TROJ_GAMETHI.SMO
PSW.OnlineGames3.AMIC (AVG); Trojan-GameThief.Win32.Magania.dfrd (Kaspersky); Trojan:Win32/Malagent (Microsoft); Win32/PSW.Gamania.NCV (NOD32)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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.
TECHNICAL DETAILS
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
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Restore this modified registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,{random five letters}.exe"
To: Userinit = %System%\userinit.exe,
- From: Userinit = "%System%\userinit.exe,{random five letters}.exe"
Step 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab\protected\AVP7\profiles\Updater
- enabled = "0"
- enabled = "0"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_GAMETHI.SMO. 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.
Step 6
Restore these deleted files from backup
*Note: Only Microsoft-related keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %System%\drivers\cdaudio.sys
- %System%\dllcache\cdaudio.sys
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_GAMETHI.SMO. 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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