TROJ_GAMETHI.SMO

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It steals sensitive information such as user names and passwords related to certain games.

It creates an event.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system:

• %System%\{random five letters}.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It injects itself into the following processes as part of its memory residency routine:

• explorer.exe
• Iexplore.exe

Autostart Technique

This Trojan modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe,{random five letters}.exe"

(Note: The default value data of the said registry entry is %System%\userinit.exe,.)

Process Termination

This Trojan terminates the following processes if found running in the affected system's memory:

• ALUSCHEDULERSVC.EXE
• ASHDISP.EXE
• avast.setup
• AVGNT.EXE
• AVGRSX.EXE
• avgupd.exe
• avgupd.exe
• AVP.EXE
• AYAGENT.AYE
• AYUpdate.aye
• BDAGENT.EXE
• CCSVCHST.EXE
• eguiEmon.dll
• eguiEpfw.dll
• EKRN.EXE
• ekrnEmon.dll
• ekrnEpfw.dll
• LIVESRV.EXE
• luall.exe
• mcupdate.exe
• preupd.exe
• prupdate.ppl
• setup.ovr
• SfFnUp.exe
• UFSEAGNT.EXE
• UfUpdUi.exe
• Update.exe
• updater.dll
• VCRMON.EXE
• VSTSKMGR.EXE
• vsupdate.dll

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

• http://{BLOCKED}na.com/images/china.gif
• http://{BLOCKED}na.com/images/china.jpg
• http://{BLOCKED}na.com/images/china.bmp

Information Theft

This Trojan steals sensitive information such as user names and passwords related to the following games:

• MapleStory
• Arad Senki
• Ragnarok Online
• World of Warcraft
• Gersang
• Blue Sky
• Twelve Sky
• Red Stone
• Dungeon Fighter
• Play Online
• Gamania
• AION GameClient
• Xtreme Jade
• Neowiz Games

Other Details

This Trojan creates the following event(s):

• MN_XADLEBCBAXCSDFGEWQCDDD0
• DWONS_ASMAPING_XADADAKEUPOIUY98753M

NOTES:

This Trojan checks the language of the system by querying the following registry entry:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\Language
InstallLanguage = "{number}"

If the number above is equivalent to 0804, this means that the language is in Chinese. It does not continue its routines.

It searches for the following files on the affected system:

• %System%\drivers\cdaudio.sys
• %System%\dllcache\cdaudio.sys

If found, the files are modified and executed as a service with service name AVPsys. This is used as part of its memory residency.

It also disables a particular antivirus from updating itself by creating the following registry entry:

HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab\protected\AVP7\profiles\Updater
enabled = "0"

It obtains user account details from the aforementioned games by monitoring the following processes:

• _beanfuncore.exe
• aclient.exe
• aion.bin
• arad.exe
• blueskyclient_r.exe
• changchun.exe
• client.exe
• dnf.exe
• elementclient.exe
• engine.exe
• gersang.exe
• InphaseNXD.exe
• l2.bin
• maplestory.exe
• msnmsgr.exe
• online.dat
• pcotp.exe
• pol.exe
• ragexe.exe
• ragfree.exe
• ragurdrexe.exe
• Red Stone.exe
• twelvesky2.exe
• wow.exe
• yahoomessenger.exe

It also monitors the Internet Explorer (IE) activities of the affected system, specifically the address bar, if a user visits sites:

• http://12sky2.paran.com
• http://aion.plaync.co.kr
• http://dbo.netmarble.net
• http://df.nexon.com/?go=home|intro
• http://dragonnest.nexon.com
• http://game4.netmarble.net/prius/main.asp
• http://id.hangame.com
• http://itemmall.gersang.co.kr\
• http://login.live.com
• http://login.nexon.com/login
• http://maplestory.nexon.com
• http://r2.hangame.com
• http://raycity.pmang.com
• http://sp1.nexon.com
• http://tw.beanfun.com
• http://tw.beanfun.gamania.com
• http://tw.yahoo.com
• http://www.gersang.co.kr\
• http://www.hangame.com
• http://www.nexon.com
• http://www.pmang.com
• http://yulgang.mgame.com
• https://login.plaync.co.kr
• https://login.yahoo.com
• https://tw.beanfun.gamania.com
• https://tw.beanfun.gamania.com/unlock_login
• https://tw.gash.gamania.com/gashlogin.aspx
• https://tw.gash.gamania.com/updatemainaccountpassword.aspx
• https://tw.gash.gamania.com/updateserviceaccountpassword.aspx?servicecode=600035
• https://tw.gash.gamania.com/updateserviceaccountpassword.aspx?servicecode=610074
• https://tw.login.beanfun.com
• https://www.worldofwarcraft.com/login/login