Generic Dropper!190AA1AB

Overview

This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Minimum DAT

5343 (2008-07-21)

Updated DAT

5343 (2008-07-21)

Minimum Engine

5.2.00

File Length

43537

Description Added

2008-07-22

Description Modified

2008-07-22

Malware Proliferation

Characteristics

File Property	Property Value
File Name	626247~1.exe
McAfee Detection	Generic Dropper
Length	43,537 bytes
CRC32	190AA1AB
MD5	c4d8530357166cb2c6fb10faa837b44b
SHA1	AF2B42C89714ECDDC3E253AC2309D401EA20884B

Other Common Detection Aliases

Company Name	Detection Name
Avast	Win32:LdPinch-CTD [Trj]
AVG (GriSoft)	Dropper.Agent.IAC
Avira	DR/MicroJoiner.Gen
BitDefender	Trojan.Dropper.LdPinch.AH
ClamAV	Trojan.Dropper-6679
Dr.Web	Trojan.MulDrop.15079
FortiNet	W32/DROPPER.IAC!tr
F-Prot	W32/Agent.BJ.gen!Eldorado
Kaspersky	Trojan-Spy.Win32.Webmoner.jt
Microsoft	trojandropper:win32/small.ajs
Sophos	Mal/Generic-A
Symantec	Infostealer
Vba32	Trojan-Spy.Win32.Zbot.vb

Avert® Labs has observed the following system activities:

Activity	Risk Level
Modifies Memory of Other Processes	High
Enumerates running Processes	Medium
Creates Registry Keys and Data values persistent on OS Reboot	Low
Enumerates open windows	Low
Writes Executable in the Windows Folder	Low
Program often suspends itself	Informational

System Changes

These are general defaults for typical path variables. (Although they may differ, these examples are common.):
%WinDir% = \WINDOWS (Windows 9x/ME/XP/Vista), \WINNT (Windows NT/2000)
%SystemDir% = \WINDOWS\SYSTEM (Windows 98/ME), \WINDOWS\SYSTEM32 (Windows XP/Vista), \WINNT\SYSTEM32 (Windows NT/2000)
%ProgramFiles% = \Program Files

The following files have been added to the system:

%WINDIR%\system32\ntos.exe

%WINDIR%\system32\wsnpoem

%WINDIR%\system32\wsnpoem\audio.dll

%WINDIR%\system32\wsnpoem\video.dll

The following registry elements have been changed:

HKEY_LOCAL_MACHINE\software\microsoft\windows nt\currentversion\network\

uid = vmg-client_003558eb

HKEY_LOCAL_MACHINE\software\microsoft\windows nt\currentversion\winlogon\

userinit = c:\windows\system32\userinit.exe,c:\windows\system32
\ntos.exe,

hkey_users\.default\software\microsoft\windows\currentversion\explorer\

{f710fa10-2031-3106-8872-93a2b5c5c620} = 115591

hkey_users\.default\software\microsoft\windows\currentversion\run\

userinit = c:\windows\system32\ntos.exe

hkey_users\s-1-5-19\software\microsoft\windows nt\currentversion\network\

uid = vmg-client_00356ce1

hkey_users\s-1-5-20\software\microsoft\windows nt\currentversion\network\

uid = vmg-client_00356cc2

The applications created the following network connection(s):

zelog.x10hosting.com port (80) Protocol (http)

hxxp://zelog.x10hosting.com /***********

Symptoms

This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

Method of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.

Removal

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

2.Update to current engine and DAT files for detection and removal.

3.Run a complete system scan.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

1. Please go to the Microsoft Recovery Console and restore a clean MBR.

On windows XP:

Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.

On Windows Vista and 7:

Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.

Threat Detail