Submission Summary:

• Submission details:
• Submission received: 31 August 2008, 15:02:14
• Processing time: 5 min 22 sec
• Submitted sample:
• File MD5: 0xCA80AF10A4EE1A5209C739784A6F4948
• File SHA-1: 0x44CD360107B00BF68C8308D97FA524760BB81DEE
• Filesize: 134,144 bytes
• Alias:
• W32.Spybot.Worm [Symantec]
• Backdoor.Win32.Rbot.gen [Kaspersky Lab]
• BKDR_RBOT.DZT [Trend Micro]

• Summary of the findings:

What's been found	Severity Level
A network-aware worm that uses known exploit(s) in order to replicate across vulnerable networks.
MS04-012: DCOM RPC Overflow exploit - replication across TCP 135/139/445/593 (common for Blaster, Welchia, Spybot, Randex, other IRC Bots).
MS04-011: LSASS Overflow exploit - replication across TCP 445 (common for Sasser, Bobax, Kibuv, Korgo, Gaobot, Spybot, Randex, other IRC Bots).
Communication with a remote IRC server.
Produces outbound traffic.
Creates a startup registry entry.
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

• Attention! The following threat categories were identified:

Threat Category	Description
	A network-aware worm that attempts to replicate across the existing network(s)
	A malicious backdoor trojan that runs in the background and allows remote access to the compromised system

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] %System%\ywgma.exe %System%\yywbl.exe	134,144 bytes	MD5: 0xCA80AF10A4EE1A5209C739784A6F4948 SHA-1: 0x44CD360107B00BF68C8308D97FA524760BB81DEE	W32.Spybot.Worm [Symantec] Backdoor.Win32.Rbot.gen [Kaspersky Lab] BKDR_RBOT.DZT [Trend Micro]

• 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
yywbl.exe	%System%\yywbl.exe	754,563 bytes
ywgma.exe	%System%\ywgma.exe	754,563 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	754,563 bytes

Registry Modifications

• The following Registry Key was created:
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices

• The newly created Registry Values are:
• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
• Windows Service Agents = "ywgma.exe"

so that ywgma.exe runs every time Windows starts

• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
• Windows Service Agents = "ywgma.exe"

so that ywgma.exe runs every time Windows starts

• [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]
• Windows Service Agents = "ywgma.exe"

so that ywgma.exe runs every time Windows starts

Other details

• To mark the presence in the system, the following Mutex object was created:
• 910860

• The following Host Name was requested from a host database:
• bader.q8cv.org

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

Outbound traffic (potentially malicious)

• There was an outbound traffic produced on port 32321: