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WannaCry was a disaster that could have been prevented if people took notice. If you didn’t hear about it you must have been asleep, here is a refresher. After WannaCry, most businesses took notice and updated their operating systems, patched them and took measures to avoid a further outbreak. But today, May 14th, 2019, Microsoft has released information that warns of yet another WannaCry-like worm. Note: If you are using Windows 10, you are OK, you are not vulnerable to this CVE. If not, and if you are still on Windows 7 then start upgrading to Windows 10 by using the Inplace Upgrade Task Sequence I explain about here or if you cannot upgrade immediately, then patch Windows 7 to protect it from this vulnerability. Vulnerable in-support systems include Windows 7, Windows Server 2008 R2, and Windows Server 2008. Downloads for in-support versions of Windows can be found in the Microsoft Security Update Guide. Customers who use an in-support version of Windows and have automatic updates enabled are automatically protected. Out-of-support systems include Windows 2003 and Windows XP. If you are on an out-of-support version, the best way to address this vulnerability is to upgrade to the latest version of Windows. Even so, we are making fixes available for these out-of-support versions of Windows in KB4500705. If however you are running Windows XP, yes…. that old unsupported operating system then take warning ! Today, Microsoft has warned against the wormable capabilities from this CVE (critical Remote Code Execution vulnerability) and they blogged about what to do to avoid it happening to you. Read that blog post here: https://blogs.technet.microsoft.com/msrc/2019/05/14/prevent-a-worm-by-updating-remote-desktop-services-cve-2019-0708/ It’s very clear from their text that this is all about protecting customers from the next worm, so pay attention and if you have old operating systems that are in support and affected, then update immediately. Note: This is so serious that even Windows XP and Windows Server 2003 are getting updates from Microsoft for this vulnerability. You can download those updates from Microsoft Catalog here. https://support.microsoft.com/en-ca/help/4500705/customer-guidance-for-cve-2019-0708
The return of EternalBlue On June 27th 2017, another RansomWare attack took hold targeting the same eternal blue (SMBv1) vulnerabilities as WannaCry before it. This attack however doesn't reach out to the internet like WannaCry did, it's an internal network attack. However, this attack seems to have deliberately targeted businesses in Ukraine, and as the email address used for encryption keys was disabled almost immediately, there's no point in anyone paying ransom if their files are encrypted as they'd never get a reply (with the decryption info). Patch Patch Patch If you haven't done it already (and if you have not, why not especially after WannaCry), head over to this Technet link and apply the patches, do it. Stopping the damage That said, a security researcher found a way of stopping the ransomware from encrypting machines affected by placing a read-only file called Perfc in the Windows directory, eg: C:\Windows\Perfc The presence of that file will be enough to stop the contents of the hard disc from being encrypted by this malware, however the reason this malware spread in the first place is down to vulnerabilities (unpatched) in the operating system. Those vulnerabilities include two from the leaked NSA exploits, so if you've patched your operating systems against those known vulnerabilities you should be safe. Protection against this new ransomware attack Microsoft have advised the following to keep you protected against this (and similar) RansomWare attacks: "We recommend customers that have not yet installed security update MS17-010 to do so as soon as possible. Until you can apply the patch, we also recommend two possible workarounds to reduce the attack surface: Disable SMBv1 with the steps documented at Microsoft Knowledge Base Article 2696547 and as recommended previously Consider adding a rule on your router or firewall to block incoming SMB traffic on port 445 As the threat targets ports 139 and 445, you customers can block any traffic on those ports to prevent propagation either into or out of machines in the network. You can also disable remote WMI and file sharing. These may have large impacts on the capability of your network, but may be suggested for a very short time period while you assess the impact and apply definition updates. Windows Defender Antivirus detects this threat as Ransom:Win32/Petya as of the 18.104.22.168 update. Windows Defender Antivirus uses cloud-based protection, helping to protect you from the latest threats. For enterprises, use Device Guard to lock down devices and provide kernel-level virtualization-based security, allowing only trusted applications to run, effectively preventing malware from running. Monitor networks with Windows Defender Advanced Threat Protection, which alerts security operations teams about suspicious activities. Download this playbook to see how you can leverage Windows Defender ATP to detect, investigate, and mitigate ransomware in networks: Windows Defender Advanced Threat Protection – Ransomware response playbook." Recommended Reading https://technet.microsoft.com/en-us/library/security/ms17-010.aspx?utm_campaign=windows-noob.com https://www.theregister.co.uk/2017/06/28/petya_notpetya_ransomware/ https://blogs.technet.microsoft.com/mmpc/2017/06/27/new-ransomware-old-techniques-petya-adds-worm-capabilities/ https://www.binarydefense.com/petya-ransomware-without-fluff/ http://blog.coretech.dk/swo/petya-ransomware-the-attack-method-and-preventing-it/ https://azure.microsoft.com/en-us/blog/petya-ransomware-prevention-detection-in-azure-security-center/ https://www.welivesecurity.com/2017/06/30/telebots-back-supply-chain-attacks-against-ukraine/ http://blog.uk.fujitsu.com/information-security/petya-medoc-and-the-delivery-of-malicious-software/#.WVeKWCmxXD4 https://www.1e.com/blogs/2017/06/30/stop-future-petya-attacks/?utm_content=56869130&utm_medium=social&utm_source=windows-noob.com