ThreatExpert Report: Backdoor.Trojan, Generic BackDoor!bef, Possible

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Submission Summary:

Submission details:

Submission received: 6 November 2009, 15:59:02
Processing time: 7 min 46 sec
Submitted sample:

File MD5: 0xBEFCBF177C6677CFBE13DD9F73585BA4
File SHA-1: 0x30AD4A96525747AF649358B0C4D591630FEC0EAD
Filesize: 516,096 bytes
Alias:

Backdoor.Trojan [Symantec]
Generic BackDoor!bef [McAfee]
Possible_Virus [Trend Micro]
Troj/Bkdr-C [Sophos]
Trojan:Win32/Modphip.A [Microsoft]

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 category was identified:

Threat Category	Description
	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	%System%\riodrv.exe	516,096 bytes	MD5: 0x67CF60312B674C7FC8320C0CE49C3113 SHA-1: 0xEC40120788986F6EEC75D4402C0FEE153D1C0B28	Possible_Virus [Trend Micro] Troj/Bkdr-C [Sophos] Trojan:Win32/Modphip.A [Microsoft]
2	[file and pathname of the sample #1]	516,096 bytes	MD5: 0xBEFCBF177C6677CFBE13DD9F73585BA4 SHA-1: 0x30AD4A96525747AF649358B0C4D591630FEC0EAD	Backdoor.Trojan [Symantec] Generic BackDoor!bef [McAfee] Possible_Virus [Trend Micro] Troj/Bkdr-C [Sophos] Trojan:Win32/Modphip.A [Microsoft]

Note:

%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 were new processes created in the system:

Process Name	Process Filename	Main Module Size
riodrv.exe	%System%\riodrv.exe	540,672 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	540,672 bytes

Registry Modifications

The following Registry Value was modified:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]

Userinit =

Other details

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

visualstudiosrc3k3

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