Overview
This is a trojan detection. Unlike viruses, trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs.
Distribution channels include email, malicious or hacked web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.
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Minimum DAT
4741 (2006-04-14) Updated DAT4741 (2006-04-14) |
Minimum Engine
5.1.00 File Length25,092 |
Description Added
2006-04-14 Description Modified2006-04-21 |
Malware Proliferation
Characteristics
Upon execution, the trojan drops the following file.
%WINDIR%\csrss.exe
Then it adds the following registry key.
hkey_current_user\software\microsoft\windows\currentversion\run
system="%WINDIR%\csrss.exe"
The backdoor opens the following ports and waits commands.
port 12321 ftp server
port 2050 cmd.exe
Then it sends the notification to webmaster[removed].com.
The trojan also gathers the user and password information of the following products.
ICQ
Ghisler
Cute FTP
WS_Ftp
Eudora
Miranda IM
Punto Switcher
Outlook and Outlook Express
Becky2
Symptoms
- Presence of the mentioned registry keys and file
- Unexpected ports open
Method of Infection
Trojans do not self-replicate.
They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, email, etc.
Removal
All Users:
Use current engine and DAT files for detection and removal.
Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).
But in some particular cases, the following steps need to be taken.
Please go to the Microsoft Recovery Console and restore a clean MBR.
On Windows XP:
- Insert the Windows XP CD into the CD-ROM drive and restart the computer.
- When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
- Select the Windows installation that is compromised and provide the administrator password.
- Issue 'fixmbr' command to restore the Master Boot Record
- Follow onscreen instructions.
- Reset and remove the CD from CD-ROM drive.
On Windows Vista and 7:
- Insert the Windows CD into the CD-ROM drive and restart the computer.
- Click on "Repair Your Computer".
- When the System Recovery Options dialog comes up, choose the Command Prompt.
- Issue 'bootrec /fixmbr' command to restore the Master Boot Record.
- Follow onscreen instructions.
- Reset and remove the CD from CD-ROM drive.
Variants