ThreatExpert Report: Generic VB.gu, Mal/Generic-L, Worm:Win32/Dorkbot.I, Trojan-Dropper.Win32.VB

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Submission Summary:

Submission details:

Submission received: 5 October 2012, 19:12:24
Processing time: 7 min 53 sec
Submitted sample:

File MD5: 0x032140C801B6A09B73A71DBB49F8F91C
File SHA-1: 0x2A8CA2F670A343CE4723A5F27890C1680A30068B
Filesize: 120,850 bytes
Alias & packer info:

Generic VB.gu [McAfee]
Mal/Generic-L [Sophos]
Worm:Win32/Dorkbot.I [Microsoft]
Trojan-Dropper.Win32.VB [Ikarus]
packed with: PE_Patch [Kaspersky Lab]

Summary of the findings:

What's been found	Severity Level
Communication with a remote IRC server.
Creates a startup registry entry.

Technical Details:

File System Modifications

The following file was created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%AppData%\Wcxaxw.exe [file and pathname of the sample #1]	120,850 bytes	MD5: 0x032140C801B6A09B73A71DBB49F8F91C SHA-1: 0x2A8CA2F670A343CE4723A5F27890C1680A30068B	Generic VB.gu [McAfee] Mal/Generic-L [Sophos] Worm:Win32/Dorkbot.I [Microsoft] Trojan-Dropper.Win32.VB [Ikarus] packed with PE_Patch [Kaspersky Lab]

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 memory pages created in the address space of the system process(es):

Process Name	Process Filename	Allocated Size
services.exe	%System%\services.exe	319,488 bytes
svchost.exe	%System%\svchost.exe	319,488 bytes
svchost.exe	%System%\svchost.exe	319,488 bytes
svchost.exe	%System%\svchost.exe	319,488 bytes
svchost.exe	%System%\svchost.exe	319,488 bytes
svchost.exe	%System%\svchost.exe	319,488 bytes
alg.exe	%System%\alg.exe	319,488 bytes

Notes:

%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).

Registry Modifications

The newly created Registry Value is:

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

Wcxaxw = "%AppData%\Wcxaxw.exe"

so that Wcxaxw.exe runs every time Windows starts

Other details

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

470a1245-Mutex

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