Submission Summary:

• Submission details:
• Submission received: 11 September 2012, 18:13:27
• Processing time: 8 min 33 sec
• Submitted sample:
• File MD5: 0x4F4EF3D0CF6E1D8563A8FCBD619CF2AF
• File SHA-1: 0x65F11C0500BF0F9D15A63D03E03E1E7E94D25DB4
• Filesize: 125,309 bytes
• Alias:
• Trojan.Gen [Symantec]
• Trojan.Win32.Refroso.dwsi [Kaspersky Lab]
• BackDoor-CEP.cm!a [McAfee]
• VirTool:Win32/Injector.BP [Microsoft]
• Trojan.Win32.Refroso [Ikarus]

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	%System%\Bifrost\logg.dat	0 bytes	MD5: 0xD41D8CD98F00B204E9800998ECF8427E SHA-1: 0xDA39A3EE5E6B4B0D3255BFEF95601890AFD80709	(not available)
2	%System%\Bifrost\server.exe [file and pathname of the sample #1]	125,309 bytes	MD5: 0x4F4EF3D0CF6E1D8563A8FCBD619CF2AF SHA-1: 0x65F11C0500BF0F9D15A63D03E03E1E7E94D25DB4	Trojan.Gen [Symantec] Trojan.Win32.Refroso.dwsi [Kaspersky Lab] BackDoor-CEP.cm!a [McAfee] VirTool:Win32/Injector.BP [Microsoft] Trojan.Win32.Refroso [Ikarus]

• Note:
• %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).

• The following directory was created:
• %System%\Bifrost

Memory Modifications

• There were new processes created in the system:

Process Name	Process Filename	Main Module Size
server.exe	%System%\Bifrost\server.exe	286,720 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	286,720 bytes

Registry Modifications

• The following Registry Keys were created:
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{9D71D88C-C598-4935-C5D1-43AA4DB90836}
• HKEY_LOCAL_MACHINE\SOFTWARE\Bifrost
• HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\MediaResources\msvideo
• HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources\msvideo
• HKEY_CURRENT_USER\Software\Bifrost

• The newly created Registry Values are:
• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{9D71D88C-C598-4935-C5D1-43AA4DB90836}]
• stubpath = "%System%\Bifrost\server.exe s"

so that server.exe runs every time Windows starts

• [HKEY_LOCAL_MACHINE\SOFTWARE\Bifrost]
• nck = ED 1B E6 27 B9 28 D6 32 74 C3 CD 74 FA 93 5B 67
• [HKEY_CURRENT_USER\Software\Bifrost]
• klg = 01

Other details

• To mark the presence in the system, the following Mutex object was created:
• Bif1234

• The following Host Name was requested from a host database:
• 192.5.5.241

• There was registered attempt to establish connection with the remote host. The connection details are:

• There was application-defined hook procedure installed into the hook chain (e.g. to monitor keystrokes). The installed hook is handled by the following module:
• %ProgramFiles%\Internet Explorer\iexplore.exe

• Notes:
• %ProgramFiles% is a variable that refers to the Program Files folder. A typical path is C:\Program Files.

Outbound traffic (potentially malicious)

• There was an outbound traffic produced on port 81: