Submission Summary:

• Submission details:
• Submission received: 16 January 2009, 05:37:13
• Processing time: 7 min 12 sec
• Submitted sample:
• File MD5: 0x31D99BFF63BB3E6183D9A8072051A13D
• File SHA-1: 0x888466616BB08F2B869E800053D04C04260C71B6
• Filesize: 22,016 bytes
• Alias:
• Mal/Pushdo-A [Sophos]
• TrojanDropper:Win32/Cutwail.AL [Microsoft]

• Summary of the findings:

What's been found	Severity Level
Creates a startup registry entry.
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
Trojan-Downloader.Agent.BWH	Trojan-Downloader.Agent.BWH contacts a remote server in its attempt to secretly download additional threats onto affected machines.

File System Modifications

• The following file was created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%System%\rs32net.exe [file and pathname of the sample #1]	22,016 bytes	MD5: 0x31D99BFF63BB3E6183D9A8072051A13D SHA-1: 0x888466616BB08F2B869E800053D04C04260C71B6	Mal/Pushdo-A [Sophos] TrojanDropper:Win32/Cutwail.AL [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
rs32net.exe	%System%\rs32net.exe	28,672 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	28,672 bytes

• There were new memory pages created in the address space of the system process(es):

Process Name	Process Filename	Allocated Size
svchost.exe	%System%\svchost.exe	4,096 bytes
svchost.exe	%System%\svchost.exe	4,096 bytes
svchost.exe	%System%\svchost.exe	4,096 bytes
svchost.exe	%System%\svchost.exe	4,096 bytes

Registry Modifications

• The newly created Registry Values are:
• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
• rs32net = "%System%\rs32net.exe"

so that rs32net.exe runs every time Windows starts

• [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]
• rs32net = "%System%\rs32net.exe"

so that rs32net.exe runs every time Windows starts

Other details

• There were registered attempts to establish connection with the remote hosts. The connection details are: