Uploader-D.a

This page shows details and results of our analysis on the malware Uploader-D.a

Download Current DAT: 6615

Threat Detail

Malware Type: Trojan

Malware Sub-type: Uploader

Discovery Date: 2003-03-20

Next Steps:

Overview
Characteristics
Symptoms
Method of Infection
Removal

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.

Minimum DAT

4254 (2003-03-26)

Updated DAT

4255 (2003-04-02)

Minimum Engine

5.1.00

File Length

205,824 bytes

Description Added

2003-03-20

Description Modified

2003-03-26

Malware Proliferation

Characteristics

This uploader trojan may arrive in an email message, which is detected as Exploit-MIME.gen.exe. On an unpatched system, the file will run automatically. This message is not created by the trojan, but is likely created by the trojan author and SPAMed to unsuspecting users.

Once run, the trojan searches the victim machine for DOC files to send out to two pre-set email addresses. Using its own SMTP engine, it sends the email through an SMTP server spcified within the trojan executable.

Once the trojan is done, it removes itself from memory. The trojan also does not copy itself locally, and it does not create entries in the registry or INI files to run again upon startup.

Symptoms

Receiving an email which has a file which runs automatically (In samples received by AVERT, the file was named "Support.bat" but this could be changed by the person sending the trojan)

Unexpected network traffic

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, 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.