ThreatExpert Report: Backdoor:Win32/Fynloski.A, Win32.VBCrypt

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Submission Summary:

Submission details:

Submission received: 6 October 2012, 01:53:43
Processing time: 9 min 23 sec
Submitted sample:

File MD5: 0x618F46EDA92A5549B7F12D855E483A43
File SHA-1: 0xBC8711C4AB92622ADBE8AA4592FD722FA6768B95
Filesize: 331,776 bytes
Alias:

Backdoor:Win32/Fynloski.A [Microsoft]
Win32.VBCrypt [Ikarus]

Summary of the findings:

What's been found	Severity Level
Produces outbound traffic.
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	%AppData%\Winlogin.exe	331,776 bytes	MD5: 0x4CFDAD263392BBA4017484CCE6F45F40 SHA-1: 0xC82E5AA6066CE3A8EB79D96CD5F77A8CA61E9F87	Backdoor:Win32/Fynloski.A [Microsoft] Win32.VBCrypt [Ikarus]
2	[file and pathname of the sample #1]	331,776 bytes	MD5: 0x618F46EDA92A5549B7F12D855E483A43 SHA-1: 0xBC8711C4AB92622ADBE8AA4592FD722FA6768B95	Backdoor:Win32/Fynloski.A [Microsoft] Win32.VBCrypt [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.

The following directory was created:

%AppData%\dclogs

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]	356,352 bytes
Winlogin.exe	%AppData%\Winlogin.exe	356,352 bytes

There was a new memory page created in the address space of the system process(es):

Process Name	Process Filename	Allocated Size
explorer.exe	%Windir%\explorer.exe	847,872 bytes

Notes:

%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

Registry Modifications

The newly created Registry Value is:

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

Windows Login Service = "%AppData%\Winlogin.exe"

so that Winlogin.exe runs every time Windows starts

Other details

The following Host Name was requested from a host database:

ztwerfdgdhfjkkl.zapto.org

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

Remote Host	Port Number
ztwerfdgdhfjkkl.zapto.org	1607

Outbound traffic (potentially malicious)

There was an outbound traffic produced on port 1607:

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