Threat Description

Cri-Cri

Details

Category: Malware
Type: Virus
Platform: W32

Summary



This virus is polymorphic full-stealth infected of COM and EXE files and floppy disk bootsectors.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details



Although the decryptor is polymorphic, the encryption used is simple xor with a variable key. Filesize increase is constant (4616 bytes).

Floppy boot sectors are infected whenever floppies accessed. Virus writes it's own code to the end of the floppy disk, original bootsector is relocated to the end of the root directory.

Cri-Cri infects files between approximately the sizes of 10000 and 60000 bytes.

The virus allocates 10kb of RAM while resident.

Cri-Cri activates on the 4th of June displaying this text in green color to the middle of the screen:

     Cri-Cri ViRuS by Griyo96 ...tried, tested, not approved

Cri-Cri is written by the Spanish 29A virus group.

This virus was found in November 1996 on S3-Trio64 Chinese Windows 3.1 setup disks.





Technical Details: Peter (cvc@geko.net.au), Australian F-Secure Support


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