Submission Summary:

• Submission details:
• Submission received: 1 October 2012, 10:13:34
• Processing time: 7 min 31 sec
• Submitted sample:
• File MD5: 0x8D5A381002FC8AB2FCCBB7EBED0A085C
• File SHA-1: 0xD603BCF36936E5BCC27F92353086668BC0159BA8
• Filesize: 147,295 bytes
• Alias:
• Trojan.Gen [Symantec]
• Trojan.Win32.Refroso.dmmy [Kaspersky Lab]
• VirTool:Win32/Injector [Microsoft]
• Gen.Variant.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 file was created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%ProgramFiles%\Bifrost\server.exe [file and pathname of the sample #1]	147,295 bytes	MD5: 0x8D5A381002FC8AB2FCCBB7EBED0A085C SHA-1: 0xD603BCF36936E5BCC27F92353086668BC0159BA8	Trojan.Gen [Symantec] Trojan.Win32.Refroso.dmmy [Kaspersky Lab] VirTool:Win32/Injector [Microsoft] Gen.Variant.Refroso [Ikarus]

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

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

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]	249,856 bytes
server.exe	%ProgramFiles%\bifrost\server.exe	249,856 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 = "%ProgramFiles%\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 = 00

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:

Outbound traffic (potentially malicious)

• There was an outbound traffic produced on port 81: