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Text File  |  1996-03-23  |  4KB  |  52 lines
  1. ┌─────────────────────────────────────────────────────────────────────────────┐
  2. │Undetectable Viruses                                                         │
  3. │By SIA [03-10-96]                                                            │
  4. │S#4-19a                                                                      │
  5. │                                                                             │
  6. │It's very clear that the virus scanners cannot keep up with the              │
  7. │new encryption programs which viruses are hidden.  For example,              │
  8. │novice users often just simply scan, and if the scanner says                 │
  9. │that there is nothing wrong with your file, he/she usually runs              │
  10. │the file, and without warning, a virus takes over a victim's                 │
  11. │hard drive.  What was wrong with that user's precaution techn-               │
  12. │iques?  Picture this, a state trooper tries to use his radar                 │
  13. │on high-speed sports cars, but his radar states that the car                 │
  14. │is not speeding, even though it is speeding.  Its the same way               │
  15. │with viruses, most viruses these days cannot be detected by                  │
  16. │even the most sophisticated virus scanners, here are the reasons             │
  17. │why:                                                                         │
  18. │                                                                             │
  19. │a. Batch file virus                                                          │
  20. │b. Compressed by LZEXE, PKLite, or other .EXE compressors.                   │
  21. │c. Encrypted by PROTECT or other .EXE encrypters.                            │
  22. │d. New signatures                                                            │
  23. │                                                                             │
  24. │Batch file viruses are rarely seen these days, but they do exist,            │
  25. │some batch viruses have been converted into .EXE and .COM files,             │
  26. │the safest way to detect these kinds of viruses is by using a                │
  27. │hex editor or even a plain text editor for .BAT files.                       │
  28. │                                                                             │
  29. │Compressed executable files which contains virus signatures can              │
  30. │hardly be detected, since the whole .EXE file is compressed and              │
  31. │some of the coding becomes "static" to your virus scanner, one               │
  32. │safe way of detecting viruses off compressed executables is by               │
  33. │using an decompressor, such as UNP.                                          │
  34. │                                                                             │
  35. │Encrypted virus executable files has also the same effect as                 │
  36. │compressed virus executables, SIA suggests UNP's sophisticated               │
  37. │techniques of decrypting and decompressing these files, and then             │
  38. │run your favorite virus scanner.                                             │
  39. │                                                                             │
  40. │Most of the new virus scanner products can detect new virus                  │
  41. │signatures, though be warned, not all virus scanners are perfect.            │
  42. │Always look for the most up-to-date virus scanner data(s) for                │
  43. │your virus scanner.  Sometimes, upgrades cost from nothing to                │
  44. │$30.  It's better to be safe, than demolished.                               │
  45. │                                                                             │
  46. │***                                                                          │
  47. │                                                                             │
  48. │SIA is a non-profit organization outlined to provide the normal              │
  49. │computer users with information concerning illegal activities                │
  50. │and the dangers of cyberspace.                                               │
  51. └─────────────────────────────────────────────────────────────────────────────┘
  52.