ThreatExpert Report: Trojan.Win32.Refroso

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Submission Summary:

Submission details:

Submission received: 7 September 2012, 10:51:49
Processing time: 7 min 48 sec
Submitted sample:

File MD5: 0xBD7DD75881666A2936529B5906CBD0F5
File SHA-1: 0x13F93517E36F94093B042F8321D2D8153EFEA910
Filesize: 356,945 bytes
Alias & packer info:

Trojan.Win32.Refroso [Ikarus]
packed with: PE_Patch.Molebox [Kaspersky Lab]

Technical Details:

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%AppData%\addons.dat	25,296 bytes	MD5: 0x5B2AB8569EDEE09905CED863F7949AAC SHA-1: 0xE5CBF7064AD88A3ABCD288361554AABEE769ECCB	(not available)
2	[file and pathname of the sample #1] %System%\system\DUC.exe	356,945 bytes	MD5: 0xBD7DD75881666A2936529B5906CBD0F5 SHA-1: 0x13F93517E36F94093B042F8321D2D8153EFEA910	Trojan.Win32.Refroso [Ikarus] packed with PE_Patch.Molebox [Kaspersky Lab]
3	%System%\system\logg.dat	0 bytes	MD5: 0xD41D8CD98F00B204E9800998ECF8427E SHA-1: 0xDA39A3EE5E6B4B0D3255BFEF95601890AFD80709	(not available)

Notes:

%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.
%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).

The following directory was created:

%System%\system

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
duc.exe	%System%\system\duc.exe	35,168 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	589,824 bytes

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{1AE7C0FF-5C6B-D61C-C738-6CDC874EE69C}
HKEY_LOCAL_MACHINE\SOFTWARE\system
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\MediaResources\msvideo
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources\msvideo
HKEY_CURRENT_USER\Software\system

The newly created Registry Values are:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{1AE7C0FF-5C6B-D61C-C738-6CDC874EE69C}]

stubpath = "%System%\system\DUC.exe s"

so that DUC.exe runs every time Windows starts

[HKEY_LOCAL_MACHINE\SOFTWARE\system]

nck = EF 17 F8 2F A2 23 A2 32 74 C3 CD 74 FA 93 5B 67

[HKEY_CURRENT_USER\Software\system]

klg = 01
delay = B0 0C 32 7A 21 8D CD 01
plg1 = EA 44 DC 02 A3 27 D7 5F 11 AD B9 07 DA F2 35 03 2A 35 8E 58 1B 0E 11 94 D4 F9 28 1F 11 4D 98 BC D2 64 44 8E CD F9 B9 BA 23 BD 45 ED 15 A6 77 AF B8 7C 04 4D 90 91 58 5F 81 61 19 72 00 4E 53 7A E1 AB E6 8B 30 CA 34 56 F9 AD AD F8 4D 41 0F F6 9F 90 A2 1

Other details

The following Host Names were requested from a host database:

192.5.5.241
newsetup.no-ip.biz

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

Remote Host	Port Number
newsetup.no-ip.biz	81

Outbound traffic (potentially malicious)

There was an outbound traffic produced on port 81:

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