Decompile APK into Java and Xml (Hunt for Malware)
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locate an apk to play with
https://www.apkmirror.com/
https://apkbucket.net/

I selected
https://apkbucket.net/apk/badoink-video-downloader/com.badoinkfree/

Scan for malware with https://apkscan.nviso.be/
https://apkscan.nviso.be/report/show/10f93222344135823e33d02efba5549a

look for a description of the virus
https://www.symantec.com/security-center/writeup/2014-032815-4549-99

pull apart with
APKTOOL: https://ibotpeaches.github.io/Apktool/
(apktool.exe and apktool.jar into C:windows)
run “apktool d com.badoinkfree.apk”
creates an exported folder with smali files
(Android Smali Assembly Language File)

rename apk to zip and extract the classes.dex
DEX2JAR: https://sourceforge.net/p/dex2jar
d2j-dex2jar classes.dex

copy out the Jar file
JD-GUI: http://jd.benow.ca/
open with jdgui
search airpush

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Tools used
– virustotal
– Hybrid-analysis
– HexRays /IDA
– Process Hacker
– Process Monitor
– Wireshark
– many more specific to each video

……….: About the music :……….

Music Provided by the Following

Rock Intro 3 by Audionautix is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/)
Artist: http://audionautix.com/

source