病毒的逻辑一简单的和压缩的 连不女 15 program V:= goto main: program CV:= 1234567: {goto main; subroutine infect-executable : 01234567; {1o0p: file:=get-random-executable-file; subroutine infect-executable : if (first-line-of-file =1234567) {loop: then goto loop file :get-random-executable-file; else prepend V to file; if(first-line-of-file =01234567)then goto loop; (1 compress file; subroutine do-damage : (2) prepend CV to file; [whatever damage is to be done subroutine trigger-pulled : freturn true if some condition holds) main: main-program : {if ask-permission then infect-executable; main: main-program : (3) uncompress rest-of-file; finfect-executable; (4) run uncompressed file; if trigger-pulled then do-damage; goto next; Figure 19.2 Logic for a Compression Virus next: } Figure 19.2 A Simple Virus 2022/10/9 现代密码学理论与实践-19：恶意软件 8/412022/10/9 现代密码学理论与实践-19：恶意软件 8/41 病毒的逻辑－简单的和压缩的 program CV := {goto main; 01234567; subroutine infect-executable := {loop: file := get-random-executable-file; if (first-line-of-file = 01234567) then goto loop; (1) compress file; (2) prepend CV to file; } main: main-program := {if ask-permission then infect-executable; (3) uncompress rest-of-file; (4) run uncompressed file;} } Figure 19.2 Logic for a Compression Virus