Trojan.BAT.Stupid

Parent class: TrojWare

Trojans are malicious programs that perform actions which are not authorized by the user: they delete, block, modify or copy data, and they disrupt the performance of computers or computer networks. Unlike viruses and worms, the threats that fall into this category are unable to make copies of themselves or self-replicate. Trojans are classified according to the type of action they perform on an infected computer.

Class: Trojan

A malicious program designed to electronically spy on the user’s activities (intercept keyboard input, take screenshots, capture a list of active applications, etc.). The collected information is sent to the cybercriminal by various means, including email, FTP, and HTTP (by sending data in a request).

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Platform: BAT

No platform description

Description

Technical Details

This Trojan has a malicious payload. It is a BAT file. It is 246 bytes in size.

Payload

When launched the Trojan will delete the following file:

It will replace it with the following file:

which contains the following code:

The result is that when "scandisk" is called, an attempt will be made to format C: without displaying a warning.

Removal instructions

If your computer does not have an up-to-date antivirus, or does not have an antivirus solution at all, follow the instructions below to delete the malicious program:

1. Delete the original Trojan file (the location will depend on how the program originally penetrated the victim machine).
2. Delete the file created by the Trojan:
   C:windowscommandscandisk.bat
3. Restore the file which the Trojan deleted from backup:
   C:windowscommandscandisk.exe
4. Update your antivirus databases and perform a full scan of the computer (download a trial version of Kaspersky Anti-Virus).

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