Virus.Win9x.Shoerec

Parent class: VirWare

Viruses and worms are malicious programs that self-replicate on computers or via computer networks without the user being aware; each subsequent copy of such malicious programs is also able to self-replicate. Malicious programs which spread via networks or infect remote machines when commanded to do so by the “owner” (e.g. Backdoors) or programs that create multiple copies that are unable to self-replicate are not part of the Viruses and Worms subclass. The main characteristic used to determine whether or not a program is classified as a separate behaviour within the Viruses and Worms subclass is how the program propagates (i.e. how the malicious program spreads copies of itself via local or network resources.) Most known worms are spread as files sent as email attachments, via a link to a web or FTP resource, via a link sent in an ICQ or IRC message, via P2P file sharing networks etc. Some worms spread as network packets; these directly penetrate the computer memory, and the worm code is then activated. Worms use the following techniques to penetrate remote computers and launch copies of themselves: social engineering (for example, an email message suggesting the user opens an attached file), exploiting network configuration errors (such as copying to a fully accessible disk), and exploiting loopholes in operating system and application security. Viruses can be divided in accordance with the method used to infect a computer:

• file viruses
• boot sector viruses
• macro viruses
• script viruses

Any program within this subclass can have additional Trojan functions. It should also be noted that many worms use more than one method in order to spread copies via networks.

Class: Virus

Viruses replicate on the resources of the local machine. Unlike worms, viruses do not use network services to propagate or penetrate other computers. A copy of a virus will reach remote computers only if the infected object is, for some reason unrelated to the virus function, activated on another computer. For example: when infecting accessible disks, a virus penetrates a file located on a network resource a virus copies itself to a removable storage device or infects a file on a removable device a user sends an email with an infected attachment.

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Platform: Win9x

No platform description

Description

Technical Details

This is a very dangerous encrypted parasitic Win95 virus about 10Kb in length. It is a direct action virus - it scans current a drive directory three times, looks for PE EXE files there and infects them; but it does it in the background of a host process (in process thread), and as a result, can stay in memory for a long time up to the moment the host process is terminated, or all files on a drive are scanned. Because of this, the virus can be classified as per-process memory resident.

While infecting a file, the virus writes itself to the end of the file in the last file section, increases this section size and modifies necessary PE header fields.

To obtain addresses for file access and other functions, the virus uses an address that is valid for Win95/98 only, and as a result, causes standard a Windows "error in application" message when infected files are run under other Windows versions.

In about 4 month after infecting a file, and being run on the same computer (the virus stores the current date and computer name while infecting), the virus runs its trigger routine. This routine gains access to a Windows desktop, and moves icons out of the mouse cursor when the mouse cursor is being moved to the icons. It appears as though the programs' icons run out away from the cursor, trying to escape.

When the files are infected on the 1st, 2nd or 3rd of any month, the virus randomly infects them with its Trojan routine. When such Trojanized files are run in about 7 months after being infected, the Trojan routine erases all files on the current drive, creates and randomly overwrites the WIN.COM file with garbage or the text:

 (c) 1999 Brain & Amjads (pvt) Ltd   
 VIRUS_SHOE  RECORD  v20.0
 Dedicated to the dynamic memories of millions of virus 
 who are no longer with us today - Thanks

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