ThreatExpert Report: Trojan-Dropper.Win32.Autoit.k, Email-Worm.Win32.Agent.kd, W32.SillyFDC..

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Submission Summary:

Submission details:

Submission received: 14 March 2009, 17:20:12
Processing time: 7 min 38 sec
Submitted sample:

File MD5: 0x2D7A145DB1637052C6644D0B35E0B2F9
File SHA-1: 0x2F9D83945DED8BE046D3917BCD006795AA0FCB56
Filesize: 506,880 bytes
Alias & packer info:

W32.SillyFDC [Symantec]
Trojan-Dropper.Win32.Autoit.k, Email-Worm.Win32.Agent.kd [Kaspersky Lab]
Generic.dx [McAfee]
W32/Autoit-BP [Sophos]
packed with: PE_Patch.PECompact [Kaspersky Lab]

Summary of the findings:

What's been found	Severity Level
Modifies some system settings that may have negative impact on overall system security state.
Creates a startup registry entry.
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

Attention! The following threat category was identified:

Threat Category	Description
	A malicious trojan horse or bot that may represent security risk for the compromised system and/or its network environment

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%AllUsersProfile%\All Users.exe %CommonDesktopDir%\Desktop.exe %AllUsersProfile%\Desktop.exe %CommonFavorites%\Favorites.exe %AllUsersProfile%\Favorites.exe %Profiles%\All Users.exe %Profiles%\Documents and Settings.exe %DesktopDir%\Desktop.exe %UserProfile%\Desktop.exe %AppData%\Microsoft\CD Burning\KHATRA.exe %AppData%\Microsoft\CD Burning\New Folder(3).exe %AppData%\Microsoft\CD Burning\%UserName%.exe %UserProfile%\%UserName%.exe %Profiles%\%UserName%.exe c:\Documents and Settings.exe c:\Inetpub\Inetpub.exe c:\Inetpub.exe c:\KHATRA.exe %Windir%\KHATARNAKH.exe %Windir%\system\gHost.exe %System%\KHATRA.exe [file and pathname of the sample #1] %Windir%\Xplorer.exe	506,880 bytes	MD5: 0x2D7A145DB1637052C6644D0B35E0B2F9 SHA-1: 0x2F9D83945DED8BE046D3917BCD006795AA0FCB56	W32.SillyFDC [Symantec] Trojan-Dropper.Win32.Autoit.k, Email-Worm.Win32.Agent.kd [Kaspersky Lab] Generic.dx [McAfee] W32/Autoit-BP [Sophos] packed with PE_Patch.PECompact [Kaspersky Lab]
2	%CommonPrograms%\Startup\(Empty).LNK	1,259 bytes	MD5: 0xAA5BF1CA69FE390C56A405CCD4F72545 SHA-1: 0xB6CAD67404B202B078A14AC5321699E324E0E6A3	(not available)
3	%AppData%\Microsoft\CD Burning\AUTORUN.inF %Windir%\inf\Autoplay.inF	234 bytes	MD5: 0x7AE2F1A7CE729D91ACFEF43516E5A84C SHA-1: 0xEBBC99C7E5AC5679DE2881813257576EC980FB44	Trojan-Downloader.JS.Agent.dpk [Kaspersky Lab] W32/Autoit-BP [Sophos]
4	%Windir%\K.Backup\C_Drive_Documents and Settings_All Users_Start Menu_Programs_Startup_desktop.ini.FUCKED %Windir%\K.Backup\C_Drive_Documents and Settings_%UserName%_Start Menu_Programs_Startup_desktop.ini.FUCKED	84 bytes	MD5: 0xD6A6856702E3F0953E7246A9B4A9FE35 SHA-1: 0x95E17541FB7200ACFEA240430EC01778FE9BF2FE	(not available)
5	%Windir%\Tasks\At1.job	346 bytes	MD5: 0xAB976E7509038B3F2B7D3CD18E4EA609 SHA-1: 0xB9BEAE6CED2A20627DB556676AB965EF51851381	(not available)

Notes:

