--- title: Microsoft Exchange Servers Targeted By Hackers description: Microsoft Exchange Servers Targeted By Hackers image: https://blog.securafy.com/hubfs/Imported_Blog_Media/microsoft-key-resized.png --- [Securafy Knowledge Hub](https://blog.securafy.com) - [Topics](https://blog.securafy.com/#sf-cover) - [Tools](https://blog.securafy.com/#sf-tools) - [Books & Guides](https://blog.securafy.com/#sf-books) [Talk to Securafy](https://meetings.hubspot.com/securafy/strategy-call) [Topics](https://blog.securafy.com/#sf-cover) [Tools](https://blog.securafy.com/#sf-tools) [Books & Guides](https://blog.securafy.com/#sf-books) [Talk to Securafy](https://meetings.hubspot.com/securafy/strategy-call) [Knowledge Hub](https://blog.securafy.com) / IT Operations IT Operations # Microsoft Exchange Servers Targeted By Hackers Microsoft Exchange Servers Targeted By Hackers ![Randy Hall](https://blog.securafy.com/hubfs/Randy%20Hall%202.png) By Randy Hall Updated Jul 2024 3 min read Share [**](https://www.linkedin.com/sharing/share-offsite/?url=https://blog.securafy.com/2022/05/13/microsoft-exchange-servers-targeted-by-hackers) [**](https://twitter.com/intent/tweet?url=https://blog.securafy.com/2022/05/13/microsoft-exchange-servers-targeted-by-hackers&text=%3Cspan+id%3D%22hs_cos_wrapper_name%22+class%3D%22hs_cos_wrapper+hs_cos_wrapper_meta_field+hs_cos_wrapper_type_text%22+style%3D%22%22+data-hs-cos-general-type%3D%22meta_field%22+data-hs-cos-type%3D%22text%22+%3EMicrosoft+Exchange+Servers+Targeted+By+Hackers%3C%2Fspan%3E) [**](mailto:?subject=%3Cspan+id%3D%22hs_cos_wrapper_name%22+class%3D%22hs_cos_wrapper+hs_cos_wrapper_meta_field+hs_cos_wrapper_type_text%22+style%3D%22%22+data-hs-cos-general-type%3D%22meta_field%22+data-hs-cos-type%3D%22text%22+%3EMicrosoft+Exchange+Servers+Targeted+By+Hackers%3C%2Fspan%3E&body=https://blog.securafy.com/2022/05/13/microsoft-exchange-servers-targeted-by-hackers) ![](https://blog.securafy.com/hs-fs/hubfs/Imported_Blog_Media/microsoft-key-resized.png?width=300&height=225&name=microsoft-key-resized.png)If you rely on a Microsoft Exchange server to handle email for your company, there is something you should be aware of. Recent research by security and analytics company Varonis has discovered that an affiliate of Hive ransomware has begun targeting Exchange servers that are vulnerable to ProxyShell security issues. If the group in question finds a vulnerable server, they'll install a variety of backdoors including Cobalt Strike beacon. That allows them to come back later and snoop around in your network for anything of value, steal administrator account credentials, make off with your company's proprietary data, or encrypt your files and demand payment from you to get them back. The exploited flaws are being tracked as CVE-2021-34473, CVE-2021-34523, and CVE-2021-31297. All 3 range in severity from 7.2 (high) to 9.8 (critical). This group is hardly unique in exploiting these flaws.  They've been used by other hacker groups including Cuba, Babuk, BlackByte, Conti, and others.  The fact that the exploits seem to be growing in popularity among the hacking community is the most troubling aspect of the recent discovery. Hive has been around since at least June of last year (2021) and the group has evolved considerably since they first appeared. That prompted the FBI to release a report detailing their activities and tactics to better prepare IT professionals for attacks the group might make against their organizations. In October 2021, the Hive gang added Linus and Free BSD variants to their growing bank of tricks and they became one of the most active ransomware operations as measured by the frequency of their attacks. Just last month, researchers operating out of Sentinel Labs discovered that the group is utilizing a new obfuscation technique in a bid to better mask the malicious payloads they introduce to infected networks. All of this points to the fact that the Hive group is actively working to improve the efficiency and effectiveness of their attacks.  Stay vigilant and be on the alert for this group.  They've got a well deserved reputation for being dangerous. Tagged Under IT Operations[Cybersecurity](https://blog.securafy.com/tag/cybersecurity)Business Continuity In This Article Need Help With Your Current Setup? Talk through your current systems, risks, and support gaps with Securafy. [Book a Strategy Call](https://meetings.hubspot.com/securafy/strategy-call) ## Join The Conversation Have a question or perspective on this topic? Add it below. ![Randy Hall](https://blog.securafy.com/hubfs/Randy%20Hall%202.png) About The Author Randy Hall · CEO & Founder Randy Hall is the CEO and Founder of Securafy, with decades of experience helping organizations make smarter, safer decisions about technology. A frequent speaker and instructor at national IT events, Randy has advised thousands of organizations, from startups and SMBs to large enterprises and U.S. government entities, on secure, practical technology adoption. He writes about the decisions business leaders are often expected to make without enough context, including cybersecurity, compliance, AI, cyber insurance, IT strategy, and business resilience. Outside the office, you’ll often find Randy on Lake Erie enjoying time on his 38-foot Chris-Craft. **Writes about:** Cybersecurity strategy, compliance, AI security, business resilience, cyber insurance, SMB risk, IT leadership [More From This Author →](https://blog.securafy.com/author/randyhall) Related Articles Business Continuity [Compliance Risk Assessment: How Downtime Impacts Your Bottom Line](https://blog.securafy.com/compliance-risk-assessment-how-downtime-impacts-your-bottom-line) When systems go down, compliance obligations don't pause—and the financial consequences ... Jul 28, 2026 Compliance [HIPAA Security Rule Changes Are Delayed To 2027: Why Healthcare Organizations Should Not Wait](https://blog.securafy.com/hipaa-security-rule-changes-are-delayed-to-2027-why-healthcare-organizations-should-not-wait) The updated HIPAA Security Rule won't take effect until 2027, but healthcare ... 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