Author: xopero_blogger

Welcome to the next episode of the Xopero Security Center. This week we are taking a break from MS Exchange and ProxyLogon vulnerabilities. Maybe except this small update: according to Microsoft, 92% of vulnerable Exchange servers are now patched or mitigated. But Microsoft’s ecosystems are profitable targets and attackers take advantage of newer vulnerabilities to infect systems over and over again. Thus, this time we are taking a closer look into an upgraded variant of Purple Fox malware with worm capabilities that targets Microsoft Windows machines. Which one exactly? To find out more, read the full post.

Welcome to the next episode of the Xopero Security Center. Race against time – that’s the best description of the ProxyLogon situation. First Microsoft has released emergency patches for vulnerable systems. No more than a week later researchers spotted the first ransomware actively exploiting these vulnerabilities. Now users got a one-click ProxyLogon mitigation tool (details below). The keyword is „mitigation” – it mitigates the risk of exploit until the update will be applied. This is not an alternative. The good news – tens of thousands of Microsoft Exchange servers have been patched already. Experts have never seen patch rates this high for any system before. Still, there are about 82k devices vulnerable to the attack. Hence the new tool. Need to find out more? Check the rest of the article.

Welcome to the next episode of the Xopero Security Center. This time we are taking a closer look into the Z0Miner malware case – a new threat against unpatched ElasticSearch and Jenkins servers. MS Exchange servers are under attack too. Remember the four new zero-day vulnerabilities discovered a few weeks ago? They have got a fancy name now – ProxyLogon exploits – and very effective [DearCry] ransomware which is targeting vulnerable devices. What’s next? There is also a novel phishing attack that uses fake Google reCAPTCHA to swipe Microsoft 365 credentials. There were also some problems with the GitHub logging mechanism. Details can be found below.

Microsoft is pressing customers to install emergency patches as soon as possible. So far, there is only one highly skilled hacker group actively exploiting the vulnerabilities – named Hafnium – but the situation could change at any time. The best protection against this attack will be applying new patches now, not tomorrow or one week from today. More information about MS Exchange zero-days can be found below.

After multiple proof-of-concept exploit scripts of VMware RCE new bug were published on GitHub, hackers started mass scanning for vulnerable Internet-exposed servers. The company patched the critical vulnerability already, but thousands of unpatched vCenter servers are still reachable over the Internet. This is a serious problem. It does look like this is the last moment for a safe update. More information about vCenter vulnerability can be found below.

MassLogger malware has come back in a new variant which is much more powerful than the old spyware that has attacked the Windows platform for years. (Brand)New and better? Yes. We are dealing with a Trojan horse that tries to steal usernames and passwords from Microsoft Outlook, the Thunderbird email client, and password managers built into Google Chrome, Mozilla Firefox, Microsoft Edge and other browsers. Have you got any suspicious-looking email? Better never open it. Want to find out more about MassLogger? Check the article below for more information.

A novel supply chain attack, called dependency confusion or a substitution attack, takes advantage of the open ecosystem that many businesses use as part of their app development process. And given that business apps have become increasingly important, any threat to the app development supply chain could potentially have huge implications. Found this short intro interesting? Then click and read the whole new episode of the Xopero Security Center.