ThreatExpert Report: Backdoor.Trojan, Trojan-Downloader.Win32.Murlo.acs, Downloader-BTB..

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Submission Summary:

Submission details:

Submission received: 25 October 2012, 15:51:41
Processing time: 9 min 4 sec
Submitted sample:

File MD5: 0x1C85C12629194C75CF2622CBE76D290E
File SHA-1: 0x80B00F0C25E8936A8E0762EDDC1781A7E4598916
Filesize: 59,904 bytes
Alias:

Backdoor.Trojan [Symantec]
Trojan-Downloader.Win32.Murlo.acs [Kaspersky Lab]
Downloader-BTB [McAfee]
Troj/Adpcli-Gen [Sophos]
Trojan:Win32/Adpclient [Microsoft]
Trojan.Win32.Adpclient [Ikarus]
Win-Trojan/Downloader.59904.X [AhnLab]

Summary of the findings:

What's been found	Severity Level
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

Attention! The following threat categories were identified:

Threat Category	Description
	A program that downloads files to the local computer that may represent security risk
	A malicious backdoor trojan that runs in the background and allows remote access to the compromised system

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%Temp%\mta23441.dll	612,352 bytes	MD5: 0x3F795D6FB4050C93CBBD0FF699A2635A SHA-1: 0xD6F6FF1E3809C980CA78710E842AC3F1C1697E92	(not available)
2	%System%\comsa32.sys	8 bytes	MD5: 0x56CB28715C35204BE51906D436828AF0 SHA-1: 0xFBD155D4BC522FD5FEE793DCEE40527E353C57F8	(not available)
3	[file and pathname of the sample #1]	59,904 bytes	MD5: 0x1C85C12629194C75CF2622CBE76D290E SHA-1: 0x80B00F0C25E8936A8E0762EDDC1781A7E4598916	Backdoor.Trojan [Symantec] Trojan-Downloader.Win32.Murlo.acs [Kaspersky Lab] Downloader-BTB [McAfee] Troj/Adpcli-Gen [Sophos] Trojan:Win32/Adpclient [Microsoft] Trojan.Win32.Adpclient [Ikarus] Win-Trojan/Downloader.59904.X [AhnLab]

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).
%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]	81,920 bytes

Other details

Analysis of the file resources indicate the following possible country of origin:

China

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

sy090221

The following port was open in the system:

Port	Protocol	Process
1033	UDP	[file and pathname of the sample #1]

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