rtfraptor：从恶意RTF文件中提取OLEv1对象的工具

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rtfraptor：从恶意RTF文件中提取OLEv1对象的工具

2019 年 2 月 13 日 FreeBuf

介绍

rtfraptor是一个简单的工具，通过提取OLEv1对象分析恶意RTF文件。它的工作原理是运行Word并拦截对OLEv1函数的调用。从内存中转储原始OLE对象以进行进一步分析。这个工具有以下优点：

1.避免手动分析混淆的RTF文件。

2.提取恶意对象（打包程序对象，公式编辑器滥用，嵌入式文档等）。

3.确定RTF文档试图滥用的漏洞（或功能）。

4.验证其他工具的输出（例如静态文档解析器）。

安装

$ pip install rtfraptor这将自动获取并安装依赖项。建议在虚拟环境中安装。

用法

至少需要传递--executable和--file参数，如下所示：

(analysis_venv) > rtfraptor --executable "C:\Program Files\Microsoft Office\Office15\WINWORD.EXE" --file 7296D52E0713F4BF15CD4E80EF0DA37E.rtf

要保存JSON输出并将原始OLEv1对象转储到磁盘，请传递以下选项：--json output.json --save-path ole_parts注意：此工具运行Word。应该在虚拟机内部分析可疑文档。该工具不会停止执行任何payload，将虚拟机与任何网络隔离。

输出

原始对象输出

可以使用--save-path选项存储原始OLEv1对象。下面是一个包含可移植可执行文件的Packager对象示例。

00000000  01 05 00 00 02 00 00 00 08 00 00 00 50 61 63 6b  |............Pack|
00000010  61 67 65 00 00 00 00 00 00 00 00 00 fe 12 00 00  |age.........þ...|
00000020  02 00 63 72 6f 73 73 61 61 61 2e 64 6c 6c 00 43  |..crossaaa.dll.C|
00000030  3a 5c 63 72 6f 73 73 61 61 61 2e 64 6c 6c 00 00  |:\crossaaa.dll..|
00000040  00 03 00 31 00 00 00 43 3a 5c 55 73 65 72 73 5c  |...1...C:\Users\|
00000050  52 65 76 65 72 73 65 5c 41 70 70 44 61 74 61 5c  |Reverse\AppData\|
00000060  4c 6f 63 61 6c 5c 54 65 6d 70 5c 63 72 6f 73 73  |Local\Temp\cross|
00000070  61 61 61 2e 64 6c 6c 00 00 12 00 00 4d 5a 90 00  |aaa.dll.....MZ..|
00000080  03 00 00 00 04 00 00 00 ff ff 00 00 b8 00 00 00  |........ÿÿ..¸...|
00000090  00 00 00 00 40 00 00 00 00 00 00 00 00 00 00 00  |....@...........|
000000a0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  |................|
000000b0  00 00 00 00 00 00 00 00 d8 00 00 00 0e 1f ba 0e  |........Ø.....º.|
000000c0  00 b4 09 cd 21 b8 01 4c cd 21 54 68 69 73 20 70  |.´.Í!¸.LÍ!This p|
000000d0  72 6f 67 72 61 6d 20 63 61 6e 6e 6f 74 20 62 65  |rogram cannot be|
000000e0  20 72 75 6e 20 69 6e 20 44 4f 53 20 6d 6f 64 65  | run in DOS mode|
... snip ...

命令行输出

生成控制台输出，列出所有可疑的OLE对象（oletools.common.clsid中的对象）：

(analysis_venv) > rtfraptor --executable "C:\Program Files\Microsoft Office\Office15\WINWORD.EXE" --file 7296D52E0713F4BF15CD4E80EF0DA37E.rtf --json output.json --save-path ole_parts
WARNING Suspicious OLE object loaded, class id 00020821-0000-0000-C000-000000000046 (Microsoft Excel.Chart.8)
WARNING Object size is 390702, SHA256 is 2a7f92bf37cef77c4fa2e97fcf3478b3e4e4296514817bd8c12e58300b485406
WARNING Suspicious OLE object loaded, class id 00020821-0000-0000-C000-000000000046 (Microsoft Excel.Chart.8)
WARNING Object size is 390190, SHA256 is f8ac5b37f52b6316178c293704fcc762d0a29d2700c7eda53724f552413c7b98
WARNING Suspicious OLE object loaded, class id F20DA720-C02F-11CE-927B-0800095AE340 (OLE Package Object (may contain and run any file))
WARNING Object size is 359115, SHA256 is 2ea248d43d4bd53e234530db0de2517a7f44deba5f43367636232019b2e9e822
WARNING Suspicious OLE object loaded, class id F20DA720-C02F-11CE-927B-0800095AE340 (OLE Package Object (may contain and run any file))
WARNING Object size is 4902, SHA256 is 28c9afbe46a35a6d7115ca3da535854efddc9749f1ff13722fa98d2bd3a8122b
WARNING Suspicious OLE object loaded, class id F20DA720-C02F-11CE-927B-0800095AE340 (OLE Package Object (may contain and run any file))
WARNING Object size is 5926, SHA256 is 5b5850f3217e8465d6add2da18a495d87d33552c6c8f400e52e5ab9cf06ba2e9
WARNING Suspicious OLE object loaded, class id 0002CE02-0000-0000-C000-000000000046 (Microsoft Equation 3.0 (Known Related to CVE-2017-11882 or CVE-2018-0802))
WARNING Object size is 7727, SHA256 is 38d9e74ede4ef67e78e028ecd815c54a777e11c6c4e7838ecbe26fd7e7c03d7c
WARNING Suspicious OLE object loaded, class id 0002CE02-0000-0000-C000-000000000046 (Microsoft Equation 3.0 (Known Related to CVE-2017-11882 or CVE-2018-0802))
WARNING Object size is 7727, SHA256 is a612b7b97f021797c5911cfe02bd9a145f96abb880990830eaf021f98a4a7c8a

json输出

如果传递了--json选项，该工具将以JSON格式生成输出,以下格式：

{
  "sha256": "8326bcb300389a2d654e6e921e259e553f33f8949984c2da55ccb6e9ed3f6480",
  "input_file": "7296D52E0713F4BF15CD4E80EF0DA37E.rtf",
  "objects": {
    "0": {
      "class_id": "00020821-0000-0000-C000-000000000046",
      "sha256": "2a7f92bf37cef77c4fa2e97fcf3478b3e4e4296514817bd8c12e58300b485406",
      "description": "Microsoft Excel.Chart.8",
      "size": 390702
    },
    ... snip ...
    "2": {
      "class_id": "F20DA720-C02F-11CE-927B-0800095AE340",
      "sha256": "2ea248d43d4bd53e234530db0de2517a7f44deba5f43367636232019b2e9e822",
      "description": "OLE Package Object (may contain and run any file)",
      "size": 359115
    },
    ... snip ...
    "5": {
      "class_id": "0002CE02-0000-0000-C000-000000000046",
      "sha256": "38d9e74ede4ef67e78e028ecd815c54a777e11c6c4e7838ecbe26fd7e7c03d7c",
      "description": "Microsoft Equation 3.0 (Known Related to CVE-2017-11882 or CVE-2018-0802)",
      "size": 7727
    },
    ... snip ...
}

*参考来源：github，由周大涛编译，转载请注明来自FreeBuf.COM