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This particular client had the following security features in place which were all beaten: When we first heard of CryptoLocker we took a range of steps to reduce all of our client’s chances of being infected.
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This was the most worrying aspect for us. Did the machines not have any protection? How did the threat get on the system in the first place? Had we not had a solid regular back-up, the files would likely have been lost forever. The infection had encrypted around 4,000 documents on the server, and had removed any ability to view ‘volume shadow copies’ (previous file versions) so we had to restore all the infected files from the previous night’s back-up. Had we not have had the Untangle appliance in place, we’d have had to spend hours checking each computer to see which was harboring the infection – which would have been very costly in terms of lost productivity for the client. The infected machine was kept offline, and was then cleaned up without being re-connected to the company network. The total down-time suffered by the client was around 45 minutes for all the machines except the infected machine which had to stay switched off. At this point, we kept an eye on the server to ensure no more files were being encrypted. Once we knew which system was infected, we brought all the other machines back online. We inspected the file that was downloaded and discovered it was called something similar to track_141944.zip – a clear indication that this was in fact a virus (CryptoLocker is often delivered by spam e-mails claiming to have a tracking number for you, or an invoice). We quickly saw a batch of strange downloading activity that had started around 30 minutes earlier, from one particular computer to an odd Russian web address. We then looked at the scan events log, which showed any downloaded files (infected or clean) for the computers. The first thing we did was to look at the virus/quarantine section to see if anything had been picked up – which it hadn’t been. Untangle is a fantastic firewall, which includes anti-virus scanning and internet filtering. Our next step was to investigate the Untangle server which we’d installed for our client at the beginning of the year. With this in mind, we were pretty sure that the CryptoLocker infection must have been delivered via a web download.
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We knew from experience that the likely way into the network was via e-mails, and 6 months ago when these threats first appeared we locked down all of our clients with Office 365 e-mail hosting to reject any executable e-mail attachments (including zip files with executable contents). Due to the way CryptoLocker works, it was unlikely to be more than a single machine in the company that actually hosted the virus, and this machine would be accessing all the shared drives and trying to encrypt the files. Once we had the systems offline, we needed to identify which computer(s) had been infected with the virus. Although this put the client out of action for a short period, it was a crucial first step as the CryptoLocker virus will work to encrypt any files it can find so shutting everything down made the recovery quicker by stopping the virus in it’s tracks.
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Hopefully this will help other IT professionals in managing a similar crisis, and business owners should pay attention to our end recommendations on how to avoid this kind of nightmare scenario! Swift actions can save files!įirstly, upon hearing the words ‘encrypted files’, Tom’s first action was to get the client to shut down their computers – all of them – and their server. The tale below explains what we did, what we found, and the key learnings from this infection. Luckily our technicians are well versed in this nasty infection, and despite having never seen it infect any of our clients, we managed to take a number of steps to avert a serious crisis. If you’re not aware of CryptoLocker and how nasty it can be, we wrote a blog about it when it first appeared on the scene. encrypted extensions” exclaimed the staff member, and our technician Tom’s face dropped as he realised our worst nightmare – one of our clients has been hit by CryptoLocker. Last Friday we had a call from one of our larger clients who were having issues opening up some documents on their computer.