In case you do not have recent backups, pay the ransom and hope for the best. Do a restore from a backup prior to the date you see listed on the file creations. "nuke from orbit") and restore all the directories that have those encrypted files. That's how you can identify which workstation it originally came from and (re-)train the user. If your network gets hit with this, look at time stamps and owner(s) of the decrypt_instructions files that were loaded to the (mapped) drives. You'll be pleasantly surprised how affordable this is, and this month it comes with an innovative crypto-ransom offer you will like:
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You can get a free quote to find out how much this would be for your organization.
It's a very good idea to step your end-users through effective Kevin Mitnick Security Awareness Training. They also improved their marketing, as the latest version provides a new feature which is a button that gives you the chance to "Decrypt 1 file for FREE" and is fully functional. In the mean time, back at the ranch, ransomware grand-daddy CryptoLocker has continued to improve the quality of its spear-phishing attacks with fake fax announcement messages that start to look very real. Mind you, Cisco's customer base for their cloud web security is really large, so 17% is big numbers. Since Cisco began blocking the attacks on April 24, its researchers said they had blocked requests to over 90 infected web domains for more than 17 percent of its cloud-security customer base. The US is, predictably, the most affected, with the UK coming in second. There is a massive attack reported by Cisco, and they have a heatmap with the countries primarily targeted. Malicious advertisements on domains belonging to Disney, Facebook, The Guardian newspaper and many others are leading people to sites that are CryptoWall infected and encrypt their drives. This puppy comes with a nasty twist though, it no longer requires a user to open an infected attachment, but uses a fresh vulnerability in Java. The bad news is that the earlier vulnerability of CryptoDefense has been fixed and you can no longer yourself decrypt files that are encrypted by CryptoWall.
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IT security pundits speculated that either the criminals released a new version because CryptoDefense was being blocked by endpoint protection software, or that they sold their source code to another cyber mob. This strain is for the most part the same as CryptoDefense except another brand name, different filenames for the ransom instructions, and a whole new attack vector.
Late April, the cyber criminals who developed the CryptoDefense ransomware released a new variant called CryptoWall. There is a new ransomware strain called CryptoWall hitting organizations.
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