Security News
Microsoft has pushed out a new update for their Microsoft Safety Scanner tool to detect web shells deployed in the recent Exchange Server attacks. On March 2nd, Microsoft disclosed that four Exchange Server zero-day vulnerabilities were being used in attacks against exposed Outlook on the web servers.
Exchange Servers targeted via zero-day exploits, have yours been hit?Microsoft has released out-of-band security updates for seven bugs affecting Microsoft Exchange Servers, four of which are zero-day vulnerabilities being exploited by attackers in the wild to plunder on-premises machines. March 2021 Patch Tuesday forecast: Off to an early startMicrosoft got an early start on Patch Tuesday, releasing a series of out-of-band security updates for actively exploited bugs in Exchange Server.
Microsoft has released a PowerShell script that admins can use to check whether the recently disclosed ProxyLogon vulnerabilities have hacked a Microsoft Exchange server. On March 2nd, Microsoft released out-of-band emergency security updates to fix four zero-day vulnerabilities actively used in attacks against Microsoft Exchange.
Microsoft on Friday released alternative mitigation measures for organizations who have not been able to immediately apply emergency out-of-band patches released earlier this week that address vulnerabilities being exploited to siphon e-mail data from corporate Microsoft Exchange servers. "These mitigations are not a remediation if your Exchange servers have already been compromised, nor are they full protection against attack," Microsoft warned in a blog post.
A new ransomware called 'Hog' encrypts users' devices and only decrypts them if they join the developer's Discord server. This week, security researcher MalwareHunterTeam found an in-development decryptor for the Hog Ransomware that requires victims to join their Discord server to decrypt their files.
"CISA has determined that this exploitation of Microsoft Exchange on-premises products poses an unacceptable risk to Federal Civilian Executive Branch agencies and requires emergency action," reads the March 3 alert. "With organizations migrating to Microsoft Office 365 en masse over the last few years, it's easy to forget that on-premises Exchange servers are still in service," Saryu Nayyar, CEO, Gurucul, said via email.
The Department of Homeland Security's cybersecurity unit has ordered federal agencies to urgently update or disconnect Microsoft Exchange on-premises products on their networks. CISA "Strongly" recommended federal agencies to examine their networks to detect malicious activity related to zero-day attacks targeting Exchange servers.
Security researchers warn that multiple cyber-espionage groups are targeting the recently addressed zero-day vulnerabilities in Microsoft Exchange Server and say that more than 300 web shells have been identified on the compromised servers. Managed detection and response solutions provider Huntress says it has already observed more than 200 compromised Exchange Servers that received payloads within the "C:inetpubwwwrootaspnet clientsystem web" directory, and claims to have identified more than 350 web shells to date.
InVue introduces RAC Lock - a simple, scalable, and secure solution for data centers in need of visibility and control to their server racks. For data centers securing personal and business data, implementing robust protocols for both cyber and physical security is paramount, but not without its challenges.
Multiple state-sponsored hacking groups are actively exploiting critical Exchange bugs Microsoft patched Tuesday via emergency out-of-band security updates. Advanced persistent threat groups are currently using "At least" the CVE-2021-26855 Microsoft Exchange Server vulnerability as part of ongoing attacks to achieve remote code execution without authentication on unpatched on-premises Exchange servers.