ThreatExpert Report: Mal/Behav-010, Worm:Win32/Cridex.E, Worm.Win32.Cridex

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Submission Summary:

Submission details:

Submission received: 18 September 2012, 05:41:22
Processing time: 12 min 33 sec
Submitted sample:

File MD5: 0x9FD2D0A575D63B52D75E7F582D508265
File SHA-1: 0xE6542BE3822FD8A14C1AA042EC85EF0EBCFF3D2E
Filesize: 135,168 bytes
Alias:

Mal/Behav-010 [Sophos]
Worm:Win32/Cridex.E [Microsoft]
Worm.Win32.Cridex [Ikarus]

Summary of the findings:

What's been found	Severity Level
Creates a startup registry entry.

Technical Details:

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%AppData%\KB00121600.exe	135,168 bytes	MD5: 0x9FD2D0A575D63B52D75E7F582D508265 SHA-1: 0xE6542BE3822FD8A14C1AA042EC85EF0EBCFF3D2E	Mal/Behav-010 [Sophos] Worm:Win32/Cridex.E [Microsoft] Worm.Win32.Cridex [Ikarus]
2	%Temp%\exp1.tmp	0 bytes	MD5: 0xD41D8CD98F00B204E9800998ECF8427E SHA-1: 0xDA39A3EE5E6B4B0D3255BFEF95601890AFD80709	(not available)

Notes:

%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.
%Temp% is a variable that refers to the temporary folder in the short path form. By default, this is C:\Documents and Settings\[UserName]\Local Settings\Temp\ (Windows NT/2000/XP).

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
[generic host process]	[generic host process filename]	45,056 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	135,168 bytes
kb00121600.exe	%AppData%\kb00121600.exe	135,168 bytes

Notes:

[generic host process filename] is a full path filename of [generic host process].

Registry Modifications

The newly created Registry Value is:

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

KB00121600.exe = ""%AppData%\KB00121600.exe""

so that KB00121600.exe runs every time Windows starts

Other details

To mark the presence in the system, the following Mutex objects were created:

Iexplore.XPExceptionFilter
DesktopCleanupMutex
Local\XMM0000009C
Local\XMI0000009C
Local\XMM000006A8
Local\XMI000006A8
Local\XMM000000D0
Local\XMI000000D0

The following Host Name was requested from a host database:

192.5.5.241

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