Ubuntu 14.0

Hi! 🙂 Here another way of decompiling an android apk file. This method does not directly decompile the source. First uses the tool “Dex2jar” to convert the classes.dex file in to a compressed jar file containing the .class files . Later the “jd-gui” decompiler can be used to decompile the jar file content to the original source. Following figure shows the process of compiling android source into an apk and the reverse engineering flow.

Convert the dex file to a jar with “dex2jar”

Download the latest “dex2jar” from –> (https://sourceforge.net/projects/dex2jar/files)

Unzip the file . The d2j-dex2jar.sh file in the dex2jar-2.0 diectory is used to generate the jar file.

Make the .d2j-invoke.sh file executable. Otherwise you will get permission denied message.

Command $ sudo chmod +x d2j-invoke.sh

Goto the dex2-jar foler –>Execute the following command to generate the jar file. This will create something like classes-dex.jar

This is the classes.dex file that I am using in the example.

Command $ sh d2j-dex2jar.sh <path to classes.dex file>

you can simply drag and drop the classes.dex file to the terminal so that it will take the path automatically.

The resulted classes-dex2jar.jar file will be generated in the same location.

You can unzip the jar file and see that it contains .class files

Decompile the original source with “JD-GUI” decompiler

Download the “jd-gui” for linux from -> (http://jd.benow.ca/)

Unzip the file and you will see “jd-gui” executable file.

If you are having 64 bit Ubuntu 14.0 then install following libs

Command $ sudo apt-get install libgtk2.0-0:i386 libxxf86vm1:i386 libsm6:i386 lib32stdc++6

Now run the “jd-gui”. It will open the decompiler

Open the generated classes-dex2jar.jar file from the decompiler. You will be able to view the original source from this.

Cheers ! 🙂

Reason 1: If you have a fresh installation of Ubuntu 14.0 , then before installing android SDK you have to install java environment.
Reason 2: If still the file is not executable. Select android SDK Manager tool –>Goto -> Edit–>Preferences –> Behavior –>select the “Run executable text files when they are opened” at “Executable Text Files”

Solution 1:

tharaka@tharaka-ubuntu14:~$ sudo add-apt-repository ppa:webupd8team/java
[sudo] password for tharaka:
Oracle Java (JDK) Installer (automatically downloads and installs Oracle JDK6 / JDK7 / JDK8). There are no actual Java files in this PPA.

More info (and Ubuntu installation instructions):
– for Oracle Java 7: http://www.webupd8.org/2012/01/install-oracle-java-jdk-7-in-ubuntu-via.html
– for Oracle Java 8: http://www.webupd8.org/2012/09/install-oracle-java-8-in-ubuntu-via-ppa.html

Debian installation instructions:
– Oracle Java 7: http://www.webupd8.org/2012/06/how-to-install-oracle-java-7-in-debian.html
– Oracle Java 8: http://www.webupd8.org/2014/03/how-to-install-oracle-java-8-in-debian.html
More info: https://launchpad.net/~webupd8team/+archive/ubuntu/java
Press [ENTER] to continue or ctrl-c to cancel adding it

gpg: keyring `/tmp/tmp3pswad7h/secring.gpg’ created
gpg: keyring `/tmp/tmp3pswad7h/pubring.gpg’ created
gpg: requesting key EEA14886 from hkp server keyserver.ubuntu.com
gpg: /tmp/tmp3pswad7h/trustdb.gpg: trustdb created
gpg: key EEA14886: public key “Launchpad VLC” imported
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
OK
tharaka@tharaka-ubuntu14:~$ clear

tharaka@tharaka-ubuntu14:~$ sudo apt-get update && sudo apt-get install oracle-java7-installer
Ign http://security.ubuntu.com trusty-security InRelease
Ign http://ppa.launchpad.net trusty InRelease
Ign http://lk.archive.ubuntu.com trusty InRelease
Get:1 http://security.ubuntu.com trusty-security Release.gpg [933 B]
Ign http://extras.ubuntu.com trusty InRelease
Get:2 http://security.ubuntu.com trusty-security Release [62.0 kB]
Ign http://lk.archive.ubuntu.com trusty-updates InRelease
Hit http://extras.ubuntu.com trusty Release.gpg
Get:3 http://ppa.launchpad.net trusty Release.gpg [316 B]
Hit http://extras.ubuntu.com trusty Release
Ign http://lk.archive.ubuntu.com trusty-backports InRelease
Get:4 http://ppa.launchpad.net trusty Release [15.1 kB]
Hit http://lk.archive.ubuntu.com trusty Release.gpg
Get:5 http://security.ubuntu.com trusty-security/main Sources [64.8 kB]
Hit http://extras.ubuntu.com trusty/main Sources
Get:6 http://lk.archive.ubuntu.com trusty-updates Release.gpg [933 B]
Get:7 http://ppa.launchpad.net trusty/main amd64 Packages [2,863 B]
Hit http://extras.ubuntu.com trusty/main amd64 Packages
Get:8 http://security.ubuntu.com trusty-security/restricted Sources [2,061 B]
Hit http://lk.archive.ubuntu.com trusty-backports Release.gpg
Hit http://extras.ubuntu.com trusty/main i386 Packages
Get:9 http://ppa.launchpad.net trusty/main i386 Packages [2,863 B]
Get:10 http://security.ubuntu.com trusty-security/universe Sources [17.5 kB]
Hit http://lk.archive.ubuntu.com trusty Release
Get:11 http://security.ubuntu.com trusty-security/multiverse Sources [1,896 B]
Get:12 http://ppa.launchpad.net trusty/main Translation-en [1,381 B]
Get:13 http://lk.archive.ubuntu.com trusty-updates Release [62.0 kB]
Get:14 http://security.ubuntu.com trusty-security/main amd64 Packages [200 kB]
Get:15 http://security.ubuntu.com trusty-security/restricted amd64 Packages [8,875 B]
Get:16 http://security.ubuntu.com trusty-security/universe amd64 Packages [85.3 kB]
Hit http://lk.archive.ubuntu.com trusty-backports Release
Get:17 http://security.ubuntu.com trusty-security/multiverse amd64 Packages [3,458 B]
Hit http://lk.archive.ubuntu.com trusty/main Sources
Get:18 http://security.ubuntu.com trusty-security/main i386 Packages [190 kB]
Hit http://lk.archive.ubuntu.com trusty/restricted Sources
Hit http://lk.archive.ubuntu.com trusty/universe Sources
Get:19 http://security.ubuntu.com trusty-security/restricted i386 Packages [8,846 B]
Ign http://extras.ubuntu.com trusty/main Translation-en_US
Hit http://lk.archive.ubuntu.com trusty/multiverse Sources
Get:20 http://security.ubuntu.com trusty-security/universe i386 Packages [85.2 kB]
Ign http://extras.ubuntu.com trusty/main Translation-en
Hit http://lk.archive.ubuntu.com trusty/main amd64 Packages
Get:21 http://security.ubuntu.com trusty-security/multiverse i386 Packages [3,624 B]
Hit http://lk.archive.ubuntu.com trusty/restricted amd64 Packages
Hit http://security.ubuntu.com trusty-security/main Translation-en
Hit http://security.ubuntu.com trusty-security/multiverse Translation-en
Hit http://lk.archive.ubuntu.com trusty/universe amd64 Packages
Hit http://security.ubuntu.com trusty-security/restricted Translation-en
Hit http://lk.archive.ubuntu.com trusty/multiverse amd64 Packages
Hit http://lk.archive.ubuntu.com trusty/main i386 Packages
Hit http://security.ubuntu.com trusty-security/universe Translation-en
Hit http://lk.archive.ubuntu.com trusty/restricted i386 Packages
Hit http://lk.archive.ubuntu.com trusty/universe i386 Packages
Hit http://lk.archive.ubuntu.com trusty/multiverse i386 Packages
Hit http://lk.archive.ubuntu.com trusty/main Translation-en
Hit http://lk.archive.ubuntu.com trusty/multiverse Translation-en
Hit http://lk.archive.ubuntu.com trusty/restricted Translation-en
Hit http://lk.archive.ubuntu.com trusty/universe Translation-en
Get:22 http://lk.archive.ubuntu.com trusty-updates/main Sources [161 kB]
Get:23 http://lk.archive.ubuntu.com trusty-updates/restricted Sources [2,061 B]
Get:24 http://lk.archive.ubuntu.com trusty-updates/universe Sources [99.9 kB]
Get:25 http://lk.archive.ubuntu.com trusty-updates/multiverse Sources [4,463 B]
Get:26 http://lk.archive.ubuntu.com trusty-updates/main amd64 Packages [412 kB]
Get:27 http://lk.archive.ubuntu.com trusty-updates/restricted amd64 Packages [8,875 B]
Get:28 http://lk.archive.ubuntu.com trusty-updates/universe amd64 Packages [244 kB]
Get:29 http://lk.archive.ubuntu.com trusty-updates/multiverse amd64 Packages [11.2 kB]
Get:30 http://lk.archive.ubuntu.com trusty-updates/main i386 Packages [402 kB]
Get:31 http://lk.archive.ubuntu.com trusty-updates/restricted i386 Packages [8,846 B]
Get:32 http://lk.archive.ubuntu.com trusty-updates/universe i386 Packages [245 kB]
Get:33 http://lk.archive.ubuntu.com trusty-updates/multiverse i386 Packages [11.3 kB]
Hit http://lk.archive.ubuntu.com trusty-updates/main Translation-en
Hit http://lk.archive.ubuntu.com trusty-updates/multiverse Translation-en
Hit http://lk.archive.ubuntu.com trusty-updates/restricted Translation-en
Hit http://lk.archive.ubuntu.com trusty-updates/universe Translation-en
Hit http://lk.archive.ubuntu.com trusty-backports/main Sources
Hit http://lk.archive.ubuntu.com trusty-backports/restricted Sources
Hit http://lk.archive.ubuntu.com trusty-backports/universe Sources
Hit http://lk.archive.ubuntu.com trusty-backports/multiverse Sources
Hit http://lk.archive.ubuntu.com trusty-backports/main amd64 Packages
Hit http://lk.archive.ubuntu.com trusty-backports/restricted amd64 Packages
Hit http://lk.archive.ubuntu.com trusty-backports/universe amd64 Packages
Hit http://lk.archive.ubuntu.com trusty-backports/multiverse amd64 Packages
Hit http://lk.archive.ubuntu.com trusty-backports/main i386 Packages
Hit http://lk.archive.ubuntu.com trusty-backports/restricted i386 Packages
Hit http://lk.archive.ubuntu.com trusty-backports/universe i386 Packages
Hit http://lk.archive.ubuntu.com trusty-backports/multiverse i386 Packages
Hit http://lk.archive.ubuntu.com trusty-backports/main Translation-en
Hit http://lk.archive.ubuntu.com trusty-backports/multiverse Translation-en
Hit http://lk.archive.ubuntu.com trusty-backports/restricted Translation-en
Hit http://lk.archive.ubuntu.com trusty-backports/universe Translation-en
Ign http://lk.archive.ubuntu.com trusty/main Translation-en_US
Ign http://lk.archive.ubuntu.com trusty/multiverse Translation-en_US
Ign http://lk.archive.ubuntu.com trusty/restricted Translation-en_US
Ign http://lk.archive.ubuntu.com trusty/universe Translation-en_US
Fetched 2,430 kB in 36s (67.4 kB/s)
Reading package lists… Done
Reading package lists… Done
Building dependency tree
Reading state information… Done
The following extra packages will be installed:
