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Thursday, July 3, 2008
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Tibia: Part Two Posted by Response @ 18:06 GMT

Tibia is a massively multiplayer online role-playing game (MMORPG). See part one of this post for more details.

Open Tibia players use "IP Changer" applications to reconfigure their Tibia clients.

We recently analyzed a sample which included one such IP Changer. It's detected as Trojan-Dropper.W32/Agent.EUJ.

Agent.EUJ has a file size of 728,637 bytes and is packed with FSG 2.0. When the file is executed it runs this IP Changer:

IPChanger

It also installs a Trojan-Spy on the player's computer.

BlackLight reveals FQHG.exe hidden in the process list.

Blacklight FQHG

So this is what happens when Agent.EUJ is executed…

It drops and executes:


C:\WIN.EXE – detected as Trojan-Dropper.Win32.Small.awz
C:\SHYNZO IPCHANGER.EXE – which is a non-malicious IP Changer

Small.awz is compiled in Microsoft Visual C++ 6.0 with a file size of 492,166 bytes. It creates the following files:

%temp%\@{random hex numbers}.tmp – a library file detected as Monitor.Win32.Ardamax.o
%temp%\@{random hex numbers}.tmp – a non-executable file which has embedded malicious executable files

Small.awz then loads the library file and executes its exported function "sfx_main". This library file extracts the embedded malicious executable files in the non-executable file "%temp%\@{random hex numbers}.tmp" and drops it to the folder %windir%\Sys32.

%windir%\Sys32\FQGH.006 – detected as Trojan-Spy:W32/Ardamax.N
%windir%\Sys32\FQGH.007 – detected as Monitor.Win32.Ardamax.o
%windir%\Sys32\FQGH.exe – detected as Trojan-Spy.Win32.Ardamax.r
%windir%\Sys32\AKV.exe – detected as Trojan-Spy.Win32.Ardamax.gz

Lastly, it executes Trojan-Spy.Win32.Ardamax.r.

Ardamax.r is used by the files FQGH.006, FQGH.007 and AKV.exe as a component for hiding its process, to monitor processes, and to take snapshots of the system.

It creates the following Registry entry as its Autorun:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
FQHG Agent = "%windir%\Sys32\FQHG.exe"

It then sends the snapshots and monitored processes via e-mail to "Ardamax Keylogger" <[REMOVED]@itelefonica.com.br>.

E-mail message:

Agent.EUJ

E-mail message:

Agent.EUJ

Monitor logs:

Agent.EUJ

Online game passwords are frequently targeted for a variety of reasons.

Hacked accounts are a common support issue. Check out option number four from Tibia's Lost Acconts page…

Tibia Lost Account

Response Team post by Lordian & Sean





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