refer to the Threat Diagram shown below.

This spyware may be downloaded from remote sites by other malware.

It connects to certain websites to send and receive information.

Arrival Details

This spyware may be downloaded from remote site(s) by the following malware:

• TROJ_DLOAD.QYUA

It may be downloaded from the following remote sites:

• http://file.{BLOCKED}megirl.com/20120120.exe

Installation

This spyware drops the following files:

• %System%\d3dx9_09.dll - also detected as TSPY_ONLING.KREA

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Its DLL component is injected to the following process(es):

• iexplore.exe

Other Details

This spyware connects to the following website to send and receive information:

• {BLOCKED}d.{BLOCKED}p.com

NOTES:

Upon execution, it searches for the legitimate file, %System%\dllcache\imm32.dll. It copies the said DLL as follows:

• %User Profile%\Application Data\{random}.tmp
• %System%\{random}.tmp

It then patches imm32.dll's code to load its dropped component, d3dx9_09.dll, every time the legitimate DLL executes. The patched imm32.dll file is detected as PE_PATCHED.QYUA.

This spyware monitors the Internet Explorer (IE) activities of the affected system, specifically the address bar. It steals user credentials, such as user name and passwords, if a user visits online gaming sites with the following strings in the address bar:

• bm.ndoors.com
• booknlife.com
• eggmoney.kr
• hangame.com
• happyoz.com
• legendofblood.com
• mabinogi.com
• netmarble.net
• plaync.co.kr
• pmang.com
• webzen.co.kr
• www.nexon.com
• baram.nexon.com
• sword.nexon.com
• df.nexon.com
• http://dflogin.nexon.com/login/page/logout.aspxredirect=http://df.nexon.com/?GO=mber/login/al.login_mode=logou-on
• https://login.df.nexon.com/FRM/member/login/al.login_mode=logou-on

The stolen information is then sent to the C&C server, cmd.{BLOCKED}shop.com.

It checks and modifies the priveleges of the following processes if found running in memory:

• lsass.exe
• MalwareScanner.exe
• Virtlogonui.exe
• winlogon.exe
• V3Special.exe
• AyAgent.aye
• dumprep.exe
• ALYac.aye
• dwwin.exe
• irtservices.exe
• V3LTray.exe
• autoup.exe
• V3LRun.exe
• MUpdate2.exe
• SgSvc.exe
• NVCAgent.exe
• V3Light.exe
• vnSkyMon.exe
• V3LSvc.exe
• AYTask.exe
• V3Kill.exe
• AYServiceNT.aye
• SystemMon.exe