Rootkit Hunter is a Unix-primarily based scanning tool that scans for rootkits, backdoors and possible local exploits. It does this by comparing SHA-1 hashes of vital files with known good ones in online database, looking for default directories (of rootkits), improper permissions, hidden records data, suspicious strings in kernel modules and particular tests for Linux or FreeBSD. Most instances rootkits are self-hiding toolkits utilized by blackhats, crackers and script kiddies, to keep away from the attention of the system admin. If you’re unsure as to whether your system is compromised, you will get a second opinion from sources such as Linux-oriented forum. If your system is contaminated with a rootkit, cleaning it up will not be an option. Restoring can be not an option unless you might be expert, and have autonomous and an impartial means of verifying that the backup is clear, and does not include misconfigured or stale software. Never trust a potentially compromised machine! Basically a clean install of the OS is always advisable after backing up the system.
This week, in our Linux Page (in Spanish) we posted an essential manual about the best software to convert a video file from mkv to a more common (and readable) avi format. First of all we tried with a well known line program: ffmpeg but we had different problems and we did not succeed. For this reason we tried to install the specific libavcodec-unstripped-51 package but we were not able to convert our file. For our second test we installed avidemux but also in this case the mkv file resisted. Then we read in a post that VLC contains a powerful converter and we used it to transform the mkv file to avi. Unfortunately we succed only for the audio part of our file but we were not able to obtain a complete video file. Only during our last test we transform the mkv video to avi using WinFF. This program, based on ffmpeg, has a very clear graphical interface and it is very intuitive to use. After ten minutes of trials we were able to correct our settings and to start the file conversion. In the WinFF menu you can easily choose between many different video and audio formats (in our test we chose AVI) with a Device Preset setted to XviD in AVI (16:9) and decide the output folder you prefer. WinFF -does not work- if you do not insert the mandatory data in the below part of the menu. In our test we setted:
Video Bitrate = empty (null = we did not write anything)
Frame rate = 25
Video Size = 592 x 320
Aspect Ratio = 16:9
Audio Bitrate = 118
Sample Rate = 48000
Audio Channels = 2
Additional Command Line Parameters (advanced)
null = we did not write anything
We recommend WinFF to all that people who are not very clever with line command programs and need to easily transform video files to a different formats!
This week, in our Linux Page (in Spanish), we have described UNetbootin: a powerful software which allows you to install many different Linux OS (Ubuntu, Fedora, openSUSE, CentOS, Debian, ArchLinux and many others) on a bootable USB key. The use of UNetbootin is really simple and after a couple of tests everyone is able to create his/her own portable OS on USB. Moreover can be used to easily install a new Linux OS directly on the local hard disk. In fact, this software properly manages Linux and Windows bootloader without causing side effects. I personally recommend UNetbootin to all the people who always desires testing the last OS versions and do not want to install them directly on their PC. Last but not least, UNetbootin is available in the followiing languages: English, Spanish, Russian, Portuguese and Hungarian. Easy, useful tool!