Submission Summary:

• Submission details:
• Submission received: 5 October 2012, 15:16:29
• Processing time: 8 min 6 sec
• Submitted sample:
• File MD5: 0x71E65A3EBF149F30F91DACB688BCFFDF
• File SHA-1: 0xEC0D46028E2FD5E88269FE2B99BD26FEE4D7E5B0
• Filesize: 131,072 bytes
• Alias:
• Trojan.Gen [Symantec]
• Worm.Win32.VBNA.b [Kaspersky Lab]
• W32/VB-FYB [Sophos]
• Worm:Win32/VB.WL [Microsoft]
• Worm.Win32.VBNA [Ikarus]

• Summary of the findings:

What's been found	Severity Level
Downloads/requests other files from Internet.
Creates a startup registry entry.
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

• Attention! The following threat categories were identified:

Threat Category	Description
	A network-aware worm that attempts to replicate across the existing network(s)
	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	%AppData%\Microsoft\csrss.exe	131,072 bytes	MD5: 0x71E65A3EBF149F30F91DACB688BCFFDF SHA-1: 0xEC0D46028E2FD5E88269FE2B99BD26FEE4D7E5B0	Trojan.Gen [Symantec] Worm.Win32.VBNA.b [Kaspersky Lab] W32/VB-FYB [Sophos] Worm:Win32/VB.WL [Microsoft] Worm.Win32.VBNA [Ikarus]

• Note:
• %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.

Memory Modifications

• There were new processes created in the system:

Process Name	Process Filename	Main Module Size
csrss.exe	%AppData%\microsoft\csrss.exe	139,264 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	139,264 bytes

Registry Modifications

• The following Registry Keys were created:
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run

• The newly created Registry Values are:
• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run]
• csrss = "%AppData%\Microsoft\csrss.exe"

so that csrss.exe runs every time Windows starts

• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
• csrss = "%AppData%\Microsoft\csrss.exe"

so that csrss.exe runs every time Windows starts

• [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run]
• csrss = "%AppData%\Microsoft\csrss.exe"

so that csrss.exe runs every time Windows starts

• [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]
• csrss = "%AppData%\Microsoft\csrss.exe"

so that csrss.exe runs every time Windows starts

• The following Registry Value was modified:
• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
• Userinit =

Other details

• The following Host Names were requested from a host database:
• 192.5.5.241
• habbocallejeros.sytes.net

• There was registered attempt to establish connection with the remote host. The connection details are:

• The following Internet downloads were started (the retrieved bits are saved into the local file):