Name: AntiSkola.211 Category: Viruses Description: Details AntiSkola.2111 It is a dangerous memory resident parasitic virus. It hooks INT 9, 21h and writes itself to the end of COM and EXE files that are executed. While infecting the COMMAND.COM file the virus patches its code at fixed offset and writes JMP-Virus instruction to there. That does work only for some COMMAND.COM version(s) and corrupts COMMAND.COM from other DOSes (including Win95). On keystrokes (INT 9) depending on the system timer the virus changes the data in keyboard buffer. Depending on the system timer the virus stops executing the TURBO.EXE and TPX.EXE files. Also depending on the system time the virus decrypts and displays the message (see below), plays a tune and halts the computer: Dobry den,predstavuje se Vam virus AntiSkola.Tento virus byl napsan pro demonstraci idealniho preziti viru ve skolnim prostredi.Doufam, ze se Vam bude libit. Moje podekovani patri zejmena : Firme Borland International Inc. za TurboAssembler a TurboDebugger Skole za to,ze mi umoznila nerusene programovat Firme Microsoft za "operacni system" MS-DOS,ktery byl koncipovan primo pro viry.Na prikladu WINDOWS 95 je jasne videt,ze se stale teto filozofie nevzavaji.Mozna by si meli neco precist o protected modu a preemtivnim multitaskingu. At zije SOSE v Brne na Obranske !!