Virus Name: Zy Virus Type: File Infector Virus (infects .COM files) Virus Length: 463 Bytes(COM)
PC Vectors Hooked: None Executing Procedure: 1) Searches for and infects one uninfected .COM file in the current directory. 2) It finally executes the originally called file. Damage: None Detecting Method: 1)Infected files will increase by 463 Bytes. Note: 1) Doesn't stay resident in memory. 2) ZY doesn't hook INT 24h when infecting files. Error message occurs if there is an I/O error (such as write protect).
Virus Name: ZEPPELIN Virus Type: File Infector Virus (infects .COM & .EXE files) Virus Length: 1508 Bytes(COM & EXE)
PC Vectors Hooked: INT 24h Executing Procedure: 1) Searches for and infects 4 uninfected .EXE or .COM files in the current directory.2) It then shows a lot of uncertain codes, makes sounds, and then the system halts. Detecting Method: 1)Infected files will increase by 1508 Bytes. 2) A lot of codes appear on the screen.
Note: 1) Doesn't stay resident in memory. 2) Zeppelin hooks INT 24h when infecting files. Omits an I/O error (such as write protect).
Virus Name: Zz1 Virus Type: Overwrite, COM File infector Virus Length: 127 bytes Executing Procedure: 1) Searches for an uninfected COM file on the current directory and infects it (Infects only one file at a time). 2) If there is not an infectable file, it changes data in system RAM to set screen lines to 81. This confuses the screen. Damage: 1) It overwrites first 127 bytes of original files by virus code. Original files are destroyed. 2) Confuses screen if there are no infectable files. Note: Date and time of infected files do not change.