ThreatExpert Report: VBObfus.da, Trojan-Dropper

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Submission Summary:

Submission details:

Submission received: 18 August 2012, 05:55:49
Processing time: 7 min 51 sec
Submitted sample:

File MD5: 0x661AA15633D2967C481EE82161F3E4FF
File SHA-1: 0x84186722428091802EB2A8A6202EAF76A77DA3B5
Filesize: 229,376 bytes
Alias:

VBObfus.da [McAfee]
Trojan-Dropper [Ikarus]

Summary of the findings:

What's been found	Severity Level
Modifies some system settings that may have negative impact on overall system security state.
Creates a startup registry entry.

Technical Details:

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%UserProfile%\nwveof.exe	229,376 bytes	MD5: 0x1B92FDFC0BF3C83BDA57DCE2F9A438E3 SHA-1: 0xA6CBDEDED7ECD4DFAE6D6AE793292E77F25988CA	VBObfus.da [McAfee] Trojan-Dropper [Ikarus]
2	[file and pathname of the sample #1]	229,376 bytes	MD5: 0x661AA15633D2967C481EE82161F3E4FF SHA-1: 0x84186722428091802EB2A8A6202EAF76A77DA3B5	VBObfus.da [McAfee] Trojan-Dropper [Ikarus]

Note:

%UserProfile% is a variable that specifies the current user's profile folder. By default, this is C:\Documents and Settings\[UserName] (Windows NT/2000/XP).

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]	245,760 bytes
nwveof.exe	%UserProfile%\nwveof.exe	245,760 bytes

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU

The newly created Registry Values are:

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU]

NoAutoUpdate = 0x00000001

to disable automatic Windows Updates

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]

nwveof = "%UserProfile%\nwveof.exe /f"
nwveof = "%UserProfile%\nwveof.exe /x"

so that nwveof.exe runs every time Windows starts

Other details

To mark the presence in the system, the following Mutex object was created:

The following port was open in the system:

Port	Protocol	Process
1033	TCP	[file and pathname of the sample #1]

The following Host Names were requested from a host database:

192.5.5.241
ns1.chopsuwey.com

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

Remote Host	Port Number
ns1.chopsuwey.com	8000

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