Backdoor:W32/SdBot.CNG

Classification

Type:Backdoor

Virus.Win32.Virut, Backdoor.Generic.178032, Worm:Win32/Neeris.AN (Microsoft) , W32/Virut.gen.A (McAfee)

Summary

A remote administration tool (RAT) that bypasses the security features of a program, computer or network to give unauthorized access or control to its user.

Removal

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.

Technical Details

Backdoor:W32/SdBot.CNG is a backdoor program that can be controlled by an attacker through an Internet Relay Chat (IRC) channel. The program itself is usually sized around 28 to 55 kB.

Distribution

SdBot.CNG is propagated through multiple vectors:

Removable media such as USB thumb drives
Instant Messaging (IM) networks (e.g., AIM, MSN, ICQ and Triton)
Network shares
Peer-to-Peer (P2P) networks (e.g., Edonkey2000, Morpheus, KAZAA, LimeWire, BearShare and Grokster) via the application's shared folders

Installation

During installation, SdBot.CNG creates a copy of itself in one of these folders:

%windir%system\VMwareservice.exe
%windir%system32\csrsc.exe

Activity

While active, the backdoor has the following functionalities:

Perform SYN Floods
Perform Distributed Denial of Service (DDoS) attacks
View MSN, AIM and Triton threads
Propagate via AIM, MSN and Triton
Download files
Update itself
Steal passwords from Protected Storage
View and create processes
Visit user defined websites
Perform shell executions

SdBot.CNG is also able to detect applications or services such as VMware, Nepenthes, sandboxes and honeypots.

Registry

The backdoor program creates on of the following Registry keys in order to automatically execute the copy of itself saved in the Windows directory:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VMwareService = "VMwareService.exe"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\VMwareService = "VMwareService.exe"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinSpoolSvc = "csrsc.exe"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentSet001\Services\WinSpoolSvc = "csrsc.exe"

It also creates the following Autorun.inf to facilitate its propagation on removal media such as USB thumb drives:

[autorun] open = RECYCLER\S-1-6-21-2434476501-1644491937-600003330-1213\autorunme.exe icon=%SystemRoot%\system32\SHELL32.dll,4 action=Open folder to view files

[autorun] open = RECYCLER\S-1-6-21-2434476501-1644491937-600003330-1213\autorunme.exe icon=%SystemRoot%\system32\SHELL32.dll,4 action=Open folder to view files shell\open=Open shell\open\command=RECYCLER\S-1-6-21-2434476501-1644491937-600003330-1213\autorunme.exe shell\open\default=1