Submission Summary:

• Submission details:
• Submission received: 2 June 2010, 22:16:56
• Processing time: 9 min 31 sec
• Submitted sample:
• File MD5: 0x24EB9E7F6E5A6DEDBC32B66B0B645874
• File SHA-1: 0x7E1C2620AA413B23202C2AAD4D60B008E6B45E39
• Filesize: 162,326 bytes
• Alias: Win-Trojan/Spybot.162358 [AhnLab]

• Summary of the findings:

What's been found	Severity Level
Produces outbound traffic.
Creates a startup registry entry.
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

• Attention! Characteristics of the following security risk was identified in the system:

Security Risk	Description
Backdoor.Bifrose	Backdoor.Bifrose is a backdoor trojan that attempts to propagate by exploiting local network shares. It will also attempt to join a predefined IRC server and channel in order to participate in DDoS attacks.

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]	162,326 bytes	MD5: 0x24EB9E7F6E5A6DEDBC32B66B0B645874 SHA-1: 0x7E1C2620AA413B23202C2AAD4D60B008E6B45E39	Win-Trojan/Spybot.162358 [AhnLab]

• 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]	49,152 bytes
server.exe	%ProgramFiles%\bifrost\server.exe	49,152 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

Outbound traffic (potentially malicious)

• There was an outbound traffic produced on port 81: