ThreatExpert Report: Trojan-Dropper.Win32.Dycler

Submission Summary:

Submission details:

Submission received: 22 October 2012, 16:40:58
Processing time: 9 min 49 sec
Submitted sample:

File MD5: 0xCD9DCC53E3C28E730D4C765D3B2F3578
File SHA-1: 0x4BEA8B5DF6BD0D81337F48A076F8EA64811CA5E4
Filesize: 33,280 bytes
Alias: Trojan-Dropper.Win32.Dycler [Ikarus]

Summary of the findings:

What's been found	Severity Level
Creates an executable file in the fake Recycle Bin folder with the purpose of concealing its presence in the system.
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	c:\boot\boot.exe c:\boot\Bootmgr.com %Profiles%\Documents and Settings.exe c:\Inetpub\Inetpub.exe %ProgramFiles%\Program Files.exe c:\RECYCLER\RECYCLER.exe [file and pathname of the sample #1] %Windir%\WINDOWS.exe	33,280 bytes	MD5: 0xCD9DCC53E3C28E730D4C765D3B2F3578 SHA-1: 0x4BEA8B5DF6BD0D81337F48A076F8EA64811CA5E4	Trojan-Dropper.Win32.Dycler [Ikarus]

Notes:

%Profiles% is a variable that refers to the file system directory containing user profile folders. A typical path is C:\Documents and Settings.
%ProgramFiles% is a variable that refers to the Program Files folder. A typical path is C:\Program Files.
%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

The following directory was created:

c:\boot

Memory Modifications

There was a new process created in the system:

Process Name	Process Filename	Main Module Size
[filename of the sample #1]	[file and pathname of the sample #1]	N/A

Registry Modifications

The newly created Registry Value is:

[HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]

shell = ""explorer.exe","C:\Boot\Bootmgr.com""

so that Bootmgr.com runs every time Windows starts

Other details

The following port was open in the system:

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

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