TROJ_DLOADER.ABUY

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 itself after execution.

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:

• %System Root%\DOCUME~1
• %System Root%\DOCUME~1\Wilbert
• %User Profile%\LOCALS~1
• %User Temp%\nsr3.tmp
• %Program Files%\moybkyzp

(Note: %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:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %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.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

This Trojan deletes the following files:

• %User Temp%\nsm1.tmp
• %User Temp%\nsr3.tmp
• {malware path and file name}.bat

(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 adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\moybkyzp

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\moybkyzp\Parameters

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\moybkyzp
ver = "20121003"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\moybkyzp\Parameters
ServiceDll = "%Program Files%\moybkyzp\moybkyzp.dll"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
netsvcs = "{random characters}"

(Note: The default value data of the said registry entry is {random values}.)

Dropping Routine

This Trojan drops the following files:

• %User Temp%\nsc2.tmp
• %User Temp%\nsr3.tmp\System.dll
• %User Temp%\nsr3.tmp\Math.dll
• %User Temp%\nsr3.tmp\nsCmds2.dll
• %Program Files%\moybkyzp\moybkyzp.dll
• %User Temp%\nsr3.tmp\nsCmds3.dll
• {malware path and file name}_del.bat

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other Details

This Trojan connects to the following possibly malicious URL:

• http://www.{BLOCKED}num.comcounter/mac_proc.php?{random characters}
• http://www.{BLOCKED}num.comcheck_counter.php?{random characters}

It deletes itself after execution.

This report is generated via an automated analysis system.