README.md

WhatsApp Media Decrypt

A recent high-profile forensic investigation reported that “due to end-to-end encryption employed by WhatsApp, it is virtually impossible to decrypt the contents of the downloader [.enc file] to determine if it contained any malicious code in addition to the delivered video.”

This project demonstrates how to decrypt encrypted media files downloaded from WhatsApp.

Installation

$ go get github.com/ddz/whatsapp-media-decrypt

Usage

Usage of whatsapp-media-decrypt:
  -o file
    	write decrypted output to file
  -t type
    	media type (1 = image, 2 = video, 3 = audio, 4 = doc)

Example

$ whatsapp-media-decrypt -o Atzc5Drr8l7ngis8GmUTMI6vMQNjOU9zGQ2SYRkjwq44.mp4 -t 2 Atzc5Drr8l7ngis8GmUTMI6vMQNjOU9zGQ2SYRkjwq44.enc 0A2069A349914734B9359DA0CD8923E6DFDE06F1E2BCE23222C738C521570BA8242A1220A1F5AEB2E620F73007FA853200559B2669455BB5818F619397C638042D8F7F2A18B984A5F1052000

Acquire ChatStorage.sqlite

(Left as an exercise for the reader)

Extract mediaKey

$ sqlite ChatStorage.sqlite
SQLite version 3.27.2 2019-03-09 15:45:46
Enter ".help" for usage hints.
sqlite> select ZMEDIAURL,ZVCARDSTRING,hex(ZMEDIAKEY) from ZWAMEDIAITEM where Z_PK = 1795;
https://mmg-fna.whatsapp.net/d/f/Atzc5Drr8l7ngis8GmUTMI6vMQNjOU9zGQ2SYRkjwq44.enc|video/mp4|0A2069A349914734B9359DA0CD8923E6DFDE06F1E2BCE23222C738C521570BA8242A1220A1F5AEB2E620F73007FA853200559B2669455BB5818F619397C638042D8F7F2A18B984A5F1052000
sqlite> .quit

Download Encrypted Media File

$ curl -O https://mmg-fna.whatsapp.net/d/f/Atzc5Drr8l7ngis8GmUTMI6vMQNjOU9zGQ2SYRkjwq44.enc
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  389k  100  389k    0     0  1966k      0 --:--:-- --:--:-- --:--:-- 1956k

Decrypt Media File

$ whatapp-media-decrypt -o Atzc5Drr8l7ngis8GmUTMI6vMQNjOU9zGQ2SYRkjwq44.mp4 -t 2 ./Atzc5Drr8l7ngis8GmUTMI6vMQNjOU9zGQ2SYRkjwq44.enc 0A2069A349914734B9359DA0CD8923E6DFDE06F1E2BCE23222C738C521570BA8242A1220A1F5AEB2E620F73007FA853200559B2669455BB5818F619397C638042D8F7F2A18B984A5F1052000

References

WhatsApp Web Reverse Engineered

go-whatsapp