In this video, we write a custom Android Decryptor using Java!
Timestamps:
00:00 Intro
00:37 Getting Sample
01:35 Finding First Run Code
02:30 Dynamic Decryption
03:34 Unpacking
05:11 DexClassLoader
07:24 Strings
09:57 What The Dex?
13:09 Methods
14:25 Dead Code
15:50 Xrefs
18:36 APK File Structure
22:10 Manually Passing Bytes
24:23 Static Methods
27:23 Decoded DEX
28:41 Recap
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Useful Links:
DexClassLoader definition: https://developer.android.com/reference/dalvik/system/DexClassLoader
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Malware Used in video:
sha256:387341d7438c649bf2345b751a9b5ed445651dfae1e1966e08977c0a4b129207
Link:
https://mega.nz/file/kZR2SLgB#Zl1t0VUIDsHkCaoyedeESFINBiLmU4ay3vTLh0-lWjQ
Password: malware123
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