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PSA: Zepto ransomware is not stopped by Bitdefender AR, Malwarebytes AE

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#1 NathanWarawa


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Posted 23 September 2016 - 05:05 PM

Just had a client get hit with the Zepto ransomware. It was a "PDF" attachment in an email that delivered the payload. Both Bitdefender AntiRansomware and Malwarebytes AntiExploit did not stop it, despite it being a variant of Locky.


It's worse than Locky, in that all encrypted files are also renamed. This caused a problem trying to roll back the office-wide "Onedrive for Business" share. All previous versions of the files were wiped, and replaced with only 2, with the same time stamp. Restoring back to version "1.0" gave the same modified name and extension, but thankfully, DID reverse the encryption. I had to manually assign an extension based on best guess from file size, though, and there is no way to do a mass rollback in the web gui, so I asked for Microsoft's help. Microsoft was planning a full site roll-back, but it was going to take a few days... that was too much downtime, and I had a local cached copy on one of the machines with a "Previous Versions" only a day old.  I made sure that copy was clean, backed up the entire encrypted share (in case a decryption tool becomes available), and resync'd up the share. Once again, backup saves the day... but worthy of note that OneDrive's versioning system in not enough to save your bacon here (and this is one of the reasons I moved to a OneDrive share in the first place!)


Anyone have any suggestions for AntiRansomware moving forward? Malwarebytes AntiRansomware interfered with some software I used last time a tried it (sorry, can't remember which), and the aforementioned 2 I had in place obviously were insufficient. 



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#2 quietman7


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Posted 24 September 2016 - 03:25 AM

For the best defensive strategy to protect yourself from malware and ransomware (crypto malware) infections, see my comments (Post #2) in this topic...Ransomware avoidance.

There is an ongoing discussion in this topic where you can ask questions and seek further assistance. Other victims have been directed there to share information, experiences and suggestions.When or if a solution is found, that information will be provided in this support topic and you will receive notification if subscribed to it. In addition, a news article most likely will be posted on the BleepingComputer front page.

Rather than have everyone with individual topics, it would be best (and more manageable for staff) if you posted any more questions, comments or requests for assistance in the above support topic discussion...it includes experiences by experts, a variety of IT consultants, end users and company reps who have been affected by ransomware infections. To avoid unnecessary confusion, this topic is closed.

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