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- From: rslade@sfu.ca
- Newsgroups: comp.virus
- Subject: CHRISTMA effects (CVP)
- Message-ID: <0020.9211161950.AA15221@barnabas.cert.org>
- Date: 15 Nov 92 01:52:16 GMT
- Sender: virus-l@lehigh.edu
- Lines: 56
- Approved: news@netnews.cc.lehigh.edu
-
- HISVIRI.CVP 921022
-
- CHRISTMA EXEC - the effects
-
- The exact number of copies made by any one reading of the CHRISTMA
- EXEC would depend upon the number of listings in the NAMES file, and
- the messages received by the NETLOG file. However, for all intents
- any nuclear physicist knows that it only needs to be, on average,
- "greater than one". The CHRISTMA EXEC would destroy itself, after
- having been read, but more copies would be created than destroyed.
-
- Some of the newly spawned messages would "die" a natural net death,
- being outdated accounts, or directed at those who were on holiday
- (or, perhaps, executives and managers, who, of course, never read
- their email :-). Most, however, would reach a working account, and
- a mildly (but likely not sufficiently) curious user. The user would
- type "Christmas", see the tree, shrug and dismiss the message ...
- while a number of new messages would be created and head off in all
- directions.
-
- Eventually, a large number of users would be reading, and
- inadvertantly sending, copies of the message. Therefore, a large
- volume of mail would be being generated, using up a large chunk of
- bandwidth. Eventually, in some cases, all the available bandwidth.
- Some machines were essentially cut off from the net ... with the
- exception of the CHRISTMA "cards".
-
- In addition to bandwidth, CHRISTMA consumed disk space. The
- individual messages would not be large, but the numbers of them
- would start to consume significant amounts of disk drive real
- estate. Mail spool entries would also be used up. Not only would
- they be used up on the system itself, but users' mail directories
- would start to show repeating listings for the CHRISTMA EXEC,
- crowding out other, more important messages. (Most of this crowding
- would be psychological, but occasionally it would be physical, as
- system limits were reached.)
-
- The general "disinfecting" action taken was to shut down the system,
- and purge all copies of the message from the mail spool. However,
- since the transmission was "cross-system", users would have to be
- warned to be on the alert for the message when received from an
- outside source. The major impact was mostly confined to the period
- of December 9th, 1987, to December 14th. IBM's internal network,
- VNET, was more heavily hit than either EARN or Bitnet, and drastic
- action, in the form of a general system shutdown, was felt to be
- needed to clear up the mess. (VNETers seemed to be more severely
- affected because of larger NAMES files.)
-
- copyright Robert M. Slade, 1992 HISVIRI.CVP 921022
-
- ==============
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