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# RedAlert

### 01. Introduction

> An Android malware sample called "RedAlert" was found in the wild. The malware is known to collect data from infected phones and turns them to a remote controlled bots. You have to find out the address of the Command & Control (CC) server of the bots.

* Download the APK sample. (PW: **infected**)
* Extract the APK (apktool or jadx-gui)
* Analyze the resources

Your goal is

* to Extract the Android Package,
* Check the Android Permission (Check if it can intercept and write SMS messages)
* Find the CC server address (Protocol,IP, Port) in the resource files

APK File:

{% embed url="<https://www.dropbox.com/s/hi5l559ad1cna2r/red_alert.zip?dl=0>" %}

### 02. Analysis

The permissions are stored in the manifest.xml file of the apk package. I’ll use the aapt tool to dump the permissions.

```
aapt dump permissions RedAlert.apk
```

Just a short check about the permissions looks very dangerous. The package can read and write sms messages:

<div align="left"><img src="/files/lMT8b1AELqAZYTRjTcnU" alt=""></div>

Let's compare with the MobSF framework:

{% embed url="<https://mobsf.live/>" %}

<div align="left"><img src="/files/RJFcjBG4v2EEZXcgwY9j" alt=""></div>

Now we can open the package in jadx-gui and check for strings that looks like an URL.

<div align="left"><img src="/files/9aQloyfH7tWoiTNFbr0P" alt=""></div>

![](/files/WCrWUq9pulr398v1BSLW)

Maybe the CC Server URL will add a string from the list above. I’ll upload the apk file to virus total and get this graph: Note: We can see the string /stbi

![](/files/lseJnlvizcGxPjKGalLP)

Potential CC Server:

IP: 119.28.128.207 (CN)\
Protocol: http\
Port: 7878


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