ThreatExpert Report: W32.Changeup, Worm.Win32.VBNA.a, MultiDropper-TD, WORM

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Submission Summary:

Submission details:

Submission received: 24 September 2012, 04:28:05
Processing time: 9 min 45 sec
Submitted sample:

File MD5: 0xFA34B48E28C08BFA37781B352A7D388D
File SHA-1: 0xD4C92ACC7C0E35F8E3C943B1B228788AEC4B5777
Filesize: 32,256 bytes
Alias:

W32.Changeup [Symantec]
Worm.Win32.VBNA.a [Kaspersky Lab]
MultiDropper-TD [McAfee]
WORM_CREEPS.A [Trend Micro]
W32/SillyFDC-DN [Sophos]
Worm:Win32/Vobfus.F [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 category was identified:

Threat Category	Description
	A network-aware worm that attempts to replicate across the existing network(s)

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%UserProfile%\%UserName%.exe	32,256 bytes	MD5: 0xADBE2C1A7831B7E73F9A3D1F25AD6703 SHA-1: 0x5BA029FE63276ECFDB12B54F95A9EC3FA645A93E	W32.Changeup [Symantec] Worm.Win32.VBNA.a [Kaspersky Lab] MultiDropper-TD [McAfee] WORM_CREEPS.A [Trend Micro] W32/SillyFDC-DN [Sophos] Worm:Win32/Vobfus.F [Microsoft] Worm.Win32.VBNA [Ikarus]
2	[file and pathname of the sample #1]	32,256 bytes	MD5: 0xFA34B48E28C08BFA37781B352A7D388D SHA-1: 0xD4C92ACC7C0E35F8E3C943B1B228788AEC4B5777	W32.Changeup [Symantec] Worm.Win32.VBNA.a [Kaspersky Lab] MultiDropper-TD [McAfee] WORM_CREEPS.A [Trend Micro] W32/SillyFDC-DN [Sophos] Worm:Win32/Vobfus.F [Microsoft] Worm.Win32.VBNA [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]	49,152 bytes
%UserName%.exe	%UserProfile%\%UserName%.exe	49,152 bytes

Registry Modifications

The newly created Registry Value is:

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

%UserName% = "%UserProfile%\%UserName%.exe"

so that %UserName%.exe runs every time Windows starts

Other details

The data identified by the following URLs was then requested from the remote web server:

http://imagehut2.cn/data/data.dat
localhost

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