Submission Summary:

• Submission details:
• Submission received: 25 September 2009, 14:21:32
• Processing time: 5 min 49 sec
• Submitted sample:
• File MD5: 0xE9D8F86E6A55DB41D828430A04FCAEF5
• File SHA-1: 0x5242F8FAC61740AFE3E26C5D4D679AA028C56AD5
• Filesize: 743,559 bytes
• Alias: Win-Trojan/Agent.600192 [AhnLab]

• Summary of the findings:

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

Technical Details:

• The new window was created, as shown below:

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	25,036 bytes	MD5: 0xFCAD2D1AA6404AC64B6FB50E69E95366 SHA-1: 0xE0FEF717EB692A2084410E2F2EBBE51612BAD864	(not available)
2	%Temp%\1.exe %System%\Bifrost\photo.exe	241,552 bytes	MD5: 0x95D027CE65B012B3FF7780A713C7053C SHA-1: 0x738A1ACF137D8E8540242F8D1F367559E3EF0C2C	BackDoor-DKI.gen.aj [McAfee] VirTool:Win32/VBInject.CA [Microsoft] VirTool.Win32.VBInject [Ikarus] Win-Trojan/Poison.139264.C [AhnLab]
3	%Temp%\Fix Hosts.exe	32,768 bytes	MD5: 0xBD7B76CE8620CDB88A14F33A34A22B2D SHA-1: 0x9CC43EB476D83011D6A24457C153489ECF28F792	(not available)
4	%System%\Bifrost\logg.dat	0 bytes	MD5: 0xD41D8CD98F00B204E9800998ECF8427E SHA-1: 0xDA39A3EE5E6B4B0D3255BFEF95601890AFD80709	(not available)
5	[file and pathname of the sample #1]	743,559 bytes	MD5: 0xE9D8F86E6A55DB41D828430A04FCAEF5 SHA-1: 0x5242F8FAC61740AFE3E26C5D4D679AA028C56AD5	Win-Trojan/Agent.600192 [AhnLab]

• 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.
• %Temp% is a variable that refers to the temporary folder in the short path form. By default, this is C:\Documents and Settings\[UserName]\Local Settings\Temp\ (Windows NT/2000/XP).
• %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 was a new process created in the system:

• Attention! The following process was intentionally hidden from the user:

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

Registry Modifications

• The following Registry Keys were created:
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{B57FD257-5CE8-4A5B-32BD-2709F8F46ECE}
• 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\{B57FD257-5CE8-4A5B-32BD-2709F8F46ECE}]
• stubpath = "%System%\Bifrost\photo.exe s"

so that photo.exe runs every time Windows starts

• [HKEY_LOCAL_MACHINE\SOFTWARE\Bifrost]
• nck = C4 0D E8 27 BE 2D A2 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 06 BD BE 33 FC 44 38 26 56 14 E7 3F 84 AB B3 1D F6 FE DC B1 1

Other details

• Analysis of the file resources indicate the following possible country of origin:

	United Kingdom