PE_RECTIX.A-O

This file infector steals system information.

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

It infects by appending its code to target host files.

However, as of this writing, the said sites are inaccessible.

Arrival Details

This file infector 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 file infector drops the following files:

• %System%\d9dx.dll - copy of itself
• %System%\d3d8xof.dll - malicious component also detected as PE_RECTIX.A-O

(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.)

It injects itself into the following processes running in the affected system's memory:

• explorer.exe

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• ACPI#PNPDODO#1#Amd_DL5
• __DL_CORE5_MUTEX__
• __DL5XYEX__

Autostart Technique

This file infector adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CLASSES_ROOT\CLSID\{DA1910DE-AA86-4ED0-874B-2924E38BAD99}\
InprocServer32
(Default) = "%System%\d3d8xof.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{DA1910DE-AA86-4ED0-874B-2924E38BAD99}\InprocServer32
(Default) = "%System%\d3d8xof.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\ShellServiceObjectDelayLoad
DirectX = "{DA1910DE-AA86-4ED0-874B-2924E38BAD99}"

Other System Modifications

This file infector adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Google
CheckBKFlags = "{random value}"

File Infection

This file infector infects the following file types:

• .EXE

It infects by appending its code to target host files.

It searches for target files in the following drives:

• all available drives (physical, mapped, removable)

It avoids infecting folders containing the following strings:

• \QQ
• :\WINNT\
• :\WINDOWS\
• LOCAL SETTINGS\TEMP\

It avoids infecting the following files:

• asktao.exe
• au_unins_web.exe
• audition.exe
• autoupdate.exe
• ca.exe
• cabal.exe
• cabalmain.exe
• cabalmain9x.exe
• config.exe
• dbfsupdate.exe
• dk2.exe
• dragonraja.exe
• flyff.exe
• game.exe
• gc.exe
• hs.exe
• kartrider.exe
• main.exe
• maplestory.exe
• meteor.exe
• mhclient-connect.exe
• mjonline.exe
• mts.exe
• nbt-dragonraja2006.exe
• neuz.exe
• nmcosrv.exe
• nmservice.exe
• nsstarter.exe
• patcher.exe
• patchupdate.exe
• sealspeed.exe
• trojankiller.exe
• userpic.exe
• wb-service.exe
• woool.exe
• wooolcfg.exe
• xlqy2.exe
• xy2.exe
• xy2player.exe
• zfs.exe
• zhengtu.exe
• ztconfig.exe
• zuonline.exe

Other Details

This file infector connects to the following possibly malicious URL:

• http://fbindwebdlm.{BLOCKED}isdown.com/down/fbindweb.dlm

However, as of this writing, the said sites are inaccessible.

NOTES:
This file infector gets the version of Internet Explorer (IE) through SHDOCVW.DLL. It sends this information, along with other system information, to a certain site. Trend Micro detects infected files as PE_RECTIX.A.