BackDoor-DKA!456FB096

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

5378 (2008-09-05)

Updated DAT

5378 (2008-09-05)

Minimum Engine

5.3.00

File Length

17408

Description Added

2008-09-08

Description Modified

2008-09-08

Malware Proliferation

Characteristics

File Property	Property Value
FileName	680d008d.exe
McAfee Detection	BackDoor-DKA
Length	17,408 bytes
CRC	456FB096
MD5	4DA4A751224A80786747DB6D4D1F24B6
SHA1	F341FDBC6B50431BF21B7E3B4F4041CFB2BD3B8C

Other Common Detection Aliases

Company Name	Detection Name
ahnlab	Win-Trojan/Autorun.17461
avast	Win32:Virtualizer [Cryp]
AVG (GriSoft)	Downloader.Generic6.QDN
Avira	TR/Crypt.NSPM.Gen
BitDefender	GenPack:Generic.Malware.Bdldsp.D83C897C
Dr.Web	Trojan.Popwin
eSafe (Alladin)	suspicious Trojan/Worm [101]
Eset	Win32/TrojanDownloader.Flux
F-Prot	W32/Injector.D.gen!Eldorado
Kaspersky	Virus.Win32.AutoRun.xm
microsoft	trojan:win32/pepatch.e
norman	W32/DLoader.GGTH
rising	Packer.Win32.VmpPacker.a
Sophos	Mal/EncPk-AI
Symantec	Downloader
Trend Micro	BKDR_HUPIGON.EVG
vba32	Virus.Win32.AutoRun.xm
V-Buster	~Packed/NSPack

Avert® Labs has observed the following system activities:

Activity	Risk Level
Enumerates running processes	Medium
Program often suspends itself	Medium
Writes executable in the windows folder	Low
Performs a shell execute of downloaded or existing files	Informational

Other detections that have been observed.

FileName	McAfee Supported
%WINDIR%\system32\66905896.exe	BackDoor-DKA
%WINDIR%\system32\c2f62ca4.dll	BackDoor-DKA

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\66905896.exe

%WINDIR%\system32\c2f62ca4.dll

The following registry elements have been created:

hkey_users\.default\system\currentcontrolset\services\542a8dab\

description = c2f62ca4
displayname = 542a8dab
imagepath = c:\windows\system32\66905896.exe -k
objectname = localsystem

hkey_users\s-1-5-21-1202660629-602609370-839522115-500\system\currentcontrolset\services\542a8dab\

description = c2f62ca4
displayname = 542a8dab
imagepath = c:\windows\system32\66905896.exe -k
objectname = localsystem

The following registry elements have been changed:

hkey_local_machine\software\microsoft\pchealth\errorreporting\

doreport = 0
showui = 0

hkey_local_machine\software\microsoft\windows nt\

reportbootok = 1

hkey_local_machine\software\microsoft\windows\currentversion\explorer\advanced\folder\hidden\showall\

checkedvalue = 0

hkey_local_machine\system\controlset001\control\servicecurrent\

(default) = 9

hkey_local_machine\system\controlset001\services\tcpip\parameters\dnsregisteredadapters\{ddccd4fb-5c22-48ca-ba7f-3703d9881f9e}\

dnsserveraddresscount = 1
dnsserveraddresses = 55212
hostname = vmg-client
registeredaddresscount = 1
registeredaddresses = [binary data]
registeredflags = 0
registeredsinceboot = 0
registeredttl = 240
sentpriupdatetoip = 0
sentupdatetoip = 0

hkey_local_machine\system\currentcontrolset\enum\root\legacy_542a8dab\0000\control\

activeservice = 542a8dab

hkey_local_machine\system\currentcontrolset\services\542a8dab\

description = c2f62ca4
displayname = 542a8dab
errorcontrol = 1
imagepath = c:\windows\system32\66905896.exe -k
objectname = localsystem
start = 2
type = 16

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