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Additional Analysis/Neutrino/Analysis_2020-02-08.md
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<h2>Malware analysis <a name="Malware-analysis"></a></h2>
<h3>The initial vector<a name="Initial"></a></h3>
<h6>The initial vector is an RTF file who use a well-know vulnerability (CVE-2017-11882) for execute a js script (1.a) form the package of OLE objects.</h6>
<h6>The initial vector is an malicious document using a macro. As the first look, we can note some constant variables can be replace and deletefor improvement the reading of the code.</h6>
``` VBA
Private Const HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHOneMask = 16515072
Private Const HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHTwoMask = 258048
Private Const HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHThreeMask = 4032
Private Const HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHFourMask = 63
Private Const HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHighMask = 16711680
Private Const HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHMidMask = 65280
Private Const HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHLowMask = 255
Private Const MNAJSAQQQQQQ18 = 262144
Private Const MNAJSAQQQQQQ12 = 4096
Private Const MNAJSAQQQQQQ6 = 64
Private Const MNAJSAQQQQQQ8 = 256
Private Const MNAJSAQQQQQQ16 = 65536
```
<h6> We can see the both functions for auto-open the macro in the reading of the document for the Word and Excel document. This is for a common code for the both vectors or for reduce the rate of the detection, hard to say it.</h6>
``` VBA
Sub AutoOpen()
AddSpace
End Sub
Private Sub Workbook_Open()
AddSpace
End Sub
```
</li>
<p align="center">
<img src="">
</p>
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* [impor.doc](https://app.any.run/tasks/454fe6a2-e2d0-4fa3-ba1d-78e2c7372ddd)
<h6> Resources : </h6><a name="Ressources"></a>
* [Encode64 / Decode64 in VB.NET](https://stackoverflow.com/questions/12879661/encode64-decode64-in-vb-net)
* [New Neutrino Bot comes in a protective loader](https://blog.malwarebytes.com/threat-analysis/2017/02/new-neutrino-bot-comes-in-a-protective-loader/)
* [URLhaus Neutrino](https://urlhaus.abuse.ch/browse/tag/Neutrino/)
* [VB2019 paper: Rich Headers: leveraging this mysterious artifact of the PE format](https://www.virusbulletin.com/virusbulletin/2020/01/vb2019-paper-rich-headers-leveraging-mysterious-artifact-pe-format/)