Submission Summary:

• Submission details:
• Submission received: 31 August 2008, 17:02:30
• Processing time: 4 min 49 sec
• Submitted sample:
• File MD5: 0x18F2C17C718F5B1856B4088F8C348712
• File SHA-1: 0x36AD9FC3FF60D71D01834FA75D6CCF4050160289
• Filesize: 159,744 bytes
• Alias:
• Worm.RBot.EXS [PCTools]
• W32.Spybot.Worm [Symantec]
• Backdoor.Win32.Rbot.akm [Kaspersky Lab]
• W32/Sdbot.worm.gen.bh [McAfee]
• W32/Rbot-Fam, W32/Rbot-Gen, Mal/IRCBot-B, Mal/Behav-134 [Sophos]
• Backdoor:Win32/Rbot [Microsoft]

• 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).
Capability to perform DoS attacks against other computers.
Capability to terminate Antivirus, Firewall and other security related processes.
Replication across networks by exploiting weakly restricted shares (common for Randex family of worms).
Communication with a remote IRC server.
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
Backdoor.Rbot.Gen	Backdoor.Rbot.Gen is an IRC controlled backdoor (or "bot") that can be used to gain unauthorized access to a victim's machine. It can also exhibit worm-like functionality by exploiting weak passwords on network shares.

• 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 trojan horse or bot that may represent security risk for the compromised system and/or its network environment
	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%\C27D8FEF-D7AE-42c0-82E6-F30598265639.exe	3,584 bytes	MD5: 0x7152446FD31220DD1038B6F7D95AB8A3 SHA-1: 0x355B3BFAE2FF8BF09A040834ADAE611F85820B02	Backdoor.Rbot.Gen [PCTools] Trojan.Win32.KillFiles.im [Kaspersky Lab] VirTool:Win32/Cleanmbx.A [Microsoft]
2	%System%\msnservex.exe [file and pathname of the sample #1]	159,744 bytes	MD5: 0x18F2C17C718F5B1856B4088F8C348712 SHA-1: 0x36AD9FC3FF60D71D01834FA75D6CCF4050160289	Worm.RBot.EXS [PCTools] W32.Spybot.Worm [Symantec] Backdoor.Win32.Rbot.akm [Kaspersky Lab] W32/Sdbot.worm.gen.bh [McAfee] W32/Rbot-Fam, W32/Rbot-Gen, Mal/IRCBot-B, Mal/Behav-134 [Sophos] Backdoor:Win32/Rbot [Microsoft]

• Notes:
• %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).
• %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
msnservex.exe	%System%\msnservex.exe	638,976 bytes
C27D8FEF-D7AE-42c0-82E6-F30598265639.exe	%Temp%\C27D8FEF-D7AE-42c0-82E6-F30598265639.exe	16,384 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	638,976 bytes

Registry Modifications

• The following Registry Keys were created:
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
• HKEY_CURRENT_USER\Software\Microsoft\OLE

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

so that msnservex.exe runs every time Windows starts

• [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
• AdobeReaderPro = "msnservex.exe"

so that msnservex.exe runs every time Windows starts

• [HKEY_CURRENT_USER\Software\Microsoft\OLE]
• AdobeReaderPro = "msnservex.exe"

Other details

• To mark the presence in the system, the following Mutex object was created:
• rx10B

• The following Host Name was requested from a host database:
• ta.talalvt.us

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

Outbound traffic (potentially malicious)

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

Heuristics Analysis

• Heuristically identified capability to terminate the following security related processes:

• Heuristically identified capability of spreading across the following weakly restricted network shares:

• The network replication uses a dictionary attack by probing credentials from the following list: