Wednesday 16 February 2011

Using command prompt "attrib" to check for Viruses or Malware

Using command prompt "attrib" to check for Viruses or Mal ware



he Command Prompt will appear showing us where is our location in the directory.
command prompt showing the current location in the directory

Using attrib

To use attrib
  1. Go to the root directory first by typing cd\(because this is always the target of Malware / Virus)
2. Type attrib and press Enter key
after typing attrib, all the attributes of all the files (excluding folders) will be shown
  • Spanish Galleon Andalucia
    The Spanish Galleon Andalucia visited the beautiful island of bohol from October 23-26,2010. -3 months ago
  • Uchiha Sasuke Team Hebi
    Hebi (means snake) is a group of specialized shinobi created by Uchiha Sasuke having one goal in mind, and that is to kill his brother Uchiha Itachi. - 3 months ago
  • Microsoft Innovation with Microsoft Surface codename milan
    Microsoft Surface (code name: Milan) is a multi-touch product from Microsoft, designed as a combination of software and hardware technology, which the user sends or more uses of digital content is being... - 4 months ago
In this example, I have two files that are considered as malware.
Note that there are two files which I outlined in red (SilentSoftech.exe and autorun.inf). Since you cannot see this file nor delete it (because the attributes that was set on these files are +s +h +r)
  1. +s - meaning it is a system file (which also means that you cannot delete it just by using the delete command)
  2. +h - means it is hidden (so you cannot delete it)

  3. +r - means it is a read only file ( which also means that you cannot delete it just by using the delete command)

Now we need to set the attributes of autorun.inf to -s -h -r (so that we can manually delete it)
  1. Type attrib -s -h -r autorun.inf ( be sure to include -s -h -r because you cannot change the attributes using only -s or -h or -r alone)
  2. Type attrib again to check if your changes have been commited
  3. If the autorun.inf file has no more attributes, you can now delete it by typingdel autorun.inf
  4. Since SilentSoftech.exe is a malware you can remove its attributes by doing step 1 and step 3(just change the filename) ex. attrib -s -h -r silentsoftech.exe

There you have it!!!!
NOTE : when autorun.inf keeps coming back even if you already deleted it, be sure to check your Task Manager by pressing CTRL + ALT + DELETE ( a virus is still running as a process thats why you cannot delete it.KILL the process first by selecting it and clicking End Process.
NOTE: You can also apply the attrib -s -h -r command to all the partition of your computer, drive D: drive E: drive F: (all of your drives). For example. for drive D, just type "D:" (minus the double quote) then you can see that your current drive is D.. type there the command "attrib -s -h -r *.exe" for exe files and "attrib -s -h -r *.inf" and then delete the file by "del autorun.inf".
Hope this helps!!!!! 
a) I typed the attrib command with the -s -h -r setting b) the result after I pressed enter - autorun.inf has no attributes left


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