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Recover your Pendrive folders from the BronTok virus attack

Sajid Muhaimin ChoudhuryPosted by in Miscellaneous on June 3rd, 2010, 20 Joishtho 1417

Perhaps the most notorious virus that is spreading through all computers in bangladesh is the Win32 Brontok virus. It is possibly the sole reason that many people chose to switch to a Windows 7.

The virus is updating itself. Back in early days, it used to create a New Folder.Exe file and make the exe icon identical to the folder icon of windows. Unsuspecting user would double click, and his PC would be instantly infected. Now improved versions of this virus causes the task manager, folder options to disappear. The “Show Hidden files and folders” also does not work. Most annoyingly, the recent version of the virus locks all folders of the pendrive as hidden, and you cannot make them unhidden even from windows 7 folder options.

To fix such a pendrive, I created a batch file. It removes the folder lock and unhides all the hidden folders in your pendrive. The batch then deletes all exe files in the root directory (So please don’t mistakenly keep any installers in root folder of pendrive.), Finally it deletes the autoexec.bat file causing the virus. Just keep the batch file in your pendrive, and double click on a non infected PC to recover folders.

THe code of the batch file:

rem Created by Sajid Muhaimin Choudhury
Echo off
attrib -S -H -R /S /D
del *.exe
del autoexec.bat /F /S /Q
del killvirus.vbs /F /S /Q
mkdir autoexec.bat
mkdir killvirus.vbs
attrib +R +A +S +H autoexec.bat
attrib +R +A +S +H killvirus.vbs
Echo on

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MATLAB code for Major Minor grouping of students of Dept of EEE, BUET

Sajid Muhaimin ChoudhuryPosted by in matlab on May 19th, 2010, 5 Joishtho 1417

It’s been some time since I joined BUET as a lecturer. Today, we were assigning major and minor topics to students. The assigning process was quite cumbersome and had to be done by hand. In order to automate the process, I wrote a small MATLAB program that can be used to automate the process.

The major minor system of the Dept of EEE is quite simple. Currently, there are 3 major groups and 4 minor groups of the department. Based on decision of BUET Undergraduta Studies (BUGS) there is a maximum number of student per major or minor group. The groups are allocated according to CGPA of the students, and if more students want a particular major group than allowed limit, then students with better CGPA will get more preference.

Any how, I am pasting my program here:

% This program automates creation of major minor list of the students.
% Program was written by Sajid Muhaimin Choudhury, Lecturer, Department of
% EEE, BUET on 19/5/2010
 
clc
 
%constants:
N_maj_max = 60;
N_min_max = 60;
N_std = 180;
 
%Execute the program once, then open variable editor to edit rawdata and
% paste values from excel, columns are, roll, cgpa, maj_choice 1-4, minor
% choice 1-4. 
 
%rawdata = [1,2,3,4,5,6,7,8,9,10;4,5,6,7,8,9,10,11,12,5];
rawdata = sortrows(rawdata, -2); %sort according to CGPA
std_roll = rawdata(:,1)
std_cgpa = rawdata(:,2)
std_maj_choice = rawdata(:,3:6)
std_min_choice = rawdata(:,7:10)
 
std_maj = zeros(N_std,1);
std_min = zeros(N_std,1);
count_maj = zeros(1,4);
count_min = zeros(1,4);
%assign major group according to CGPA. 
for i = 1:N_std
    for j = 1:4
        if count_maj(std_maj_choice(i,j)) < N_maj_max
            count_maj(std_maj_choice(i,j)) = count_maj(std_maj_choice(i,j)) +1;
            std_maj(i) = std_maj_choice(i,j);
            break;
        end
   end
end
 
 
%assign minor group according to CGPA
for i = 1:N_std
    for j = 1:4
        if (count_min(std_min_choice(i,j)) < N_min_max) &&  (std_min_choice(i,j) ~= std_maj(i))
            count_min(std_min_choice(i,j)) = count_min(std_min_choice(i,j)) +1;
            std_min(i) = std_min_choice(i,j);
            break;
        end
   end
end
 
final_result = [std_roll'; std_cgpa' std_maj'; std_min']';
 
final_result = sortrows(final_result, 1);

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Auto Routing in Single Layer – Proteus Isis and Ares

Sajid Muhaimin ChoudhuryPosted by in pcb layout on April 6th, 2010, 23 Chaitro 1416

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Switched my academic website to webnode

Sajid Muhaimin ChoudhuryPosted by in Uncategorized on April 6th, 2010, 23 Chaitro 1416

As I mentioned earlier, I used Google Sites to maintain my academic website. The google sites is a great choice with unlimited bandwidth of site, but the layout and themes of the site is quite restricted. I was looking for some alternative to that. Weebly posed as an impressive alternative, but wasn’t quite that good. I stumbled upon webnode. It’s interface and default themes are really impressive. Moreover, they allow you to edit the default css of the themes.

This is a custom made theme for my present website, (still teacher.buet.ac.bd/sajid)

The header of the site is taken from a CC website, possibly free web headers or some website.

There is one catch of webnode. Since it earns its revenue by web hosting, the free package comes with only 1GB bandwidth. So, the site is not quite suitable for hosting large files. I’ll try to use some other disk services for the file sharing part. Otherwise webnode is just fine.

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Bookmarklet for Google Dictionary

Sajid Muhaimin ChoudhuryPosted by in Bookmarklet, Uncategorized, web-development on December 23rd, 2009, 9 Poush 1416

A reader of my blog was kind to let me know by telephone that he was eager to use Google dictionary with my inline dictionary bookmarklet. So today I am launching the Google version of my bookmarklet. As usual, drag them to your browser bar to use. The English to Bangla dictionary is still being developed, and not that robust.

[English to Bangla]

[English to English]

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Google Sites – Home of my academic website

Sajid Muhaimin ChoudhuryPosted by in Personal on December 22nd, 2009, 8 Poush 1416

I like wordpress as a blogging environment. And freebeehosting is a as great as a hosting platform can ever be. But for my academic materials, I need a hosting platform that is 24×7 available without any interruption. Google sites seemed to be a good option.

The BUET website management allows to upload 5 files at a time. So all I did was to create an index.html file with iframe set to my google site page.

Google sites give options to rapidly create a website. I edited a default theme to incorporate the BUET logo into the banner. Problem is, you can’t have any custom CSS or javascript code, and if you are logged in, the google icons appear overhead.

Nevertheless, it is where I am hosting all my course related materials.

My BUET page: teacher.buet.ac.bd/sajid

My actual Sites Page: sites.google.com/site/smcbuet/

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