TROJ_MONDER.RON

Trend Micro has flagged this Trojan as noteworthy due to the increased potential for damage, propagation, or both, that it possesses. Specifically, it uses search engine optimization (SEO) poisoning techniques that may lure the customers to unknowingly download a rogue Adobe Flash Player application which is the malware itself.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers.

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting the following malicious websites:

• http://{BLOCKED}win.co.cc/

Installation

This Trojan is injected into the following processes running in memory:

• firefox.exe
• maxthon.exe
• mozilla.exe
• opera.exe
• safari.exe

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
JDK55WFMZY = %User Temp%\cdx.exe

It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SSHNAS
(Default) =

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\JDK55WFMZY
(Default) =

HKEY_CURRENT_USER\Software\W34BCG2GRJ
(Default) =

HKEY_CURRENT_USER\SOFTWARE\XML
(Default) =

Dropping Routine

This Trojan drops the following files:

• %System%\sshnas21.dll - detected as TROJ_MONDER.RON
• %Windows%\cwohia.exe - detected as TROJ_MONDER.RON

(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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

• http://{BLOCKED}.{BLOCKED}.64.105/perce/{random numbers}/{random numbers}/qwerce.gif - saved as %User Temp%/cdx.exe
• http://{BLOCKED}.{BLOCKED}.44.73/logos/{random numbers}/{random numbers}/logo.gif - saved as %User Temp%/cdv.exe
• http://{BLOCKED}.{BLOCKED}.35.3/werber/{random numbers}/517.gif - saved as %User Temp%/cdw.exe

Trend Micro detects the dowloaded file as:

• TROJ_MONDER.RON

Other Details

Based on analysis of the codes, it has the following capabilities:

• Creates scheduled tasks to execute files:
  • {35DC3473-A719-4d14-B7C1-FD326CA84A0C}.job - executes %Windows%\cwohia.exe
  • {8C3FDD81-7AE0-4605-A46A-2488B179F2A3}.job - executes %User Temp%\cdx.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It connects to the following possibly malicious URL:

• http://srv.{BLOCKED}ia.com/pre/getAds.php?{random}

Rogue Antivirus Routine

This Trojan displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers.