6 Replies Latest reply on Feb 22, 2016 12:31 AM by Unblack

    Locky Ransomware DAT?

    Daniel_S

      Hey everyone,

      as it is a pain in the *** to get infos whether or not McAfee VSE is protecting against certain threads,

      does anyone of you know if with the latest DAT protection against the Locky-Ransomware was added?

      Found some disturbing infos on Virustotal where it might be detected since 2 days as RDN/Trojan Drixed-FDY.

      But Locky has nothng to do with dridex!?

       

      Thanks

      Dan

        • 1. Re: Locky Ransomware DAT?
          thierry.lange

          Hi, Daniel

           

          Foundd this from the McAfee Labs W32/Locky.worm - Malware - McAfee Labs Threat Center

           

          regards

          1 of 1 people found this helpful
          • 2. Re: Locky Ransomware DAT?
            Troja

            Hi all,

            first of all. That´s the Problem with signature based detection technique. So, Locky Ransomware depends on your Gateway Systems for E-Mail and Web. Signature based technique is always reactive. Signature based technique (and this is a challenge for every virusscan vendor) is often not able to detect sophisticated threads. Signature based technique needs samples to detect the "dropper" or the "infector" and so on.

             

            We analyced some samples from customers. Any version of the Locky Ransomware was acting a little bit different. Many "things" are always random. This random "things" cannot be detected or removed by signature based technique.

            Thats the reality. Fight against and you will loose. :-)

            The "Locky Ransomware" executed some stuff directly from the infected Website without writing anything to the disk. But, afterwards a *.JS File was dropped on the System and afterwards executed. Now the real stuff starts......

            The samples wie analyzed used SSL Connections AND connected to sites which have been hacked. No bad Reputation, no bad URL Reputation.

            We checked the samples at virustotal, and it took days or weeks until the most vendors

             

            As you can see, just to wait for a signature, you will not be able to block ransomware in the most cases.

             

            There are many things you can do.

            - If you have a email Gateway e.g. remove OLE objects from Office documents.

            - Harden your Internet Proxy and inspect SSL!

            - Every outbreak at our customers looked like a little bit different. We blocked some stuff with Access Protection, but at the end of the game, when a new Ransomware version arrived, we started from the beginning. *lol*

             

            See attached an extra.dat File with some Locky detections. This might be useful.

             

            Cheers

            1 of 1 people found this helpful
            • 3. Re: Locky Ransomware DAT?
              exbrit
              1 of 1 people found this helpful
              • 4. Re: Locky Ransomware DAT?
                rmetzger

                Not sure this is a related virus, given that the "W32/Locky.worm" is a Worm dating back to 2004-04-20, long before the Ransomware Locky was developed. Seems to be an unfortunate coincidence of naming caused by the reuse of the name. Other than a name, there seems to be no relationship to the current malware called "Locky" (ransomware) which is a Word macro attack vector (and possibly Outlook/Windows Host Scripting), not a worm.

                 

                Though this should have been done years ago if Microsoft Update is used: In Word, set to "Disable all except digitally signed macros."

                Additionally, limit the attack exposure by reducing Access Rights to Network Shares to the absolute minimum.

                ALSO, make sure backups are current and not directly available to anyone except those responsible for the backups. Thus, if an attack is successful, restoration of encrypted files can be done after disinfecting the network or systems of Locky.

                 

                Stay Safe,

                Ron Metzger

                • 5. Re: Locky Ransomware DAT?

                  You need to supply a MD5/SHA1 hash of a file - since every vendor has their own naming convention, the hash is the only thing common that we can look up on.

                   

                  There are only, oh, 200,000 new viruses/variants a day, so giving them cool names is kind of pointless.

                  • 6. Re: Locky Ransomware DAT?
                    Unblack

                    How do i remove ole Objekts from Office Documents in the Email gateway? Do you mean macros under antivirus?