%AllUsersProfile% is a variable that specifies the all users' profile folder. By default, this is C:\Documents and Settings\All Users (Windows NT/2000/XP).
%CommonDesktopDir% is a variable that refers to the file system directory that contains files and folders that appear on the desktop for all users. A typical path is C:\Documents and Settings\All Users\Desktop (Windows NT/2000/XP).
%CommonFavorites% is a variable that refers to the file system directory that serves as a common repository for all users' favorite items. A typical path is C:\Documents and Settings\All Users\Favorites (Windows NT/2000/XP).
%Profiles% is a variable that refers to the file system directory containing user profile folders. A typical path is C:\Documents and Settings.
%DesktopDir% is a variable that refers to the file system directory used to physically store file objects on the desktop. A typical path is C:\Documents and Settings\[UserName]\Desktop.
%UserProfile% is a variable that specifies the current user's profile folder. By default, this is C:\Documents and Settings\[UserName] (Windows NT/2000/XP).
%AppData% is a variable that refers to the file system directory that serves as a common repository for application-specific data. A typical path is C:\Documents and Settings\[UserName]\Application Data.
%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
%System% is a variable that refers to the System folder. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
%CommonPrograms% is a variable that refers to the file system directory that contains the directories for the common program groups that appear on the Start menu for all users. A typical path is C:\Documents and Settings\All Users\Start Menu\Programs (Windows NT/2000/XP).

The following files were deleted:

%CommonPrograms%\Startup\desktop.ini
%Programs%\Startup\desktop.ini

Notes:

%Programs% is a variable that refers to the file system directory that contains the user's program groups. A typical path is C:\Documents and Settings\[UserName]\Start Menu\Programs.

The following directory was created:

%Windir%\K.Backup

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
KHATRA.exe	%System%\khatra.exe	745,472 bytes
Xplorer.exe	%Windir%\xplorer.exe	745,472 bytes
gHost.exe	%Windir%\system\ghost.exe	745,472 bytes
khatarnakh.exe	%Windir%\khatarnakh.exe	745,472 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	745,472 bytes

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
HKEY_LOCAL_MACHINE\SOFTWARE\KHATRA
HKEY_LOCAL_MACHINE\SOFTWARE\KHATRA\Startup_List
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
HKEY_CURRENT_USER\Software\Nico Mak Computing
HKEY_CURRENT_USER\Software\Nico Mak Computing\WinZip
HKEY_CURRENT_USER\Software\Nico Mak Computing\WinZip\caution

The newly created Registry Values are:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run]

G_Host = ""%Windir%\System\gHost.exe" /Reproduce"

so that gHost.exe runs every time Windows starts

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]

Xplorer = ""%Windir%\Xplorer.exe" /Windows"

so that Xplorer.exe runs every time Windows starts

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]

Taskman = "%System%\KHATRA.exe"

so that KHATRA.exe runs every time Windows starts

[HKEY_LOCAL_MACHINE\SOFTWARE\KHATRA\Startup_List]

VMware Tools = "%ProgramFiles%\VMware\VMware Tools\VMwareTray.exe"
VMware User Process = "%ProgramFiles%\VMware\VMware Tools\VMwareUser.exe"
Xplorer = ""%Windir%\Xplorer.exe" /Windows"
MSMSGS = ""%ProgramFiles%\Messenger\msmsgs.exe" /background"

[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]

Window Title = "Internet Exploiter"

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]

NoControlPanel = 0x00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]

DisableRegistryTools = 0x00000001

to disable the Windows registry editors (Regedt32.exe and Regedit.exe)

[HKEY_CURRENT_USER\Software\Nico Mak Computing\WinZip\caution]

NoUnsafeTypeCautionForSCR = "1"
NoUnsafeTypeCautionForEXE = "1"

The following Registry Values were modified:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL]

CheckedValue = 0x00000000

so that hidden files and folders are not displayed in explorer when browsing the file system

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]

VMware Tools = "%Windir%\Xplorer.exe"
VMware User Process = "%System%\KHATRA.exe"

so that Xplorer.exe runs every time Windows starts

so that KHATRA.exe runs every time Windows starts

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]

NoDriveTypeAutoRun = 0x000000FF

[HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows]

load = "%System%\KHATRA.exe"

so that KHATRA.exe runs every time Windows starts

Other details

Analysis of the file resources indicate the following possible country of origin:

United Kingdom

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