ThreatExpert Report: Worm.Win32.Cridex

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Submission Summary:

Submission details:

Submission received: 24 September 2012, 02:04:55
Processing time: 11 min 53 sec
Submitted sample:

File MD5: 0xBDC91D27FD9E946C8A3BAE77D7C982CE
File SHA-1: 0x03DDAB7A37EA571C006B6E26C5B42127EB308B52
Filesize: 398,336 bytes
Alias & packer info:

Worm.Win32.Cridex [Ikarus]
packed with: UPX [Kaspersky Lab]

Summary of the findings:

What's been found	Severity Level
Downloads/requests other files from Internet.
Modifies some system settings that may have negative impact on overall system security state.
Creates a startup registry entry.

Technical Details:

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File System Modifications

The following file was created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%AppData%\hLqkG6es.exe [file and pathname of the sample #1]	398,336 bytes	MD5: 0xBDC91D27FD9E946C8A3BAE77D7C982CE SHA-1: 0x03DDAB7A37EA571C006B6E26C5B42127EB308B52	Worm.Win32.Cridex [Ikarus] packed with UPX [Kaspersky Lab]

Note:

%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.

The following directories were created:

%AppData%\Macromedia
%AppData%\Macromedia\Flash Player
%AppData%\Macromedia\Flash Player\macromedia.com
%AppData%\Macromedia\Flash Player\macromedia.com\support
%AppData%\Macromedia\Flash Player\macromedia.com\support\flashplayer
%AppData%\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys
%AppData%\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\#ziehnnn.com
%AppData%\Roaming
%AppData%\Roaming\Macromedia
%AppData%\Roaming\Macromedia\Flash Player
%AppData%\Roaming\Macromedia\Flash Player\macromedia.com
%AppData%\Roaming\Macromedia\Flash Player\macromedia.com\support
%AppData%\Roaming\Macromedia\Flash Player\macromedia.com\support\flashplayer
%AppData%\Roaming\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys
%AppData%\Roaming\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\#ziehnnn.com

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
[filename of the sample #1]	[file and pathname of the sample #1]	495,616 bytes
hLqkG6es.exe	%AppData%\hlqkg6es.exe	495,616 bytes

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{1Eb4x09V-Ee0t-Xxqb-hPQT-yiUw4IsfTmPS}
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

The newly created Registry Values are:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{1Eb4x09V-Ee0t-Xxqb-hPQT-yiUw4IsfTmPS}]

d6rBg3Mi6o70HPo = ""%AppData%\hLqkG6es.exe" /ActiveX"

so that hLqkG6es.exe runs every time Windows starts

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

d6rBg3Mi6o70HPo = "%AppData%\hLqkG6es.exe"

so that hLqkG6es.exe runs every time Windows starts

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

NotifyDownloadComplete = "yes"

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0]

1400 = "0"

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1]

1400 = "0"

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3]

1400 = "0"

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

DisableTaskMgr = "1"
DisableRegistryTools = 0x00000001

to prevent users from starting Task Manager (Taskmgr.exe)

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

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

d6rBg3Mi6o70HPo = "%AppData%\hLqkG6es.exe"

so that hLqkG6es.exe runs every time Windows starts

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

Shell = "%AppData%\hLqkG6es.exe"

so that hLqkG6es.exe runs every time Windows starts

The following Registry Values were deleted:

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0]

1400 = 0x00000000

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1]

1400 = 0x00000000

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3]

1400 = 0x00000000

The following Registry Value was modified:

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

Shell =

Other details

To mark the presence in the system, the following Mutex object was created:

CritOpMutex

The following ports were open in the system:

Port	Protocol	Process
1034	TCP	[file and pathname of the sample #1]
1038	TCP	hLqkG6es.exe (%AppData%\hLqkG6es.exe)
1039	UDP	hLqkG6es.exe (%AppData%\hLqkG6es.exe)
1040	TCP	hLqkG6es.exe (%AppData%\hLqkG6es.exe)
1042	UDP	hLqkG6es.exe (%AppData%\hLqkG6es.exe)
1044	TCP	hlqkg6es.exe (%AppData%\hlqkg6es.exe)
1049	UDP	[file and pathname of the sample #1]
1050	UDP	hlqkg6es.exe (%AppData%\hlqkg6es.exe)

The following Internet Connection was established:

Server Name	Server Port	Connect as User	Connection Password
ziehnnn.com	80	(null)	(null)

The following GET request was made:

partner7/redirector/redirector.php

The data identified by the following URL was then requested from the remote web server:

http://ziehnnn.com/partner7/universalpanel/kokes.php?hwid=4281525696&pc=COMPUTERNAME&localip=127.0.0.1&winver=Windows XP Professional x32

The following Internet downloads were started (the retrieved bits are saved into the local file):

URL to be downloaded	Filename for the downloaded bits
http://ziehnnn.com/sol/ziehnnncom/mainsettings/settings.sol	%AppData%\Roaming\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\settings.sol
http://ziehnnn.com/sol/ziehnnncom/domainsettings/settings.sol	%AppData%\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\#ziehnnn.com\settings.sol
http://ziehnnn.com/sol/ziehnnncom/mainsettings/settings.sol	%AppData%\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\settings.sol
http://ziehnnn.com/sol/ziehnnncom/domainsettings/settings.sol	%AppData%\Roaming\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\#ziehnnn.com\settings.sol

There were application-defined hook procedures installed into the hook chain (e.g. to monitor keystrokes). The installed hooks are handled by the following modules:

%AppData%\hLqkG6es.exe
[file and pathname of the sample #1]

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