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- *** Reports collected and collated by ***
- *** PC-Virus Index ***
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- *** to the authors ***
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-
- ===== Computer Virus Catalog 1.2: "Lisbon Virus" (5-June-1989) ======
-
- Entry...............: "Lisbon" Virus
- Alias(es)...........: ---
- Virus strain........: Vienna Virus strain
- Virus detected when.: ---
- where.: ---
- Classification......: Program virus (extending), direct action
- Length of virus.....: 648 bytes
-
- --------------------- Preconditions ----------------------------------
-
- Operating system(s).: MS-DOS
- Version/release.....: 2.0 and higher
- Computer model(s)...: All MS-DOS machines
-
- --------------------- Attributes -------------------------------------
-
- Easy identification.: Last five bytes of file = "@AIDS" (Ascii)
-
- Type of infection...: Self-Identification: The time stamp of an
- infected file is changed: the seconds are
- set to 62 (= 2 * 1Fh).
- When infected file is executed, .COM-files
- in the current directory as well as in the
- directories in the DOS-PATH are extended by
- appending the viral code; no infection if
- the file size<10 or file size>64000 bytes.
-
- Infection trigger...: A selected .COM-file is infected by "random" IF
- (system seconds AND 58h) <> 0 ELSE damaged!
-
- Storage media affected: Current media and media accessed via DOS-PATH.
-
- Interrupts hooked...: --
-
- Damage..............: A selected .COM-file is damaged permanently:
- Overwriting the first five bytes by "@AIDS"
-
- Damage trigger......: IF (system seconds AND 58h) = 0, ELSE infection!
-
- Particularities.....: The virus ignores READ-ONLY and HIDDEN
- attributes.
-
- Similarities........: Dissimilarities to Vienna:
- Different trigger byte (7);
- the five damage bytes are changed.
-
- --------------------- Agents -----------------------------------------
-
- Countermeasures.....: Category 3: ANTI!LIS.EXE (d:) (/f)
-
- Countermeasures successful: My Antivirus ANTI!LIS.EXE looks for
- infected files on a given drive (d:) and
- optionally removes the virus (if /f given).
-
- Standard means......: ---
-
- --------------------- Acknowledgement -------------------------------
-
- Location............: Virus Test Center, University Hamburg, FRG
- Classification by...: Daniel Loeffler
- Documentation by....: Daniel Loeffler
- Date................: June 5, 1990
- Information Source..: ---
-
-
- ===================== End of "Lisbon"-Virus =========================
-
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