gsfonts-x11 java-common
Suggested packages:
default-jre equivs binfmt-support visualvm ttf-baekmuk ttf-unfonts
ttf-unfonts-core ttf-kochi-gothic ttf-sazanami-gothic ttf-kochi-mincho
ttf-sazanami-mincho ttf-arphic-uming
The following NEW packages will be installed:
gsfonts-x11 java-common oracle-java7-installer
0 upgraded, 3 newly installed, 0 to remove and 277 not upgraded.
Need to get 161 kB of archives.
After this operation, 631 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://ppa.launchpad.net/webupd8team/java/ubuntu/ trusty/main oracle-java7-installer all 7u76+7u60arm-0~webupd8~0 [22.0 kB]
Get:2 http://lk.archive.ubuntu.com/ubuntu/ trusty/main java-common all 0.51 [130 kB]
Get:3 http://lk.archive.ubuntu.com/ubuntu/ trusty/main gsfonts-x11 all 0.22 [9,108 B]
Fetched 161 kB in 2s (70.9 kB/s)
Preconfiguring packages …
Selecting previously unselected package java-common.
(Reading database … 169854 files and directories currently installed.)
Preparing to unpack …/java-common_0.51_all.deb …
Unpacking java-common (0.51) …
Selecting previously unselected package oracle-java7-installer.
Preparing to unpack …/oracle-java7-installer_7u76+7u60arm-0~webupd8~0_all.deb …
Unpacking oracle-java7-installer (7u76+7u60arm-0~webupd8~0) …
Selecting previously unselected package gsfonts-x11.
Preparing to unpack …/gsfonts-x11_0.22_all.deb …
Unpacking gsfonts-x11 (0.22) …
Processing triggers for man-db (2.6.7.1-1) …
Processing triggers for doc-base (0.10.5) …
Processing 2 added doc-base files…
Processing triggers for shared-mime-info (1.2-0ubuntu3) …
Processing triggers for gnome-menus (3.10.1-0ubuntu2) …
Processing triggers for desktop-file-utils (0.22-1ubuntu1) …
Processing triggers for bamfdaemon (0.5.1+14.04.20140409-0ubuntu1) …
Rebuilding /usr/share/applications/bamf-2.index…
Processing triggers for mime-support (3.54ubuntu1) …
Processing triggers for fontconfig (2.11.0-0ubuntu4.1) …
Setting up java-common (0.51) …
Setting up oracle-java7-installer (7u76+7u60arm-0~webupd8~0) …
Downloading Oracle Java 7…
–2015-02-06 11:08:02– http://download.oracle.com/otn-pub/java/jdk/7u76-b13/jdk-7u76-linux-x64.tar.gz
Resolving download.oracle.com (download.oracle.com)… 104.75.84.10, 104.75.84.19
Connecting to download.oracle.com (download.oracle.com)|104.75.84.10|:80… connected.
HTTP request sent, awaiting response… 302 Moved Temporarily
Location: https://edelivery.oracle.com/otn-pub/java/jdk/7u76-b13/jdk-7u76-linux-x64.tar.gz [following]
–2015-02-06 11:08:02– https://edelivery.oracle.com/otn-pub/java/jdk/7u76-b13/jdk-7u76-linux-x64.tar.gz
Resolving edelivery.oracle.com (edelivery.oracle.com)… 23.49.166.37
Connecting to edelivery.oracle.com (edelivery.oracle.com)|23.49.166.37|:443… connected.
HTTP request sent, awaiting response… 302 Moved Temporarily
Location: http://download.oracle.com/otn-pub/java/jdk/7u76-b13/jdk-7u76-linux-x64.tar.gz?AuthParam=1423201203_b865b5986caf86f8029f8ce7bf6b2cbb [following]
–2015-02-06 11:08:03– http://download.oracle.com/otn-pub/java/jdk/7u76-b13/jdk-7u76-linux-x64.tar.gz?AuthParam=1423201203_b865b5986caf86f8029f8ce7bf6b2cbb
Connecting to download.oracle.com (download.oracle.com)|104.75.84.10|:80… connected.
HTTP request sent, awaiting response… 200 OK
Length: 142249690 (136M) [application/x-gzip]
Saving to: ‘jdk-7u76-linux-x64.tar.gz’

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