Analysis by: rolandde
ALIASES:

Trojan/Win32.OnlineGameHack (AhnLab-V3)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size: 89,088 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 26 Jan 2012

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

  SOLUTION

Minimum Scan Engine: 9.200
VSAPI OPR PATTERN File: 8.741.00
VSAPI OPR PATTERN Date: 29 Jan 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by TSPY_ONLING.KREA

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %User Profile%\Application Data\{random}.tmp
  • %System%\{random}.tmp

Step 5

Scan your computer with your Trend Micro product to delete files detected as TSPY_ONLING.KREA. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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