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
4688 (2006-02-02) Updated DAT4688 (2006-02-02) |
Minimum Engine
5.1.00 File Length32,797 |
Description Added
2006-02-02 Description Modified2006-02-08 |
Malware Proliferation
Characteristics
This trojan is a remote access trojan. There are several variants of this trojan, and the specific actions taken are decided by the hacker who uses this trojan. The description is a general guide. Newer variant requires the latest DATs for detection.
Upon execution, the trojan drops itself to
- C:\WINDOWS\system32\msoff.exe
- C:\documents and settings\%USER%\local settings\temp\jav2.tmp (dll file)
- C:\documents and settings\all users\documents\settings\desktop.ini
The trojan injects the dll file jav2.tmp to the process IExplore.exe and opens a random port. It also attempts to send the notification to mail.ru via e-mail.
Symptoms
- Unexpected smtp connections
- Presence of the mentioned files
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