Submission Summary:

• Submission details:
• Submission received: 31 January 2009, 17:03:52
• Processing time: 7 min 44 sec
• Submitted sample:
• File MD5: 0x38C404441E0F1B6BFA0E2B91C3FE2D4B
• File SHA-1: 0x00FDBD88AE2DA467AECB6465210EBCB0F87E76A2
• Filesize: 22,016 bytes
• Alias:
• Trojan-Downloader.Small!sd6 [PCTools]
• Trojan.Pandex [Symantec]
• Trojan-Downloader.Win32.Small.aiuq [Kaspersky Lab]
• Mal/Pushdo-A [Sophos]
• Trojan:Win32/Meredrop [Microsoft]
• Trojan.Win32.Agentb [Ikarus]

• 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 risks were identified in the system:

Security Risk	Description
Trojan-Downloader.Small!sd6	Trojan-Downloader.Small!sd6 attempts to download malicious files to the local computer and execute them.
Trojan-Downloader.Agent.BWH	Trojan-Downloader.Agent.BWH contacts a remote server in its attempt to secretly download additional threats onto affected machines.

• 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 trojan horse or bot that may represent security risk for the compromised system and/or its network environment

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: 0x38C404441E0F1B6BFA0E2B91C3FE2D4B SHA-1: 0x00FDBD88AE2DA467AECB6465210EBCB0F87E76A2	Trojan-Downloader.Small!sd6 [PCTools] Trojan.Pandex [Symantec] Trojan-Downloader.Win32.Small.aiuq [Kaspersky Lab] Mal/Pushdo-A [Sophos] Trojan:Win32/Meredrop [Microsoft] Trojan.Win32.Agentb [Ikarus]

• 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

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: