ThreatExpert Report: Backdoor.Sinowal!sd6, Backdoor.Win32.Sinowal.wj, PWS:Win32/Sinowal.gen!M..

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Submission Summary:

Submission details:

Submission received: 24 October 2008, 06:56:24
Processing time: 7 min 37 sec
Submitted sample:

File MD5: 0xB77DE4BAF7F790AB4430339E543BEBEE
File SHA-1: 0x0872DD84DFA09BB47AB4683CCC93F3A87E67EADD
Filesize: 310,344 bytes
Alias:

Backdoor.Sinowal!sd6 [PCTools]
Backdoor.Win32.Sinowal.wj [Kaspersky Lab]
PWS:Win32/Sinowal.gen!M [Microsoft]

Summary of the findings:

What's been found	Severity Level
Threat characteristics of Mebroot (aka Mbroot/StealthMBR), a backdoor trojan that overwrites the Master Boot Record (MBR) of the hard disk and uses rootkit techniques to hide itself.
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

Attention! Characteristics of the following security risk was identified in the system:

Security Risk	Description
Backdoor.Sinowal!sd6	Backdoor.Sinowal!sd6 is a malicious application that runs in the background and allows remote access to your system, giving the attacker full control of your system.

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	%Temp%\1.tmp	257,096 bytes	MD5: 0x7A19D5E37730FCF606720304DC8029BA SHA-1: 0x7D93412A194002A3AC18FBF516B95598F205187F	Backdoor.Sinowal!sd6 [PCTools] Backdoor.Win32.Sinowal.wl [Kaspersky Lab] PWS:Win32/Sinowal.gen!M [Microsoft]
2	%Temp%\2.tmp	310,344 bytes	MD5: 0xD6E074A1FAA6D07B1442783E5B7A42B4 SHA-1: 0x8FC2F4DA19BC88E357FB4DBA2442B4C6860FE49A	PWS:Win32/Sinowal.gen!M [Microsoft]
3	[file and pathname of the sample #1]	310,344 bytes	MD5: 0xB77DE4BAF7F790AB4430339E543BEBEE SHA-1: 0x0872DD84DFA09BB47AB4683CCC93F3A87E67EADD	Backdoor.Sinowal!sd6 [PCTools] Backdoor.Win32.Sinowal.wj [Kaspersky Lab] PWS:Win32/Sinowal.gen!M [Microsoft]

Note:

%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).

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
[filename of the sample #1]	[file and pathname of the sample #1]	327,680 bytes
1.tmp	%Temp%\1.tmp	267,336 bytes

Other details

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

Global\DD8D9E3C36AD47F8937D59F372EFF498

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