ThreatExpert Report: Packed.Win32.TDSS.c, Backdoor.Win32.Bezigate

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Submission Summary:

Submission details:

Submission received: 25 October 2012, 20:47:45
Processing time: 8 min 58 sec
Submitted sample:

File MD5: 0x6331E543A55080C9D014A594EB4C3391
File SHA-1: 0xEBCE01331AAF84D26C692294F0E91A338F7219B7
Filesize: 94,208 bytes
Alias:

Packed.Win32.TDSS.c [Kaspersky Lab]
Backdoor.Win32.Bezigate [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 file was created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%Windir%\calhost.exe [file and pathname of the sample #1]	94,208 bytes	MD5: 0x6331E543A55080C9D014A594EB4C3391 SHA-1: 0xEBCE01331AAF84D26C692294F0E91A338F7219B7	Packed.Win32.TDSS.c [Kaspersky Lab] Backdoor.Win32.Bezigate [Ikarus]

Note:

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

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
calhost.exe	%Windir%\calhost.exe	114,688 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	114,688 bytes

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\MediaResources\msvideo
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources\msvideo

The newly created Registry Value is:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]

calhost = ""%Windir%\calhost.exe""

so that calhost.exe runs every time Windows starts

Other details

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

AOWNcF3lQgxIT

The following Host Name was requested from a host database:

localhost

Outbound traffic (potentially malicious)

There was an outbound traffic produced on port 7769:

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