TROJ_STARTP.SMHU

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 deletes the initially executed copy of itself.

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 creates the following folders:

• %Program Files%\Microsoft11
• %Program Files%\Microsoft11\Internet Explorar
• %System Root%\DOCUME~1
• %System Root%\DOCUME~1\ADMINI~1
• %User Profile%\LOCALS~1
• %User Temp%\nss3.tmp
• %System Root%\Documents and Settings
• %System Root%\Documents and Settings\All Users

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other System Modifications

This Trojan deletes the following files:

• %User Temp%\nsz1.tmp
• %User Temp%\nss3.tmp

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It deletes the following folders:

• %User Temp%\nss3.tmp\

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It adds the following registry keys:

HKEY_CLASSES_ROOT\.of

HKEY_CLASSES_ROOT\offile\DefaultIcon

HKEY_CLASSES_ROOT\offile\shell\
open\command

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
CLSID\{871C5380-42A0-1069-A2EA-08002B30309D}\ShellFolder
Attributes = 133ec2

(Note: The default value data of the said registry entry is 0.)

Dropping Routine

This Trojan drops the following files:

• %User Temp%\nsz2.tmp
• %Program Files%\Microsoft11\Internet Explorar\target.lnk
• %User Temp%\nss3.tmp\AccessControl.dll
• %Desktop%\Internet Explorar.of
• %Windows%\tbgw.ico
• %Desktop%\ÌÔ ±¦ Íø ¹º.lnk

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.)

Other Details

This Trojan deletes the initially executed copy of itself

This report is generated via an automated analysis system.