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<p class="MsoNormal"><span style="font-family:"Courier New",serif">Hi Loïc.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New",serif">As Linghui already mentioned, the apk you delived is encrypted.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New",serif">After some investigation, I found that the “exception.apk” is actually a zip file. You can extract it with the key “infected” (I found that by bruteforcing).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New",serif">The contents of the zip file is an apk called “jin_old_2.1.apk” which seems to be a malicious application from the
<a href="https://www.trustwave.com/Resources/SpiderLabs-Blog/NickiSpy-C---Android-Malware-Analysis--Demo/">
NickiSpy family</a>. <a href="https://www.virustotal.com/en/file/ccc38fe8e3eed7ba56ea6683e5c919682eb203a37cf4d48cdead452a4ea8f385/analysis/1501062003/">
Virus Total</a> supports this observation.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New",serif">After extracting the apk, Soot should be able to analyze it.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New",serif">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New",serif">Manuel<o:p></o:p></span></p>
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