ThreatExpert Report: TrojanDropper:Win32/Opachki.A

Submission Summary:

Submission details:

Submission received: 27 January 2009, 06:44:52
Processing time: 6 min 1 sec
Submitted sample:

File MD5: 0xED1048497601D0064171459FE826E694
File SHA-1: 0x4B949C330EA161376B72AFB33612B0CADC83A168
Filesize: 24,064 bytes

Summary of the findings:

What's been found	Severity Level
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	%Temp%\ms.dll %UserProfile%\protect.dll %Programs%\Startup\ChkDisk.dll %System%\autochk.dll	21,504 bytes	MD5: 0x10418FCD3A60D0BB85E736A326C4E73D SHA-1: 0x48FD166534B6A6ABDC05CD18AA634095D4B95BAD	TrojanDropper:Win32/Opachki.A [Microsoft]
2	%Temp%\nsrbgxod.bak	0 bytes	MD5: 0xD41D8CD98F00B204E9800998ECF8427E SHA-1: 0xDA39A3EE5E6B4B0D3255BFEF95601890AFD80709	(not available)
3	%Programs%\Startup\ChkDisk.lnk	655 bytes	MD5: 0x6F61156F14AEED438770D31391E67EC9 SHA-1: 0x277B806CEC1AEDE9F9B934B7DD655D0BBB542597	(not available)
4	[file and pathname of the sample #1]	24,064 bytes	MD5: 0xED1048497601D0064171459FE826E694 SHA-1: 0x4B949C330EA161376B72AFB33612B0CADC83A168	(not available)

Notes:

%Temp% is a variable that refers to the temporary folder in the short path form. By default, this is C:\Documents and Settings\[UserName]\Local Settings\Temp\ (Windows NT/2000/XP).
%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).
%Programs% is a variable that refers to the file system directory that contains the user's program groups. A typical path is C:\Documents and Settings\[UserName]\Start Menu\Programs.
%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).

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]	28,672 bytes

Registry Modifications

The newly created Registry Values are:

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

autochk = "rundll32.exe %System%\autochk.dll,_IWMPEvents@16"

so that autochk.dll runs every time Windows starts

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

autochk = "rundll32.exe %UserProfile%\protect.dll,_IWMPEvents@16"

so that protect.dll runs every time Windows starts

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