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
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.Read more
Platform: MSOffice
Microsoft Office is a multiplatform suite of productivity applications published by Microsoft. Office applications are compatible with many types of files and content.Description
Technical Details
These are multi-platform macro-viruses infecting Office97 components: Word documents and Excel sheets. The viruses contain two auto-macros in Excel sheets and Word documents: Document_Close and Workbook_Deactivate.
The viruses replicate themselves in Excel upon deactivating workbooks. In Word, the viruses replicate upon document closing. The minor virus version spreads only from Excel to Word and not back, and the major virus version migrates from Word to Excel and back with no problems.
The viruses turn off the VirusProtection MS Office option. Depending on the version, the viruses contain the the following text comments or display them in MessageBox:
Ex-cell v0.1 /1nternal Cross.BadSeed v0.1 /1nternal Cross.BadSeed v0.2 /1nternal Cross.BadSeed v0.3 /1nternal Cross.BadSeed v0.4 /1nternal
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