Consider Grimwepa a front-end to many famous Wired Equivalent Privacy (WEP) and Wi-Fi Protected Access (WPA) password auditors. We haven’t been able to use this one as we have been very busy with various assignments. But, still this is worth a mention.
Grimwepa is a password cracker for both WEP and WPA-encrypted access points (routers). It is written in Java and is intended for use with the Linux Operating System, more specifically for the BackTrack distro’s. It has only two modes: Crack WEP-encrypted access points (routers) and crack WPA-encrypted access points. It can search for new targets, and auto-selects your cracking method! Pretty much everything is done for you.
Grimwepa uses the following applications and suites:
- aircrack-ng suite:
- iwconfig, to see if devices are in monitor mode;
- xterm, to show output to user;
- ifconfig, to get the MAC address of devices;
- macchanger, to change MAC address of wifi cards.
o aircrack-ng, to crack WPA and WEP;
o airodump-ng, to capture packets and find access points;
o airmon-ng, to enumerate devices in monitor mode;
o aireplay-ng, to forge and replay packets;
o packetforge-ng, to create replay packets.
Since these applications exist on the current distribution of BackTrack, you can use this application without having to install all these.
A sample screen shot of Grimwepa:
The author built Grimwepa because the default cracker on BackTrack 4 did not work from him. It supports a lot of attack methods. Those are:
Attacks for WEP-encrypted Access Points:
- ARP-Replay attack
- Chop-chop attack
- Fragmentation attack
- p0841 attack
- Cafe-Latte attack
Cracking options:
o aircrack-ng is able to crack just about any WEP password after about 20,000 IV (Initialization Vector) data packets have been captured. The capture usually takes about 2 minutes, and the crack another 2-3 minutes.
Attacks for WPA-encrypted Access Points:
Basic de-authorization attack to get handshake.
Cracking:
o GRIM WEPA includes a 2MB default password list containing approximately 250,000 commonly-used passwords.
o Wordlist / Dictionary / Brute-force attack: Currently, there is only one consistent method of cracking WPA, and that is by brute force.
This is a Java application and so it could work on almost all *Nix distributions. Executing Grimwepa is also pretty simple. Just execute the following command:
java -jar grimwepa_X.X.jar
Here X.X is your version of Grimwepa.
Download Grimwepa v1.10 alpha 5 here.
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