WannaCry勒索软件分析

2017-5-14 Nie.Meining Debug

大家都知道,昨天WannaCry勒索软件在一夜之间利用系统漏洞席卷全球,特别是在内网和专网中,通过攻击445端口(蠕虫性质)大肆传播,造成了巨大数据损失。我也凑个热闹,找到一批样本上传金刚分析系统(http://tcasoft.com/),看看效果。

其中比较典型的分为两类,一类就是昨天大家新闻中看到的,访问某个超长的域名,如果存在就放弃攻击。如图:

2.png

1.png

其实这个“域名开关”并不完全可以保平安。还有一类样本一上来就搞破坏,并不会探测域名。如某样本的分析报告:

http://tcasoft.com/tcaCloudPlatform/report/toViewReport.action?rid=22bfa9109ab9d405af4188867620c730&sk=60036875

下面对该报告简单解读。

首先观察运行过程截图可以看出,样本执行初期没有任何引人注意的表现,当桌面被替换、前台弹出提示信息时,一切都为时已晚,用户的文件就已经被加密,要想恢复文件内容只能向攻击者提供的地址汇入300美元比特币了。如下图所示。

3.png

4.jpg


观察行为列表可以看到,样本释放了大量可执行程序以及bat、vbs等恶意脚本,并借助这些程序、脚本和Windows自带的系统工具共同完成攻击目的。例如通过attrib系统工具实现自我隐藏、利用icacls工具获取文件操作权限、利用vssadmin工具破坏系统还原功能、利用reg程序导入注册表实现自启动等。如下图所示。

5.png

6.png

7.png


一切就绪后,样本开始重头戏——文件加密。在行为列表中可以看到大量与文件操作相关的行为,包括修改文件属性、读写文件、修改文件创建时间、文件重命名等。这些正是WannaCry对用户文件进行加密的详细过程。如下图所示。

8.png


进一步观察样本的详细行为数据可以发现,攻击者其实会针对每个文件生成一个扩展名为WNCRYT的临时文件,在加密完成并设置好文件创建时间后,会将该临时文件重命名为WNCRY文件。如下图所示。

9.png


具体这些被加密后的文件长什么样呢?只需查看分析报告里的“中间文件”就可以看到。如下图所示,攻击者感兴趣的文件主要包括doc、xls、jpg等各种文档和图片,被加密后文件头部均变成了“WANACRY!”标识。

a.png


除了以上主机破坏行为以外,样本运行过程中还能观测到大量的网络行为,连接地址包括美国、德国、奥地利等多个国家,同时会尝试连接一个很长的域名。如图所示。

b.png

c.png


由于金刚系统在分析过程中,引擎并未连接真实互联网,因此网络行为我就没有展开分析了。其实该样本还有不少技术细节上文并未展开介绍,大家若有兴趣欢迎查看分析报告自行研究。

评论:

Henrynib
约 1 小时前
Anche un bambino sa come fare $ 100 oggi con l'aiuto di questo robot.
Link - https://moneylinks.page.link/6SuK
Henrynib
约 7 小时前
Un dollaro non è niente, ma può crescere in $100 qui.
Link - - http://www.google.com/url?q=%68%74%74%70%3A%2F%2F%74%65%73%74%77%6f%72%6b%73%2e%77%65%62%73%69%74%65%23%5a%45%72%51%6a%4b%58%75%44%65%58%55%70%6d%67%66&sa=D&sntz=1&usg=AFQjCNHFlb3nwTRow05qpQ1eM7S_M0UIZg
Henrynib
2020-10-22 07:14
Il robot finanziario è lo strumento finanziario più efficace in rete!
Link - http://www.google.com/url?q=%68%74%74%70%3A%2F%2F%72%65%69%64%61%69%66%6f%73%74%69%68%69%6e%2e%6d%6c%23%4d%63%62%52%4b%57%6e%69%5a%46%63%4d%66%46%6e&sa=D&sntz=1&usg=AFQjCNH_GC344jkFAjApIlTE7uB8TxMdBA
Henrynib
2020-10-21 18:22
Inizia a fare migliaia di dollari ogni settimana usando questo robot.
Link - http://www.google.com/url?q=%68%74%74%70%3A%2F%2F%72%65%69%64%61%69%66%6f%73%74%69%68%69%6e%2e%6d%6c%23%4f%41%53%4f%4f%79%51%58%65%6c%4f%4f%47%77%41&sa=D&sntz=1&usg=AFQjCNFkzPnyANY4UX270ccY8zh2YA1tcg
Henrynib
2020-10-20 06:15
Scopri il nuovo strumento finanziario, che può farti ricco.
Link - - https://moneylinks.page.link/6SuK
Henrynib
2020-10-19 12:10
Un clic del robot può portare migliaia di dollari.
Link - http://www.google.com/url?q=%68%74%74%70%73%3A%2F%2F%68%64%72%65%64%74%75%62%65%33%2e%6d%6f%62%69%2F%62%74%73%6d%61%72%74%23%64%72%6b%72%62%4a%48%55%78%76%57%53%4d%6a%7a%51%64&sa=D&sntz=1&usg=AFQjCNHkuEB6QK0z_x_klABMhWaQ5iHYxA
Henrynib
2020-10-19 11:56
Il robot finanziario è lo strumento finanziario più efficace in rete!
Link - http://www.google.com/url?q=%68%74%74%70%73%3A%2F%2F%68%64%72%65%64%74%75%62%65%33%2e%6d%6f%62%69%2F%62%74%73%6d%61%72%74%23%6d%53%72%71%46%69%75%6b%4a%63%76%7a%55%54%4d%58%6d&sa=D&sntz=1&usg=AFQjCNH8MXe6VtrNLWL1Mh37MZaeaRVggA
Henrynib
2020-10-19 06:55
Ancora non un milionario? Il robot finanziario vi farà lui!
Link - http://www.google.com/url?q=%68%74%74%70%73%3A%2F%2F%68%64%72%65%64%74%75%62%65%33%2e%6d%6f%62%69%2F%62%74%73%6d%61%72%74%23%68%55%42%77%62%50%7a%73%53%6a%77%6f%76%6c%78%50%76&sa=D&sntz=1&usg=AFQjCNH6GujmnruTBh8_nfO61CriNxin0w
Henrynib
2020-10-19 06:46
Il miglior lavoro online per i pensionati. Rendi ricchi i tuoi vecchi tempi.
Link - http://www.google.com/url?q=%68%74%74%70%73%3A%2F%2F%68%64%72%65%64%74%75%62%65%33%2e%6d%6f%62%69%2F%62%74%73%6d%61%72%74%23%74%64%6d%51%67%67%4a%44%77%61%4b%55%53%6a%74%43%76&sa=D&sntz=1&usg=AFQjCNHYA576Dh-wSEUFo1Auj43XYRLVog
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