112 lines
5.2 KiB
Plaintext
112 lines
5.2 KiB
Plaintext
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<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ
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<20> VIRUS REPORT <20>
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<20> Cascade Virus <20>
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<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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Synonyms: 1701, Falling Letters, Falling Tears, Fall virus, Autumn
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Leaves.
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Date of Origin: late 1987.
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Place of Origin: Switzerland?
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Host Machine: The 1701 version will infect both true IBM PC's and PC
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compatibles; the 1704 version will only affect PC compatibles. This is
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the only difference between the two versions.
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Host Files: Remains resident. Infects COM files. Uses self-encryption.
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OnScreen Symptoms: If the system month is between September and
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December, and the system year is either 1980 or 1988, and the monitor is
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either CGA or VGA, the cascade display will be activated at random
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intervals.
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Increase in Size of Infected Files: 1701 or 1704 bytes (two different
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versions).
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Nature of Damage: Affects system run-time operation. Corrupts program or
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overlay files.
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Detected by: Scanv56+, F-Prot, IBM Scan, Pro-Scan.
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Removed by: M-1704, CleanUp, or F-Prot. You may also follow the
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instructions for removing the Jerusalem virus.
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Derived from: A NumLock utility Trojan horse.
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Scan Code: Uses self-encryption. FA 8B EC E8 00 00 5B 81 EB 31 01 2E F6
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87 2A 01 01 74 0F 8D B7 4D 01 BC 82 06 31 34 31 24 46 4C 75 F8. You can
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also search at offset 01BH for 31 34 31 24 46 4C 75 F8.
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This virus was adapted from a Trojan utility which was claimed to
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turn of the Num Lock light and mode. The Trojan caused characters on CGA
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screens to "fall" to the bottom of the screen. In late 1987 this Trojan
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was turned into a memory resident COM virus, and reported by Rudolf
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Rindler of Switzerland.
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Two version of the virus exist.
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* The 1701 version increases the size of COM files by 1,701 bytes, and
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infect both machines containing an IBM copyright notice in the ROM
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and clones.
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* The 1704 version increases the size of COM files by 1,704 bytes, and
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infects only clones.
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The virus occurs attached to the end of a COM file. The first three
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bytes of the program are stored in the virus, and replaced by a branch to
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the beginning of the virus. It becomes memory-resident when the first
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infected program is run, and it will then infect every COM file run (even
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if the file has an EXE extension).
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The virus is unique in several ways:
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* The virus is encrypted (apart from the first 35 bytes) using an
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algorithm that includes the length of the host program, so every
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sample looks different.
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* The mechanics of its activation are complex, being based on
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randomizations, machine types, monitor type, presence or absence of
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clock cards, and time of year. The virus activates on any machine
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with a CGA or VGA monitor, in the months of September, October,
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November or December, in the year 1980 or 1988 (systems without clock
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cards will often have a date set to 1980).
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* Occasionally, 1701 triggers a "hailstorm". The characters on the
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screen behave as if the were pinned to the screen, and someone is
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removing the pins one at a time <197> it looks a bit like a hailstorm,
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and has appropriate sound effects. In fact, it is a purely
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audio-visual effect - nothing is happening to your data. But over
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-reaction at this point -- turning the machine off -- may result in
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lost clusters and file damage.
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To remove the virus, either run M-1704 or follow the instructions
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offered for the Jerusalem virus.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͻ
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<EFBFBD> This document was adapted from the book "Computer Viruses", <20>
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<EFBFBD> which is copyright and distributed by the National Computer <20>
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<EFBFBD> Security Association. It contains information compiled from <20>
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<EFBFBD> many sources. To the best of our knowledge, all information <20>
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<EFBFBD> presented here is accurate. <20>
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<EFBFBD> <20>
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<EFBFBD> Please send any updates or corrections to the NCSA, Suite 309, <20>
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<EFBFBD> 4401-A Connecticut Ave NW, Washington, DC 20008. Or call our BBS <20>
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<EFBFBD> and upload the information: (202) 364-1304. Or call us voice at <20>
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<EFBFBD> (202) 364-8252. This version was produced May 22, 1990. <20>
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<EFBFBD> <20>
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<EFBFBD> The NCSA is a non-profit organization dedicated to improving <20>
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<EFBFBD> computer security. Membership in the association is just $45 per <20>
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<EFBFBD> year. Copies of the book "Computer Viruses", which provides <20>
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<EFBFBD> detailed information on over 145 viruses, can be obtained from <20>
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<EFBFBD> the NCSA. Member price: $44; non-member price: $55. <20>
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<EFBFBD> <20>
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<EFBFBD> The document is copyright (c) 1990 NCSA. <20>
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<EFBFBD> <20>
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<EFBFBD> This document may be distributed in any format, providing <20>
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<EFBFBD> this message is not removed or altered. <20>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ
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Downloaded From P-80 International Information Systems 304-744-2253
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