ThreatExpert Report: W32.SillyIM, W32/Sdbot.worm, BKDR

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Submission Summary:

Submission details:

Submission received: 11 July 2008, 09:45:49
Processing time: 3 min 27 sec
Submitted sample:

File MD5: 0x7029A5FEDDC61E7DA347B80C0FA3CC48
File SHA-1: 0x431D7E328245DFD493FCE228901C97AF2912F7B2
Filesize: 43,803 bytes
Alias:

W32.SillyIM [Symantec]
W32/Sdbot.worm [McAfee]
BKDR_IRCBOT.BXC [Trend Micro]

Summary of the findings:

What's been found	Severity Level
Communication with a remote IRC server.
Creates a startup registry entry.
Contains characteristics of an identified security risk.

Technical Details:

The new window was created, as shown below:

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Possible Security Risk

Attention! The following threat category was identified:

Threat Category	Description
	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	[file and pathname of the sample #1] %Windir%\wksvcsc.exe	43,803 bytes	MD5: 0x7029A5FEDDC61E7DA347B80C0FA3CC48 SHA-1: 0x431D7E328245DFD493FCE228901C97AF2912F7B2	W32.SillyIM [Symantec] W32/Sdbot.worm [McAfee] BKDR_IRCBOT.BXC [Trend Micro]

Note:

%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
wksvcsc.exe	%Windir%\wksvcsc.exe	311,296 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	24,576 bytes

Registry Modifications

The newly created Registry Value is:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]

Windows UDP Control Services = "wksvcsc.exe"

so that wksvcsc.exe runs every time Windows starts

Other details

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

wssuck

The following ports were open in the system:

Port	Protocol	Process
1034	TCP	wksvcsc.exe (%Windir%\wksvcsc.exe)
1035	TCP	wksvcsc.exe (%Windir%\wksvcsc.exe)

The following Host Name was requested from a host database:

m.bihsecurity.com

There was registered attempt to establish connection with the remote host. The connection details are:

Remote Host	Port Number
m.bihsecurity.com	1868

Outbound traffic (potentially malicious)

Attention! There was a new connection established with a remote IRC Server. The generated outbound IRC traffic is provided below:

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