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THE CryPtLAB Virus: CRYPT.COM
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Cryptlab is a fast-acting, direct action, file-infecting virus
which utilizes time/date stamp retention and the
Dark Avenger's Mutation Engine for stealthiness.

Upon call, Cryptlab will infect multiple files
before exiting. Everytime Cryptlab is excuted
it will re-encrypt itself with a new key using the
Mutation Engine device.  Popular anti-viral scanners
like Norton Antivirus and Central Point Antivirus cannot
detect Cryptlab; however, Virex IS effective.

In addition to corrupting files, Cryptlab can overxor
a random sector of the disk every time it infects.

Experienced virus programmers will notice that Cryptlab
is a simple-minded modification of the Sara Gordon virus. This is
indeed so. However, while Sara Gordon virus would only infect
.COM files, Cryptlab will contaminate almost
everything. The rationale behind this is that
the Sara virus as simple, one directory .COM infector would 
run out files to infect rather quickly.  
This mitigates its nuisance potential. Since Crypt will append
itself to many types of files, the subroutine which writes trash
randomly to sectors on the infected disk will get significantly
more opportunity to work. Contaminated files will execute properly 
(in the case of .COM's), but most others will
probably behave strangely or crash themselves
or their parent.

Unencrypted copies of Cryptlab will have the following
text embedded in them: CRYPTLAB: THE SELECT CHOICE FOR YOUR
VIRUS & TROJAN RESEARCH NEEDS! -ERNST KOUCH.

You are welcome to modify or use the Cryptlab virus for 
any experimental need you see fit.
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CryPtLAB!