Tuesday, 16 May 2017

Ransomware Solution

What is Ransomware?
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Ransomware is a malicious software that encrypts the files and locks device, such a
a computer, tablet or smartphone and then demands a ransom to unlock it. Recently, a
dangerous ransomware named 'Wannacry' has been affecting the computers worldwide
creating the biggest ransomware attack the world has ever seen. This has affected
computers in India also.


What is WannaCry Ransomware?


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WannaCry ransomware attacks windows based machines. It also goes by the name
WannaCrypt
, WannaCry , WanaCrypt0r , WCrypt , WCRY. It leverages SMB exploit in
Windows machines called Eternal Blue to attack and inject the malware. All versions of
windows before Windows 10 are vulnerable to this attack if not patched for MS-17-010.
After a system is affected, it encrypts the files and shows a pop up with a countdown and
instructions on how to pay the 300$ in bitcoins to decrypt and get back the original files. If
the ransom is not paid in 3 days, the ransom amount increases to 600$ and threatens the
user to wipe off all the data. It also installs DOUBLEPULSAR backdoor in the machine.
What can you do to prevent infection?


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Microsoft has released a Windows security patch MS17-010 for Windows machines.
This needs to be applied immediately and urgently.
 Remove Windows NT4, Windows 2000 and Windows XP-2003 from production
environments.
 Block ports 139, 445 and 3389 in firewall.
 Avoid clicking on links or opening attachments or emails from people you don't
know or companies you don't do business with.
 SMB is enabled by default on Windows. Disable smb service on the machine by
going to Settings > uncheck the settings > OK
 Make sure your software is up-to-date.
 Have a pop-up blocker running on your web browser.
 Regularly backup your files.
 Install a good antivirus and a good antiransomware product for better security.
File Names:




• @Please_Read_Me@.txt

• @WanaDecryptor@.exe


• @WanaDecryptor@.exe.lnk

• Please Read Me!.txt (Older variant)

• C:\WINDOWS\tasksche.exe

• C:\WINDOWS\qeriuwjhrf

• 131181494299235.bat

• 176641494574290.bat

• 217201494590800.bat


• [0-9]{15}.bat #regex

• !WannaDecryptor!.exe.lnk

• 00000000.pky

• 00000000.eky

• 00000000.res

• C:\WINDOWS\system32\taskdl.exe


Ransomware Advisory Note Released by Cyber cell Police Head Quarter.



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