Submission Summary:

• Submission details:
• Submission received: 21 September 2012, 18:12:16
• Processing time: 7 min 38 sec
• Submitted sample:
• File MD5: 0xAD7BF36564C93D25D5979024E8EAEEC3
• File SHA-1: 0xD6D75374246737283C268705880FC5C49A9283D9
• Filesize: 31,964 bytes
• Alias:
• Backdoor.Bifrose [Symantec]
• Backdoor.Win32.Bifrose.fxu [Kaspersky Lab]
• BackDoor-CEP.gen.cm [McAfee]
• Mal/Bifrose-X [Sophos]
• Backdoor:Win32/Bifrose.HZ [Microsoft]
• Virus.Win32.Bifrose [Ikarus]
• Win-Trojan/Bifrose.31964 [AhnLab]

Technical Details:

Possible Security Risk

• Attention! The following threat category was identified:

Threat Category	Description
	A malicious backdoor trojan that runs in the background and allows remote access to the compromised system

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]	31,964 bytes	MD5: 0xAD7BF36564C93D25D5979024E8EAEEC3 SHA-1: 0xD6D75374246737283C268705880FC5C49A9283D9	Backdoor.Bifrose [Symantec] Backdoor.Win32.Bifrose.fxu [Kaspersky Lab] BackDoor-CEP.gen.cm [McAfee] Mal/Bifrose-X [Sophos] Backdoor:Win32/Bifrose.HZ [Microsoft] Virus.Win32.Bifrose [Ikarus] Win-Trojan/Bifrose.31964 [AhnLab]

• 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	35,168 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	35,168 bytes

• Attention! The following processes were intentionally hidden from the user:

Process Name	Main Module Size
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes
IEXPLORE.EXE	102,400 bytes

• There was a new memory page created in the address space of the system process(es):

Process Name	Process Filename	Allocated Size
server.exe	%System%\bifrost\server.exe	2,060,288 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 Names were requested from a host database:
• lahouar.no-ip.biz
• 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: