#Crypto locker worm how to#
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UPDATE 8:28AM ET: Microsoft, in an unexpected move, has released an emergency patch for it’s non-supported and legacy operating systems.

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This will ensure that in the event the sinkhole is DOS’d or taken offline, or if you have heavy egress filtering and don’t allow HTTP communications, that you still ensure the website can be visited to shut the malicious software down. UPDATE 9:44AM ET: It’s recommended to create a local DNS entry in your network for the domain name and point it to a HTTP website within your network that you control. More analysis from initial discovery here. Note that this is only a temporary solution and it is advised heavily that you patch your systems immediately with MS17-010. It is advised to use internal DNS (as mentioned below) to point to an active/website internally that will always be available in the event the site is down or servers can’t reach to this. This domain has already been registered and is sinkholed. The domain name goes to a different URL:. UPDATE 11:38AM ET: A new variant with a different kill switch name was discovered this morning. In Windows XP, it’s possible to search the wcry.exe memory and does not erase the prime numbers used to generate the key. This only works on Windows XP due to using proper cryptography libraries.

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Consider using Office Viewer software to open Microsoft Office files transmitted via e-mail instead of full Office suite applications.UPDATE 10:40AM ET: A new tool was released from Adrien Guinet that can decrypt WannaCry impacted systems.

Disable macro scripts from Microsoft Office files transmitted via e-mail.

If a user only needs to read specific files, they should not have write access to those files, directories, or shares.

Configure access controls including file, directory, and network share permissions with least privilege in mind.

Those with a need for administrator accounts should only use them when necessary. No users should be assigned administrative access unless absolutely needed. Implement the principle of least privilege.

Manage the use of privileged accounts.Ensure anti-virus and anti-malware solutions are set to automatically conduct regular scans.Scan all incoming and outgoing e-mails to detect threats and filter executable files from reaching the end users.Enable strong spam filters to prevent phishing e-mails from reaching the end users and authenticate in-bound e-mail using technologies like Sender Policy Framework (SPF), Domain Message Authentication Reporting and Conformance (DMARC), and DomainKeys Identified Mail (DKIM) to prevent e-mail spoofing.

Monitor traffic to these ports for out of ordinary behavior.

Limit traffic from/to ports 139 and 445 to internal network only.

Perform a detailed vulnerability scan of all systems on your network and apply missing patches ASAP.

Apply the Microsoft patch for the MS17-010 SMB vulnerability dated March 14, 2017.

Netsurion SIEM-at-the-Edge was introduced earlier this year for this very reason.

While anti-virus and managed firewalls are essential, alone they are not enough. Netsurion is continually working to deliver more advanced threat protection for situations just like this.

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If you have not been infected, it is very important that you learn how to defend your systems. We are observing this ransomware worm spread rapidly. Networks in many businesses and critical infrastructure like healthcare and finance across 150+ countries have been infected by the WannaCry ransomware worm, aka WanaCrypt, WannaCrypt or Wcry. As the second iteration of the ransomware strain impacting IT infrastructure around the globe is expected, we want to arm our customers with information to be best prepared.