Eng
  1. Skip to navigation
  2. Skip to content
  3. Skip to sidebar


Cruncher


Aliases:


Cruncher

Malware
Virus
W32

Summary

Cruncher is an unordinary virus; it stays resident in memory and infects files normally, when they are executed. In addition to this, it finally applies a self-extracting packing layer on the infected files, packing both the original code and the appended virus code.

This makes the virus more difficult to detect, especially since the packing code is stolen from the freeware DIET packer, which is similar to LZEXE and PKLITE. For this reason, several antivirus programs have had a false alarm of Cruncher in clean DIET-packed programs.

Cruncher is also the only known virus which actually saves disk space, since infected programs are usually decreased in size by 20-40%.

There are two known variants of Cruncher, V1.0 infects COM files and V2.0 infects EXE files.

Cruncher was written in 1993 by 'Masud Khafir' of the TridenT virus group.

F-Secure anti-virus products might detect Cruncher-infected files as 'possibly a DIET-packed dropper of Coffeeshop'.



Disinfection & Removal

Automatic Disinfection

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

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







Description Created: Mikko Hypponen, F-Secure



Submit a sample




Wondering if a file or URL is malicious? Submit a sample to our Lab for analysis via the Sample Analysis System (SAS)

Give And Get Advice




Give advice. Get advice. Share the knowledge on our free discussion forum.