Submission Summary:

• Submission details:
• Submission received: 6 October 2012, 11:09:15
• Processing time: 8 min 0 sec
• Submitted sample:
• File MD5: 0xD9EE9BEDEDBA40C689F1CBA3EAD2A915
• File SHA-1: 0xAAA5F74CFDB8D8AB72044993E8A33F2A3E7B0237
• Filesize: 330,095 bytes
• Alias: Trojan-Dropper.Win32.Dapato [Ikarus]

• 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 files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%AppData%\addons.dat	24,724 bytes	MD5: 0x0818FE7260CA33C0BE74387CE1E63630 SHA-1: 0x6FAA3307D8DFCFBD295C7B8C331A95EEB6E3D354	(not available)
2	%ProgramFiles%\Bifrost\logg.dat	0 bytes	MD5: 0xD41D8CD98F00B204E9800998ECF8427E SHA-1: 0xDA39A3EE5E6B4B0D3255BFEF95601890AFD80709	(not available)
3	%ProgramFiles%\Bifrost\server.exe [file and pathname of the sample #1]	330,095 bytes	MD5: 0xD9EE9BEDEDBA40C689F1CBA3EAD2A915 SHA-1: 0xAAA5F74CFDB8D8AB72044993E8A33F2A3E7B0237	Trojan-Dropper.Win32.Dapato [Ikarus]

• 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.
• %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
server.exe	%ProgramFiles%\Bifrost\server.exe	32,768 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	32,768 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
IEXPLORE.EXE	102,400 bytes

Registry Modifications

• The following Registry Keys were created:
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{F55C41BE-E9EF-F168-F265-5E630FBC7F01}
• 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\{F55C41BE-E9EF-F168-F265-5E630FBC7F01}]
• 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 = 01
• plg1 = EA 44 DC 02 A3 27 D7 5F 11 AD B9 07 DA F2 35 03 2A 35 8E 58 1B 0E 11 94 D4 F9 28 1F 11 4D 98 BC D2 64 44 8E CD F9 B9 BA 23 BD 45 ED 15 A6 77 AF B8 7C 04 4D 90 91 58 5F 81 61 19 72 00 4E 53 7A E1 AB E6 8B 30 CA 34 56 F9 AD AD F8 4D 41 0F F6 9F 90 A2 1

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:
• max15.myftp.biz

• 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

Outbound traffic (potentially malicious)

• There was an outbound traffic produced on port 81: